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Glucose To Fructose Isomerization

Zeolite-catalyzed Transformation Of Glucose: A Review

Zeolite-catalyzed Transformation Of Glucose: A Review

Zeolite-catalyzed Transformation of Glucose: A Review Author(s): Gang Yang* , College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China Xianli Zou . College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China Background: Isomerization of glucose to fructose is recognized as one of the key reactionsfor the transformation of cellulosic biomass, a potent substitution for the depleting petroleum resources.Zeolites are among the most useful catalysts for the isomerization process and substantial achievementshave been achieved thus far. A state-of-the-art review is given within this content, and catalytic mechanismsand competitive reactions are discussed as well. Methods: We performed a comprehensive search of literatures and the qualities of retrieved papers wereappraised using standard tools. Literatures that represent the substantial findings are highlighted reflectingthe progresses made with regard to the isomerization of glucose to fructose catalyzed by zeolites. Results: Substantial achievements have been made with regard to the zeolite-catalyzed isomerization ofglucose to fructose. The joint experimental-computational studies provide insightful clues to reactionmechanisms; e.g., the isomerization reaction proceeds in sequence of pyranose ring opening, hydrideshift from C2 to C1 (rate-decisive) and furanose ring closure while the epimerization reaction is characterizedby the intramolecular 1,2-carbon shift; Both of the defects SnOH and proximate silanol promotesignificantly the isomerization reaction while proximate silanol disfavors the epimerization reaction. Conclusion: On basis of the Continue reading >>

Ca1056750a - Glucose To Fructose Isomerization In The Presence Of Iron Salt - Google Patents

Ca1056750a - Glucose To Fructose Isomerization In The Presence Of Iron Salt - Google Patents

CA1056750A - Glucose to fructose isomerization in the presence of iron salt - Google Patents Glucose to fructose isomerization in the presence of iron salt CA1056750A CA 230003 CA230003A CA1056750A CA 1056750 A CA1056750 A CA 1056750A CA 230003 CA230003 CA 230003 CA 230003 A CA230003 A CA 230003A CA 1056750 A CA1056750 A CA 1056750A Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON C08BPOLYSACCHARIDES; DERIVATIVES THEREOF C08B37/00Preparation of polysaccharides not provided for in groups C08B1/00-C08B35/00; Derivatives thereof C08B37/0006Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid C08B37/0036Galactans; Derivatives thereof C08B37/0039Agar; Agarose, i.e. D-galactose, 3,6-anhydro-D-galactose, methylated, sulfated, e.g. from the red algae Gelidium and Gracilaria; Agaropectin; Derivatives thereof, e.g. Sepharose, i.e. crosslinked agarose C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA C12N11/00Carrier-boun

Ebscohost | 99890276 | Chemical Isomerization Of Glucose To Fructose Production.

Ebscohost | 99890276 | Chemical Isomerization Of Glucose To Fructose Production.

Chemical Isomerization of Glucose to Fructose Production. Source: Asian Journal of Chemistry . 2014, Vol. 26 Issue 15, p4537-4542. 6p. Author(s): SHUO ZHAO; XIANGHAI GUO; PENG BAI; LINGJUAN LV Abstract: Efficient chemical catalyst is becoming a research hotspot in isomerization of glucose to fructose, because the chemical catalyst rather than enzyme has a wider operating temperature range, a longer lifetime and a higher resistance to impurities. The most commonly used chemical catalysts for isomerization of glucose to fructose can be divided into five principal groups, such as homogeneous bases, heterogeneous bases, Lewis acids, aluminates and subcritical water. Thus, the focus of this review is mainly on isomerization of glucose to fructose by using chemical catalysts and mechanistic aspects of the isomerization reaction in order to gather maximum information in one manuscript for a better comprehension of the technological characteristics and specificities of fructose synthesis. Copyright of Asian Journal of Chemistry is the property of Asian Journal of Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. For access to this entire article and additional high quality information, please check with your college/university library, local public library, or affiliated institution. Important User Information: Remote access to EBSCO's databases is permitted to patrons of subscribing institutions accessing from remote locations Continue reading >>

Method For The Isomerization Of Glucose To Fructose - Tessonnier Jean-philippe

Method For The Isomerization Of Glucose To Fructose - Tessonnier Jean-philippe

METHOD FOR THE ISOMERIZATION OF GLUCOSE TO FRUCTOSE United States Patent Application 20170066793 In various embodiments, the present invention provides methods to isomerize glucose to fructose using abuse. In one embodiment, the method includes catalyzing isomerization of glucose to fructose including combining an effective catalytic amount of a base with glucose in an aqueous medium so that the glucose is isomerized to yield a mixture comprising fructose and glucose. SCHWEGMAN LUNDBERG & WOESSNER, P.A. (P.O. BOX 2938 MINNEAPOLIS MN 55402) 1. A method comprising: catalyzing isomerization of glucose to fructose comprising combining an effective catalytic amount of a base with glucose in an aqueous medium no that the glucose is isomerized to yield a mixture comprising fructose and glucose. 2. The method of claim 1, wherein the glucose is isomerized to the fructose with about 40-80% selectivity. 3. The method of claim 1, comprising heating the aqueous medium to about 50-150 C. 4. The method of claim 3, comprising heating the aqueous medium for up to about 30 minutes. 5. The method of claim 4, comprising heating the aqueous medium for about 2-10 minutes. 6. The method of claim 1, wherein during the isomerizing, the aqueous medium has an initial pH of about 9 to about 14. 7. The method of claim 1, wherein the mol-% ratio of the base to the glucose is about 5-20 mol-%. 8. The method of claim 1, further comprising isolating and converting the fructose to at least one of 5-hydroxymethylfurfural (FEW), 2,5-furandicarboxylic acid (FDCA), and levulinic acid. 9. The method of claim 1, further comprising treating the fructose with activated carbon to remove colored impurities. 10. The method of claim 1, further comprising adjusting pH to about 4-10 to substantially eliminate yellow Continue reading >>

Wo2015171368a1 - Method For The Isomerization Of Glucose To Fructose - Google Patents

Wo2015171368a1 - Method For The Isomerization Of Glucose To Fructose - Google Patents

WO2015171368A1 - Method for the isomerization of glucose to fructose - Google Patents Method for the isomerization of glucose to fructose WO2015171368A1 PCT/US2015/028059 US2015028059W WO2015171368A1 WO 2015171368 A1 WO2015171368 A1 WO 2015171368A1 US 2015028059 W US2015028059 W US 2015028059W WO 2015171368 A1 WO2015171368 A1 WO 2015171368A1 Iowa State University Research Foundation, Inc. Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS C07H3/00Compounds containing only hydrogen atoms and saccharide radicals having only carbon, hydrogen, and oxygen atoms C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS C07H1/00Processes for the preparation of sugar derivatives C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS C07H1/00Processes for the preparation of sugar derivatives C13KSACCHARIDES, OTHER THAN SUCROSE, OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DI-, OLIGO- OR POLYSACCHARIDES PCT/US2015/028059 2014-05-06 2015-04-28 Method for the isomerization of glucose to fructose WO2015171368A1 (en) Method for the isomerization of glucose to fructose Method for the isomerization of glucose to fructose WO2015171368A1 true true WO2015171368A1 (en) Method for the isomerization of glucose to fructose * Cited by examiner, Cited by third party THE GOVERNMENT OF THE UNITED STATES OF AMERICA as represented by the Secretary Department of Commerce * Cited by examiner, Cited by third party THE GOVERNMENT OF THE UNITED STATES OF AMERICA as represented by the Secretary Department of Commerce * Cited by examiner,

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%PDF-1.3%5 0 obj<>streamxYw%q&iB EQ\$QR1V?7+AbI&*~Swk{~, o7)C MN}nrc O&c,o;6_+#IPdqH! o|'G'k _OoN d}WB Q{>7[xkHKyE-.]|6b,RY-?m_{/o$A?FotKZ/@rb:\1*=nS_l=^dS"7I#ebAChpP QcFmiG56 ^|~ X \n%:& { s \<_?=<7 nnA(^|9ZO BX+\6%>[j1P{{|8|,in'c}8s/CoB 1+Awuxtz:> x_>?W}'kOX =`xsqp/`o>4nOI [email protected]EYRiuIx}:= @|"A~1ak]xs}u{|tp=s*J |1wd_OSJ8 a25\l4\@DjnG@G tAq 0 p8M( Z"60}t+ %! NFr}2d`L> nnwxgx jz qnS:^sTmW8WPR ZV 1 7b8&;?z\Ds.>||;]?,p` %2,zAp r.BG;> k>UKO?x^($q O+bQ7@OB =)Zpsml(CW q"&77O_f>.1)!`*jgE:R= |\O #`wcBo"FP1Hd"-- =c( > }~yz8L]Ac%a)x+z)xpwWz|mEz!l{|:=>* lrA#lx )yn]M6)* !t ^j5d Mgmz~aA6|>)5SB,=%ZMW7)(P&LFV-B! [email protected],)r>] 6(:eyy+< E81ia%X% ib-Jw4xvi~\gzC*L|?g'3t!w:mOE+q%)R; 6c4zDps0b1EP>wpm)sSKW/M?DFRaOqz(z5Ag[^wfgq=xY70#Xy?;=s}f~x,7> 29rUWw{TV>sqa "z/&N M}?7zwza$YVi*:nn2?(VHg7zx3>Ogxx -J4"&pW=^_z5 n|!e\] S! 72O2NhA.8Q 6{ISq%HAUe^v_[@&]E.2E[K#R[a{9q\qbYDByi? nX|W7D4"2Nal)$\/[email protected]F G7'NyOl6.*]X,m>C 97nWQ'[email protected]_)`-O[sl{3]3)`EpV_vL_DGU.9;]. [$aS(ZT 0J+D>ZuBcM/}tY_G5[_TON8*b$E^/8^8QeTBEGod6q6BMf2E8M,*<<<~qh! p lN\b374Add_Zp"J,}^Zr+wWYpu:j2~ J &L/xEx7#EiBH[n-) [email protected]=g6g^ 8pQK({s) 6zpv:sKN&k2DlgQ$['/d]F~Hs6Z}^Y_XHSQ4 t7foaN n>=|~:<>>` 50[1;jHB3#ky]\ %mkvAF6d =\w ? xSmdJ, sV3dsdSa XL/Kabq>C]PL[6m 5.L7|E*f*=oi1SfWo/grsklP "8Cj!"D1I47" [y2%D\-S+Q|.e$HWN1wqqbJ> _a %_?Sh!`.J;nIN7R?Zj aO}</@|#d|~bDZ*c"W./Im51iG~;or Continue reading >>

Glucose To Fructose Isomerization Over Solid Oxide Catalysts

Glucose To Fructose Isomerization Over Solid Oxide Catalysts

@article{360cda26ce89452a9d18da15f2a34283, title = "Glucose to fructose isomerization over solid oxide catalysts", abstract = "High yield routes for biomass to commodity chemicals and fuels via HMF or levulenic acid have been developed for fructose, other sugars, and polyols, but overall yields remain low starting from glucose. Isomerization of glucose to fructose is one route to improving yields, but immobilized enzymes may be impractical for commodity chemicals and fuels, and dilute acids can lead to mass loss as humins. Recently, large pore Ti- and Sn-substituted zeolites have been reported to convert glucose to fructose or methyl lactate. In this study, we describe glucose to fructose isomerization over solid Bronsted and Lewis acid oxide catalysts. Results show a small population of active, but unselective isomerization sites, and titrating away such sites with metal halides moderate catalyst reactivity. Isomerizations are run in water or methanol, 100-160C, in glass batch reactors, and analysis by GC or HPLC. Catalyst characterization includes TEM, TGA, DRUV-vis, and N2 physisorption.", author = "Canlas, {Christian P.} and Notestein, {Justin M.}", Research output: Contribution to journal Article T1 - Glucose to fructose isomerization over solid oxide catalysts N2 - High yield routes for biomass to commodity chemicals and fuels via HMF or levulenic acid have been developed for fructose, other sugars, and polyols, but overall yields remain low starting from glucose. Isomerization of glucose to fructose is one route to improving yields, but immobilized enzymes may be impractical for commodity chemicals and fuels, and dilute acids can lead to mass loss as humins. Recently, large pore Ti- and Sn-substituted zeolites have been reported to convert glucose to fructose or Continue reading >>

Isomerization Of Glucose Into Fructose By Environmentally Friendly Fe/ Zeolite Catalysts.

Isomerization Of Glucose Into Fructose By Environmentally Friendly Fe/ Zeolite Catalysts.

Isomerization of glucose into fructose by environmentally friendly Fe/ zeolite catalysts. Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China. Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China. Electronic address: [email protected] Carbohydr Res. 2017 Jun 29;446-447:48-51. doi: 10.1016/j.carres.2017.05.006. Epub 2017 May 10. Herein, the environmentally friendly Fe/ zeolite for glucose isomerization to fructose in aqueous media was reported for the first time. The effects of various reaction conditions including reaction temperature, reaction time, catalyst dosage, etc. on the isomerization reaction over Fe/ zeolite were studied in detail. Under the optimized conditions, yield of fructose higher than 20% were obtained. Moreover, the Fe/ zeolite catalysts were stable and remained constant catalytic activity after five consecutive runs. The possible active Fe species for isomerization of glucose in Fe/ zeolite is also discussed. Continue reading >>

Isomerization Of Glucose To Fructose Catalyzed By Lithium Bromide In Water

Isomerization Of Glucose To Fructose Catalyzed By Lithium Bromide In Water

Isomerization of glucose to fructose catalyzed by lithium bromide in water This study demonstrated that glucose could be isomerized to fructose in the concentrated aqueous solution of lithium bromide (LiBr) under mild conditions. The isomerization mechanisms were studied via isotopic labeling experiments. It was found that both the cation (Li ) in the system catalyzed the isomerization of glucose to fructose. Br catalyzed the isomerization through the proton transfer mechanism via an enediol intermediate, while Li did it through an intramolecular hydride shift mechanism from C2 to C1. The estimation using quantitative catalyzed approximately 85% of the isomerization, while Li was responsible for the remaining 15%. The results indicated that 31% of the fructose was produced from glucose in LiBr trihydrate at 120 C for 15 min. The outcomes of this study provided not only a better understanding of and insights into the sugar transformations in the LiBr solution but also an alternative approach to produce fructose from glucose. The article was received on 15 Jul 2017, accepted on 03 Aug 2017and first published on 03 Aug 2017 Isomerization of glucose to fructose catalyzed by lithium bromide in water C. G. Yoo, N. Li, M. Swannell and X. Pan, Green Chem., 2017,19, 4402 If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using RightsLink. Go to our Instructions for using RightsLink page for details. Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. Reproduced material s Continue reading >>

Active Sites In Sn-beta For Glucose Isomerization To Fructose And Epimerization To Mannose

Active Sites In Sn-beta For Glucose Isomerization To Fructose And Epimerization To Mannose

Active Sites in Sn-Beta for Glucose Isomerization to Fructose and Epimerization to Mannose Bermejo-Deval, Ricardo and Orazov, Marat and Gounder, Rajamani and Hwang, Son-Jong and Davis, Mark E. (2014) Active Sites in Sn-Beta for Glucose Isomerization to Fructose and Epimerization to Mannose. ACS Catalysis, 4 (7). pp. 2288-2297. ISSN 2155-5435. Use this Persistent URL to link to this item: Framework Lewis acidic tin sites in hydrophobic, pure-silica molecular sieves with the zeolite beta topology (Sn-Beta) have been reported previously to predominantly catalyze glucosefructose isomerization via 1,2 intramolecular hydride shift in water and glucosemannose epimerization via 1,2 intramolecular carbon shift in methanol. Here, we show that alkali-free Sn-Beta predominantly isomerizes glucose to fructose via 1,2 intramolecular hydride shift in both water and methanol. Increasing extents of postsynthetic Na+ exchange onto Sn-Beta, however, progressively shifts the reaction pathway toward glucosemannose epimerization via 1,2 intramolecular carbon shift. Na^+ remains exchanged onto silanol groups proximal to Sn centers during reaction in methanol solvent, leading to nearly exclusive selectivity toward epimerization. In contrast, decationation occurs with increasing reaction time in aqueous solvent and gradually shifts the reaction selectivity to isomerization at the expense of epimerization. Decationation and the concomitant selectivity changes are mitigated by the addition of NaCl to the aqueous reaction solution. Preadsorption of ammonia onto Sn-Beta leads to near complete suppression of infrared and ^(119)Sn nuclear magnetic resonance spectroscopic signatures attributed to open Sn sites and of glucosefructose isomerization pathways in water and methanol. These data provide evi Continue reading >>

A Periodic Dft Study Of Glucose To Fructose Isomerization On

A Periodic Dft Study Of Glucose To Fructose Isomerization On

A Periodic DFT Study of Glucose to Fructose Isomerization on May 23, 2016 - A Periodic DFT Study of Glucose to Fructose Isomerization on Tungstite (WO3H2O): Influence of Group IVVI Dopants and Cooperativity... Hydrothermal Carbonization of Glucose, Fructose, and Xylose Jun 14, 2017 - The monosaccharides glucose, fructose, and xylose were subjected to hydrothermal carbonization in aqueous solution at temperatures of 180, 220, and 250 C for different operating times (30 min to 16 h). Here, 68% to 78% of the organic Surface: A Periodic DFT Study on the Role of C ... - ACS Publications Aug 18, 2017 - Mo2C catalysts are widely used in hydrogenation reactions; however, the role of the C and Mo terminations in these catalysts is not clear. Understanding the binding of adsorbates is key for explaining the activity of Mo2C. The adsorpti b Universit de Lyon, Laboratoire de Chimie, Ecole Normale Suprieure de Lyon and ... 15 parvis Ren Descartes - BP 7000, 69342 Lyon Cedex 07, France. Subscriber access provided by UCL Library Services A periodic DFT study of glucose to fructose isomerization on tungstite (WO3H2O): influence of group IVVI dopants and cooperativity with hydroxyl groups Guanna Li, Evgeny A Pidko, and Emiel J. M. Hensen ACS Catal., Just Accepted Manuscript DOI: 10.1021/acscatal.6b00869 Publication Date (Web): 23 May 2016 Downloaded from on May 28, 2016 Just Accepted Just Accepted manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides Just Accepted as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. Just Accepted manuscripts appear in full i Continue reading >>

The Isomerization Of D-glucose Into D-fructose In Aqueous Alkaline Solutions

The Isomerization Of D-glucose Into D-fructose In Aqueous Alkaline Solutions

Volume 54, Issue 1 , March 1977, Pages 33-44 The isomerization of d-glucose into d-fructose in aqueous alkaline solutions Author links open overlay panel C.Kooyman K.Vellenga Get rights and content To relate kinetic data of previous publications about the isomerization of d-glucose into d-fructose in aqueous, alkaline media in the temperature range 2271, a simple kinetic model has been developed, which allows transformation of the rate constants published. The kinetic model has been based on the generally accepted enolate-ion isomerization mechanism, and comprises rate constants that are independent of the hydroxyl-ion concentration. The relationship between the hydroxyl ion-dependent and -independent rate constants is given. Given the reliability boundaries, it appears from the transformed literature data that the hydroxyl ion-independent rate constants of the forward and reverse reaction are about the same. The validity of the model at higher temperatures (67104) has been confirmed. From an Arrhenius plot, it has been deduced that the apparent activation-energy, related to the hydroxyl ion-independent rate constants, of the forward and reverse reaction is , 121 kJ. mol1. Continue reading >>

Facile Isomerization Of Glucose Into Fructose Using Anion-exchange Resins In Organic Solvents And Application To Direct Conversion Of Glucose Into Furan Compounds

Facile Isomerization Of Glucose Into Fructose Using Anion-exchange Resins In Organic Solvents And Application To Direct Conversion Of Glucose Into Furan Compounds

, Volume 43, Issue10 , pp 54955506 | Cite as Facile isomerization of glucose into fructose using anion-exchange resins in organic solvents and application to direct conversion of glucose into furan compounds The facile isomerization of glucose into fructose has been developed using commercially available anion-exchange resins (AERs) in organic solvents. Following extensive screening for the amount and type of AERs, solvents and reaction time, glucose was transformed into fructose in yields of up to 50% using Amberlite A-26 with macroreticular morphology and tertiary amine functionality in a protic solvent (ethanol). AERs could be used five times without a significant loss of activity. This isomerization method could be applied to the direct conversion of glucose into furan compounds by integrating the dehydration of fructose with cation-exchange resins. IsomerizationGlucoseFructoseAnion-exchange resinsOrganic solventsDirect conversion This is a preview of subscription content, log in to check access. We would like to acknowledge the financial support from the R&D Convergence Program of NST (National Research Council of Science and Technology) of the Republic of Korea and KITECH (Korea Institute of Industrial Technology) and from the Internal Research Program (PEO17250) of KITECH. A.L. Marshall, P.J. Alaimo, Chem. Eur. J. 16, 4970 (2010) CrossRef Google Scholar L.D. Schmidt, P.J. Dauenhauer, Nature 447, 914 (2007) CrossRef Google Scholar M.J. Climent, A. Corma, S. Iborra, Green Chem. 13, 520 (2011) CrossRef Google Scholar F.W. Lichtenthaler, S. Mondel, Pure Appl. Chem. 69, 1853 (1997) CrossRef Google Scholar S. Pedersen, Bioprocess Technol. 16, 185 (1993) Google Scholar H.B. Zhao, J.E. Holladay, H. Brown, Z.C. Zhang, Science 316, 1597 (2007) CrossRef Google Scholar A. T Continue reading >>

Glucose Isomerization Into Fructose Catalyzed By Mgo/nay Catalyst

Glucose Isomerization Into Fructose Catalyzed By Mgo/nay Catalyst

Bing Li, Lu-wei Li, Ying-nan Dong, Qing Zhang, Wei-zheng Weng, Hui-lin Wan. Glucose Isomerization into Fructose Catalyzed by MgO/NaY Catalyst[J]. Chinese Journal of Polar Since, 2018, 31(2): 203-210. , , , , , . MgO/NaY[J]. , 2018, 31(2): 203-210. Glucose Isomerization into Fructose Catalyzed by MgO/NaY Catalyst Bing Lia,b, Lu-wei Lia, Ying-nan Dongb, Qing Zhanga Dated: Received on September 30, 2017; Accepted on May 7, 2017 a. Anhui Laboratory of Molecule-Based Materials(State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China; b. College of Energy and Power, Shenyang Institute of Engineering, Shenyang 110136, China; c. State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China *Author to whom correspondence should be addressed. Qing Zhang, E-mail: [email protected] Abstract: The MgO/NaY catalysts prepared by impregnation method were used for the conversion of glucose to fructose in water medium.The effects of MgO loading, reaction temperature, glucose concentration and reaction time on the catalytic performance for the reaction were studied.The activity testing results indicated that fructose could be generated effectively by controlling the components of the catalyst and reaction conditions.The maximal fructose yield of 33.8% with the selectivity of 67.3% was achieved over the 10% MgO/NaY catalyst at 100 for 2 h.Moreover, the catalysts were characterized by XRD, BET, and CO2-TPD techniques.The structural property of NaY with higher surface area facilitated glucose conversion, and the modulated basicity of the catalyst with MgO addition contributed to the formation of fructose in the tautomerization of aldose to ketose. Key words: Glucose Fructose I Continue reading >>

Ak Lectures - Isomerization Of D-glucose Into D-fructose

Ak Lectures - Isomerization Of D-glucose Into D-fructose

Isomerization of D-Glucose into D-Fructose As we discussed previously, under basic conditions, D-glucose can be transformed into D-mannose. But it can also be transformed into D-fructose. This isomerization reaction involves the deprotonation of the alpha-hydrogen of D-glucose to produce an enolate intermediate. The enolate can then go on to form a double enol. The double enol can be deprotonated on one of the hydrogen groups to form carbonyl group. A final reprotonated step on the anionic carbon can lead to the final product, the D-fructose. Note that D-glucose is an aldohexose while the D-fructose is a ketohexose. This implies that in this reaction, an aldehyde group is transformed into a ketone group. [{"id":"CyvpoSRMp_c","title":"Mutarotation of Carbohydrates","link":"http:\/\/www.aklectures.com\/lecture\/mutarotation-of-carbohydrates"},{"id":"BKhbDcjuN2g","title":"Base Isomerization of Carbohydrates","link":"http:\/\/www.aklectures.com\/lecture\/base-isomerization-of-carbohydrates"},{"id":"in4sSVDq5bk","title":"Isomerization of D-Glucose into D-Fructose","link":"http:\/\/www.aklectures.com\/lecture\/isomerization-of-d-glucose-into-d-fructose"},{"id":"zBEzJyNXVT4","title":"Reducing Sugars","link":"http:\/\/www.aklectures.com\/lecture\/reducing-sugars"},{"id":"t3RDrmb-iGY","title":"Oxidation of Carbohydrates","link":"http:\/\/www.aklectures.com\/lecture\/oxidation-of-carbohydrates"},{"id":"2QNtCOcwrnM","title":"Oxidative Cleavage of Carbohydrates","link":"http:\/\/www.aklectures.com\/lecture\/oxidative-cleavage-of-carbohydrates"},{"id":"FFga7xYc81o","title":"Formation of Glycoside","link":"http:\/\/www.aklectures.com\/lecture\/formation-of-glycoside"},{"id":"EPdR8IGuUsA","title":"Osazone Formation from D-Glucose","link":"http:\/\/www.aklectures.com\/lecture\/osazone Continue reading >>

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