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Title: Tuning Ni-catalyzed CO2 hydrogenation selectivity via Ni-ceria support interactions and Ni-Fe bimetallic formation

Journal Article · · Applied Catalysis B: Environmental
 [1];  [1];  [2];  [2];  [3]
  1. Columbia Univ., New York, NY (United States). Department of Chemical Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Department
  3. Columbia Univ., New York, NY (United States). Department of Chemical Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Department

CO2 hydrogenation over Fe-modified Ni/CeO2 catalysts was investigated in a batch reactor using time-resolved in situ FTIR spectroscopy. Low loading of Ni/CeO2 was associated with high selectivity to CO over CH4, while higher Ni loading improved CO2 hydrogenation activity with a reduced CO selectivity. X-ray absorption near-edge structure (XANES) analysis revealed Ni to be metallic for all catalysts including the CO-selective low loading 0.5% Ni catalyst, suggesting that the selectivity trend is due to structural rather than oxidation state effects. The loading amount of 1.5% Ni was selected for co-impregnation with Fe, based on the significant shift in product selectivity towards CH4 for that loading amount, in order to shift the selectivity towards CO while maintaining high activity. Temperature programmed reduction (TPR) results indicated bimetallic interactions between Ni and Fe, and XANES analysis showed that about 70% of Fe in the bimetallic catalysts was oxidized. The Ni-Fe catalysts demonstrated improved selectivity towards CO without significantly compromising activity, coupling the high activity of Ni catalysts and the high CO selectivity of Fe. The general trends in Ni loading and bimetallic modification should guide efforts to develop non-precious metal catalysts for the selective production of CO by CO2 hydrogenation.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1430879
Alternate ID(s):
OSTI ID: 1549473
Report Number(s):
BNL-203438-2018-JAAM
Journal Information:
Applied Catalysis B: Environmental, Vol. 224, Issue C; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 96 works
Citation information provided by
Web of Science

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