Magnetically separable base catalysts for isomerization of glucose to fructose

Yang, Qiang; Zhou, Shengfei; Runge, Troy

doi:10.1016/j.jcat.2015.08.008

Cited by 67 publications

(120 citation statements)

References 24 publications

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“…In this manuscript, we herein report a method for the synthesis of Fe 3 O 4 NPs supported hexamethylenetetramine (HMTA), which is rich in tertiary nitrogen content and ideal for loading Pd catalysts. Fe 3 O 4 @HMTA is a base catalyst similar to that developed for isomerisation of glucose to fructose . The prepared Fe 3 O 4 @HMTA‐(Pd(II)) and Fe 3 O 4 @HMTA‐(Pd 0 ) assemblies have been then studied for the commercially important Mizoroki‐Heck coupling reactions.…”

Section: Introductionmentioning

confidence: 92%

Palladium Acetate and Pd Nanoparticles Loaded Hexamethylenetetramine Anchored Magnetically Retrievable Assemblies for Catalyzing Mizoroki‐Heck Type Mono and Gem‐Dicoupling Reactions

Rathod

Kumar

et al. 2020

ChemistrySelect

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Fe3O4 nanoparticles have been covalently coated and chemically modified to anchor hexamethylenetetramine (Fe3O4@HMTA) for hosting Pd catalysts such as palladium acetate and palladium nanoparticles. Thus prepared nanocatalyst assemblies have been extensively characterized for their chemical, physical, thermal and magnetic properties. The turnover number and turnover frequency of these catalysts in a model Mizoroki‐Heck coupling reaction involving 3‐acrylomorpholine and iodobenzene with a base as solvent are found to be 186 and 46 h−1, respectively, which are better than that reported in literature. This was attributed to synergistic effect of local basic environment of HMTA rich in tertiary nitrogen content. Gem‐dicoupled products are formed when reactions are performed in the presence of 1 equivalent of acrylate and 2.1 equivalents of aryl iodide, and gem‐hetero‐dicoupled product is obtained when reaction is performed in sequential manner. The mechanisms of the formation of the gem‐homo‐dicoupled and gem‐hetero‐dicoupled products have been elucidated by using the results obtained from NMR and single crystal X‐ray crystallography studies.

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Section: Introductionmentioning

confidence: 92%

Palladium Acetate and Pd Nanoparticles Loaded Hexamethylenetetramine Anchored Magnetically Retrievable Assemblies for Catalyzing Mizoroki‐Heck Type Mono and Gem‐Dicoupling Reactions

Rathod

Kumar

et al. 2020

ChemistrySelect

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“…There are some studies where the simultaneous presence of small amounts of mannose was also found as a result of the isomerization . This is the case when using biphasic or acid / base catalyst for glucose isomerization, both capable of slightly isomerize it .…”

Section: La Production By Heterogeneous Reactionmentioning

confidence: 99%

“…The main drawback of using bases is the appearance of colored products due to the thermal decomposition of the carbohydrates. Unwanted bioproducts like organic acids, such as metasaccharinic acid, other colored substances of unknown nature, and small amounts of reducing substances can be generated by side reactions and deposited onto the catalyst surface, decreasing the catalytic activity …”

Section: La Production By Heterogeneous Reactionmentioning

confidence: 99%

“…200,203 There are some studies where the simultaneous presence of small amounts of mannose was also found as a result of the isomerization. 92,135,205,206 This is the case when using biphasic or acid / base catalyst for glucose isomerization, both capable of slightly isomerize it. 205,207,208 The main drawback of using bases is the appearance of colored products due to the thermal decomposition of the carbohydrates.…”

Section: Effects Of Temperature Ph Type Of Catalyst and Reaction Timementioning

confidence: 99%

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The challenge of converting biomass polysaccharides into levulinic acid through heterogeneous catalytic processes

Covinich

Clauser

Felissia

et al. 2019

Biofuels Bioprod Bioref

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The differences between a biorefinery and an oil refinery are determined by the higher oxygen content of the biorefinery's biomass, its high degree of functionalization, its low thermal stability, its polar components, which are mostly acidic, its highly heterogeneous structure, and its quality variation as result of genotypic and phenotypic characteristics. Levulinic acid (LA) is one of the main high value‐added chemicals that can be produced from lignocellulosic biomass as raw material. The main challenges for the conversion of lignocellulosic biomass to levulinic acid are related to the improvement of the technologies to obtain a pure and cost‐competitive product, the design and use of efficient heterogeneous catalysts, and the improvements in the selectivity and useful life of the catalyst. This is an up‐to‐date review of the state of knowledge about the heterogeneous catalytic conversion of biomass into LA, addressing the technical hurdles that impede the attainment of high yields. This work outlines the chemistry of LA synthesis and discusses in detail the influence of the lignocellulosic raw material, reaction time, temperature, solvent according to the chemical pathway, and efficiency of the chosen Lewis and Brønsted solid acid catalysts. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…Moreover, glucose and fructose are inclined to undergo side reactions under strong basic reaction media . In this context, searching for heterogeneous catalysts for glucose isomerization has attracted increasing interest in the past few years . Among the heterogeneous catalysts examined, hydrotalcites are very promising not only because of their abundant basic sites and adjustable pore structure but also their cheapness.…”

Section: Introductionmentioning

confidence: 99%

Isomerization Kinetics of Glucose to Fructose in Aqueous Solution with Magnesium‐Aluminum Hydrotalcites

Wang

Zhang

et al. 2020

ChemistrySelect

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Mg−Al hydrotalcites for catalyzing glucose isomerization to fructose are prepared. Effects of atom ratios of Mg/Al ranging from 1 to 4 and calcination temperatures from 250–650 °C on catalytic performance were examined systematically. It was found that the hydrotalcite (Mg2Al1LDH) calcined at 450 °C with an atom ratio of Mg/Al=2 is an excellent catalyst for glucose isomerization. Characterizations by SEM, EDS, TEM, XRD, FTIR, TG and BET demonstrated that the formed oxide condensed phase as well as the interaction with the alumina helps promote glucose isomerization reaction due to their appropriate basic sites at high calcination temperature. With Mg2Al1‐450 as the catalyst, kinetic model analysis confirmed that the reaction of glucose isomerization to fructose was an exothermal reversible reaction; both the forward and reverse reactions are quasi‐first‐order reactions with activation energies of 71.82 kJ/mol and 48.15 kJ/mol, respectively, while the side reaction is a zero‐order reaction with an activation energy of 94.22 kJ/mol. Therefore, high isomerization reaction temperature is not beneficial to enhance the yield and selectivity of fructose.

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Magnetically separable base catalysts for isomerization of glucose to fructose

Cited by 67 publications

References 24 publications

Palladium Acetate and Pd Nanoparticles Loaded Hexamethylenetetramine Anchored Magnetically Retrievable Assemblies for Catalyzing Mizoroki‐Heck Type Mono and Gem‐Dicoupling Reactions

Palladium Acetate and Pd Nanoparticles Loaded Hexamethylenetetramine Anchored Magnetically Retrievable Assemblies for Catalyzing Mizoroki‐Heck Type Mono and Gem‐Dicoupling Reactions

The challenge of converting biomass polysaccharides into levulinic acid through heterogeneous catalytic processes

Isomerization Kinetics of Glucose to Fructose in Aqueous Solution with Magnesium‐Aluminum Hydrotalcites

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