Transformation of Sugars Using Nanoporous Acidic Catalysts

Saravanamurugan, Shunmugavel; Riisager, Anders; Taarning, Esben

doi:10.1002/9783527699827.ch25

Cited by 1 publication

(1 citation statement)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In accordancew ith this analysis, the highest yields of xylulose were obtained with H-USY( 6), which had ar atio of medium (type 1, T desorb = 100-270 8C) to strong (type 2, T desorb = 270-500 8C) acid sites of 1:0.81 and with H-Beta (12.5) at ar atio of 1:0.52. [20,26,27] Above or below the mentioned acids ite ratios, or for zeolites with al ower number of total acid sites, al ower yield of xylulose was obtained (Table S3 in the Supporting Information).…”

Section: Effect Of Zeolite Aciditymentioning

confidence: 99%

Xylose Isomerization with Zeolites in a Two‐Step Alcohol–Water Process

et al. 2015

Self Cite

View full text Add to dashboard Cite

Isomerization of xylose to xylulose was efficiently catalyzed by large-pore zeolites in a two-step methanol-water process that enhanced the product yield significantly. The reaction pathway involves xylose isomerization to xylulose, which, in part, subsequently reacts with methanol to form methyl xyluloside (step 1) followed by hydrolysis after water addition to form additional xylulose (step 2). NMR spectroscopy studies performed with (13) C-labeled xylose confirmed the proposed reaction pathway. The most active catalyst examined was zeolite Y, which proved more active than zeolite beta, ZSM-5, and mordenite. The yield of xylulose obtained over H-USY (Si/Al=6) after 1 h of reaction at 100 °C was 39%. After water hydrolysis in the second reaction step, the yield increased to 47%. Results obtained from pyridine adsorption studies confirm that H-USY (6) is a catalyst that combines Brønsted and Lewis acid sites, and isomerizes xylose in alcohol media to form xylulose at low temperature. The applied zeolites are commercially available; do not contain any auxiliary tetravalent metals, for example, tin, titanium, or zirconium; isomerize xylose efficiently; are easy to regenerate; and are prone to recycling.

show abstract

Section: Effect Of Zeolite Aciditymentioning

confidence: 99%