Reaction Rates for the Partial Dehydration of Glucose to Organic Acids in Solid-Acid, Molecular-Sieving Catalyst Powders

Abstract

Molecular‐sieving catalysts have the potential to promote the production of oxygenated hydrocarbons from glucose. A kinetic model for the partial dehydration of glucose to organic acids by micro‐ and mesoporous aluminosilicate catalysts was developed. Kinetic parameters were estimated from glucose conversion and product yield versus time data at 150°C for HY‐zeolite, aluminum‐pillared montmorillonite, MCM‐20 and MCM‐41 catalyst powders of 0·5 mmol H+ g−1 solid‐acid activity. Rate constants for the partial dehydration of glucose to 5‐hydroxymethylfurfural (HMF) and the rehydration and cleavage of HMF to formic acid and 4‐oxopentanoic acid were maximized at catalyst pore diameters of 10–30 Å. The final organic acid product yields were low, less than 60% of theoretical for formic acid and 10% of theoretical for 4‐oxopentanoic acid, due to significant coke formation. © 1997 SCI.

Dehydration of glucose to levulinic acid over MFI-type zeolite in subcritical water at moderate conditions

“…It can serve in the dehydration of glucose [7][8][9]. Moreover, to promote the conversion of glucose, several solid acids including ion-exchange resins [10], solid phosphates [11][12][13], metal oxides [14,15], and zeolites [16][17][18][19][20][21] From current studies, zeolites show a potential use in glucose dehydration and it is found that the pore structure has a significant influence on the reaction [16][17][18][19][20]22]. Thus, in this work, we employed a novel MFI-type zeolite, denoted as ZRP, in the glucose dehydration reaction.…”

“…However, the highest yield of LA is obtained on ZRP-30, not on ZRP-25. The highest yield of LA is 35.8%, which is higher than the value obtained on other zeolites [16][17][18][19]. Formic acid, which is formed coupling with LA from HMF, has a Dehydration of glucose to levulinic acid 379 higher yield than that of LA.…”

Aromatic Production from Catalytic Fast Pyrolysis of Biomass-Derived Feedstocks

“…These thermally stable oxygenates are intermediates in the production of aromatics. The furan compounds are formed from acid catalyzed dehydration of carbohydrates [24]. The acid catalyst can be both the heterogeneous solid acid and the homogenous organic acid products.…”

Green Chemicals from d-glucose: Systematic Studies on Catalytic Effects of Inorganic Salts on the Chemo-Selectivity and Yield in Aqueous Solutions

“…It is well possible that the salt promotes the isomerisation of D-glucose to D-mannose and D-fructose. This isomerisation reaction is well known to be catalysed by solids (cation ion exchange resins, hydrotalcites and metal oxides such as ZrO 2 and TiO 2 ) and involves an 1,2-enediol as the intermediate [10,[22][23][24]. The D-fructose and D-mannose formed in the isomerisation reaction are not inert and also known to react to, among others, HMF and levulinic acid [1].…”

“…A wide variety of Bronsted acid catalysts have been tested for these conversions. Examples are homogeneous catalysts like sulfuric acid, hydrochloric acid, phosphoric acid, trifluoroacetic acid [3,8,9] and solid acid catalysts like acidic ion exchange resins, zeolites and montmorillonites [10].…”