Journal
ACS CATALYSIS
Volume 12, Issue 6, Pages 3346-3356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c05582
Keywords
CO2 hydrogenation; Ni-based catalyst; electronic interaction; Ni-Zn alloy; reaction pathway
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Funding
- National Natural Science Foundation of China [22178265]
- Tianjin Key Science and Technology Project [19ZXNCGX00030]
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This study examines the interrelation between active sites and reaction pathways in Ni-catalyzed CO2 hydrogenation, and finds that charged active sites modify the selectivity of the reaction, providing guidance for catalyst design.
Controlling the selectivity of CO2 hydrogenation by catalysis is a fundamental challenge. This study examines the interrelation between active sites and reaction pathways in Ni-catalyzed CO2 hydrogenation. The alloying of Ni with Zn to charged (Ni sigma--Zn-sigma(+)) active sites modifies the electronic structure and d-band center, weakens the interaction with CO/H-2, and preferentially catalyzes the reverse water gas shift to CO with the thermodynamically favored methanation pathway switched off. The charged dual sites can stabilize the activated CO2 species in a eta(2)(C, 0) bridge configuration, directly dissociate the C=0 bond to *CO, and promote CO desorption. The mechanistic investigation has elucidated the reaction pathways in the Ni-catalyzed CO2 hydrogenation and identified the crucial intermediates that impacted the product selectivity, which can provide a theoretical guide for the Ni-based catalyst design.
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