NDLI: Deactivation, Regeneration, and Stable Performance of a PtMoRe Water Gas Shift Catalyst for On-Site Hydrogen Generation: Part 2

Content Provider	Springer Nature Link
Author	Dorazio, Lucas Ruettinger, Wolfgang Castaldi, Marco J. Farrauto, Robert
Copyright Year	2008
Abstract	This paper analyzes the mechanism of deactivation and methods of regeneration of a PtMoRe water gas shift catalyst supported on a stabilized zirconia. Although this catalyst initially possesses high activity below 250 °C, a decrease in CO conversion ranging from 10 to 50% was observed over a period of 60 h. To determine the mechanism responsible for the decay, a series of activity tests and high resolution transmission electron microscopy analyses were done. Experimental results revealed the existence of stable and unstable operating regimes that depend on the reaction temperature, CO concentration, and H$_{2}$O/H$_{2}$. The high initial activity of this catalyst relies upon a synergetic relationship between the platinum, molybdenum, and rhenium which form an alloy generating the catalytically active phase. Based on our experimental results, we have concluded water contained in the feed gas oxidizes the Mo/Re metals, disrupts this synergy (de-alloys), and deactivates the catalyst. While not completely understood, CO is required for this oxidation mechanism to occur and possible explanations are discussed. Heating the catalyst in a hydrogen or reformate gas reduces the oxides back to metals, reforms the PtMoRe alloy, and restores the activity of the catalyst. Conditions for stable performance are consistent with use as a mid-temperature range water gas shift catalyst for on-site hydrogen generation.
Starting Page	68
Ending Page	75
Page Count	8
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	51
Issue Number	1-4
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2008-10-31
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water gas shift catalyst PtMoRe alloy Deactivation Regeneration H$_{2}$O/H$_{2}$ Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Pharmacy Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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