Journal
ACS CATALYSIS
Volume 6, Issue 5, Pages 2827-2830Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00659
Keywords
redox mechanism; formate mechanism; associative mechanism; HT-WGS; iron-based catalysts; hydrogen
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Funding
- National Science Foundation [CBET- 1511689]
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The reaction mechanism of the high-temperature water gas shift (HT-WGS) reaction catalyzed by chromium iron oxide catalysts for H-2 production has been studied for 100 years with two reaction mechanisms proposed: redox and associative (involving surface HCOO*). Direct experimental support for either mechanism, however, is still lacking, which hinders a thorough understanding of catalytic roles of each elements and the rational design of Cr-free catalysts. The current study demonstrates, with temperature-programmed surface reaction (TPSR) spectroscopy (CO-TPSR, CO+H2O-TPSR, and HCOOH-TPSR), for the first time that the HT-WGS reaction follows the redox mechanism and that the associative mechanism does not take place.
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