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Aqueous phase reforming of glycerol for hydrogen production over Pt–Re supported on carbon

Paper ID Volume ID Publish Year Pages File Format Full-Text
47228 46464 2010 8 PDF Available
Title
Aqueous phase reforming of glycerol for hydrogen production over Pt–Re supported on carbon
Abstract

Hydrogen production from the aqueous phase reforming of glycerol over 3%Pt–Re/C (1 and 3% Re) has been studied in the absence and presence of base, and the results compared with a Re-free 3%Pt/C catalyst. Although the Pt/C catalyst is very selective toward the production of hydrogen, catalytic activity is low. Addition of Re significantly increases the conversion of glycerol, at some loss of hydrogen selectivity to light hydrocarbons and water-soluble oxygenates. Addition of 1%KOH to the feedstock results in a small increase in glycerol conversion with 3%Pt–3%Re/C, an increase in the gas phase product selectivity in terms of H2/CO2 ratio, and an increase in production of aqueous phase oxygenates. A modest increase in hydrogen gas phase selectivity with base addition with 3%Pt–3%Re/C arises primarily from reducing the selectivity toward C2+ alkanes, products that consume H2. In comparison, KOH addition to the glycerol feed with the Re-free 3%Pt/C catalyst provides an increase in glycerol conversion but results in a decline in both H2 and alkane selectivity relative to aqueous phase oxygenates. The highest hydrogen productivity among the catalysts tested is achieved with a 3%Pt–3%Re/C catalyst with added KOH base. The observed product distributions can be understood in terms of the different reaction pathways that become emphasized depending on catalyst composition and pH.

Research highlights▶ Addition of Re to Pt/C catalyst increases APR activity and hydrogen productivity. ▶ Addition of Re to Pt/C catalyst shows lower hydrogen selectivity. ▶ Side reactions generating products other than H2 and CO2 likely acid-catalyzed. ▶ Base addition results in higher hydrogen productivity with Pt–Re/C catalyst.

Keywords
Glycerol; Aqueous phase reforming; APR; Hydrogen production; Platinum–rhenium catalyst; KOH base addition; Reaction pathway
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Aqueous phase reforming of glycerol for hydrogen production over Pt–Re supported on carbon
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 206–213
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
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us