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Glycerol liquid phase conversion over monometallic and bimetallic catalysts: Effect of metal, support type and reaction temperatures

Paper ID Volume ID Publish Year Pages File Format Full-Text
47048 46457 2011 11 PDF Available
Title
Glycerol liquid phase conversion over monometallic and bimetallic catalysts: Effect of metal, support type and reaction temperatures
Abstract

Glycerol liquid conversion under catalytic aqueous steam reforming conditions was studied. For this purpose monometallic Ni and Pt and bimetallic PtNi catalysts supported on γ-Al2O3 and La2O3-modified γ-Al2O3 were employed. Activity measurements indicated that among the tested catalysts, the PtNi catalysts were, in general, the most active, whereas the Ni catalysts suffered from increasing deactivation as the temperature increased. In addition, glycerol conversion was mainly due to the production of intermediate oxygenated hydrocarbons at the reaction conditions investigated. In general, the presence of La2O3 improved this catalytic behaviour toward lighter gaseous products. The characterisation results, together with the activity results, suggested that the high activity of the PtNi catalysts can be associated with limited metal dispersion, the formation of metal Pt–Ni alloy and the spill-over phenomenon. The last two effects hindered carbon deposition. Furthermore, the deactivation of the Ni catalysts was also associated with the oxidation of metallic Ni phases in the presence of adsorbed H2O.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Conversion was due to the formation of intermediate liquid oxygenated hydrocarbons at different temperatures. ► Among the liquid oxygenated hydrocarbons, 1,2-propylene glycol was the main product. ► Bimetallic catalysts showed good catalytic activity related with low dispersion of metallic active sites, Pt–Ni alloy formation and H2 spill-over. ► La2O3 addition improved the H2 yield by increasing Ni0 dispersion in Ni/γ-AM catalyst and surface exposure of Ni in PtNi/γ-AM catalyst. ► Ni catalysts deactivation observed was due to oxidation by water.

Keywords
Glycerol; Liquid; Reforming; Monometallic; Bimetallic
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Glycerol liquid phase conversion over monometallic and bimetallic catalysts: Effect of metal, support type and reaction temperatures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 1–2, 21 July 2011, Pages 83–93
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