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A detailed kinetic model for biogas steam reforming on Ni and catalyst deactivation due to sulfur poisoning

Paper ID Volume ID Publish Year Pages File Format Full-Text
39908 45839 2014 8 PDF Available
Title
A detailed kinetic model for biogas steam reforming on Ni and catalyst deactivation due to sulfur poisoning
Abstract

•Detailed kinetic model for biogas reforming.•Kinetic model can predict catalyst deactivation in the presence of H2S.•1D fixed bed reactor modeling.•Comparison of model predictions with experimental data for biogas free from H2S.•Comparison of model predictions with experimental data for biogas containing 20–100 ppm H2S.

This paper deals with the development and validation of a detailed kinetic model for steam reforming of biogas with and without H2S. The model has 68 reactions among 8 gasphase species and 18 surface adsorbed species including the catalytic surface. The activation energies for various reactions are calculated based on unity bond index-quadratic exponential potential (UBI-QEP) method. The whole mechanism is made thermodynamically consistent by using a previously published algorithm. Sensitivity analysis is carried out to understand the influence of reaction parameters on surface coverage of sulfur. The parameters describing sticking and desorption reactions of H2S are the most sensitive ones for the formation of adsorbed sulfur. The mechanism is validated in the temperature range of 873–1200 K for biogas free from H2S and 973–1173 K for biogas containing 20–108 ppm H2S. The model predicts that during the initial stages of poisoning sulfur coverages are high near the reactor inlet; however, as the reaction proceeds further sulfur coverages increase towards the reactor exit. In the absence of sulfur, CO and elemental hydrogen are the dominant surface adsorbed species. High temperature operation can significantly mitigate sulfur adsorption and hence the saturation sulfur coverages are lower compared to low temperature operation. Low temperature operation can lead to full deactivation of the catalyst. The model predicts saturation coverages that are comparable to experimental observation.

Graphical abstractComparison between the model predicted product composition during catalyst deactivation and experimental observations made at 973 K for 20 ppm H2S in the feed.Figure optionsDownload full-size imageDownload high-quality image (149 K)Download as PowerPoint slide

Keywords
Biogas; Reforming; Catalyst poisoning; Kinetics; Deactivation; Modeling
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A detailed kinetic model for biogas steam reforming on Ni and catalyst deactivation due to sulfur poisoning
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 471, 10 February 2014, Pages 118–125
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
Online Support
Any Questions? feel free to contact us