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The hydrolytic hydrogenation of cellulose to sorbitol over M (Ru, Ir, Pd, Rh)-BEA-zeolite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54736 47024 2014 7 PDF Available
Title
The hydrolytic hydrogenation of cellulose to sorbitol over M (Ru, Ir, Pd, Rh)-BEA-zeolite catalysts
Abstract

•Supported Ir, Pd, Rh and Ru catalysts were examined for the synthesis of sorbitol.•Ru-BEA was found to be the most active for the conversion of cellulose.•The high activity of Ru was assigned to the generation of Brønsted sites in water.•Ir-BEA was found to be the most selective for the formation of sorbitol.•The high selectivity of Ir was correlated with the d-band width of the metal.

Supported Ir, Pd, Rh and Ru catalysts were examined for the conversion of glucose and cellulose in water in the presence of hydrogen. The catalysts were prepared by incipient wetness impregnation of a BEA zeolite (SiO2/Al2O3 = 21.6, Ssp = 739 m2/g) with acetylacetonate metal precursors. Among these catalysts, Ru-BEA was found to be the most active for the conversion of cellulose, while Ir-BEA was found to be the most selective for the formation of sorbitol. Thus, the highest yield to sorbitol was found in the presence of 3 wt%Ru/BEA catalyst irrespective of the raw material nature (glucose or cellulose). It corresponded to a value of 22% for the conversion of the commercial cellulose, and of 72.8% for the conversion of glucose. The Ru-BEA catalyst was followed by the 3 wt%Ir-BEA that led to a yield of 55.3% for glucose and 22% for cellulose but to a much higher selectivity, i.e. over 99.9% for glucose and 89.2% for cellulose. While the high selectivity of Ir to sorbitol was correlated with the d-band width of the metal, the high activity of Ru for the cellulose conversion was assigned to the generation of H+ and [Ru(H2O)5OH]2+ as Brønsted acids by Ru species in water. Finally, the addition of pure nanoscopic hydroxylated SnF4 to the 3 wt%Ir-BEA catalyst led to a conversion of cellulose of almost 99% after only 3 h with a selectivity to sorbitol of 72.5%.

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Keywords
Cellulose; Hydrogenation; Sorbitol; Ruthenium; Iridium; BEA zeolite
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The hydrolytic hydrogenation of cellulose to sorbitol over M (Ru, Ir, Pd, Rh)-BEA-zeolite catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 223, 15 March 2014, Pages 122–128
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us