fulltext.study @t Gmail

Steam reforming of glycerol over Ni/Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55636 47060 2011 9 PDF Available
Title
Steam reforming of glycerol over Ni/Al2O3 catalyst
Abstract

Glycerol steam reforming has been investigated in a 10-mm ID fixed-bed reactor containing Ni/Al2O3 catalyst using a wide range of the steam-to-carbon ratio (1.1 ≤ STCR ≤ 4.0) at temperatures between 723 K and 823 K. Physicochemical characterization revealed that the catalyst surface was populated by both weak and strong acid and basic sites although the catalyst appeared to have a net surface acidity. H2, CO2 and CO were the main gaseous products with H2:CO2 ratio at approximately 2.15 while H2:CO ratio varied between 6.0 and 16.0 depending on the reactant feed composition. The specific glycerol consumption rate exhibited fractional reaction orders with respect to both glycerol (0.48) and steam (0.34) and activation energy of about 60 kJ mol−1. Mechanistic considerations indicated that glycerol and steam underwent associative and dissociative adsorption, respectively on two different sites with the surface reaction being the rate-determining step. Additionally, carbon deposition has a positive dependency on the glycerol partial pressure, but it was inhibited in the presence of steam.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (124 K)Download as PowerPoint slideHighlights► Glycerol reforming over Ni–alumina catalyst gave essentially stoichiometric H2:CO2 ratio of 2.17. ► H2, CO2 formation and glycerol consumption rates have similar activation energy of about 60 kJ mol−1. ► Rate data were adequately captured by a dual-site LH model with glycerol and steam chemisorption on different active sites. ► Carbon deposition was still significant although rate was inhibited by steam.

Keywords
Glycerol steam reforming; Hydrogen production; Kinetic analysis; Nickel catalyst
First Page Preview
Steam reforming of glycerol over Ni/Al2O3 catalyst
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
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 25–33
Authors
, , ,
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
Online Support
Any Questions? feel free to contact us