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Production of fuel-cell grade hydrogen by sorption enhanced water gas shift reaction using Pd/Ni–Co catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45966 46427 2014 11 PDF Available
Title
Production of fuel-cell grade hydrogen by sorption enhanced water gas shift reaction using Pd/Ni–Co catalysts
Abstract

•Pd/Ni–Co catalyst and CaO based sorbent have been studied for sorption enhanced water gas shift reaction.•Fuel cell grade hydrogen was achieved in one-step water gas shift reaction with in-situ CO2 capture.•Improved resistance to methanation reaction was found by using 30%Ni–10%Co catalyst.•CaCeZr mix oxide sorbent was evaluated for enhanced capture capacity and better stability than dolomite.

It has been demonstrated both thermodynamically and experimentally that fuel-cell grade hydrogen can be produced by a one-step sorption enhanced water gas shift (SEWGS) process at about 500 °C, where the water gas shift (WGS) catalyst and the CO2 sorbent are highly integrated. A synthetic CaO-based mixed oxide sorbent was also assessed, which showed a good CO2 capture capacity and stability in the cyclic operation of the SEWGS reaction. Catalysts play a significant role in CO conversion via WGS, methanation and methane steam reforming reactions. A Pd promoted Ni–Co catalyst (1%Pd/20%Ni–20%Co) derived from hydrotalcite-like material (HT) showed a high activity for WGS and methane steam reforming. The methanation activity was further reduced on 30%Ni–10%Co. There exists an optimum temperature (500 °C) for hydrogen production by the SEWGS process, where it is kinetically limited by the WGS reaction at lower temperatures (425–475 °C) and it is thermodynamically unfavorable at higher temperatures (475–550 °C). The challenges for hydrogen production by SEWGS at high CO pressures were also demonstrated, where CO pressure has shown a negative influence on WGS activity. An induction period was observed, which can be reduced by improving catalyst activity and by adding hydrogen to the reactant mixture.

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Keywords
CO conversion; Fuel cells; Hydrogen; Pd/Ni–Co-hydrotalcite catalyst; Sorption enhanced water gas shift
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Production of fuel-cell grade hydrogen by sorption enhanced water gas shift reaction using Pd/Ni–Co catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 585–595
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