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Updated: Jul 8, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
K-guided selective regulation mechanism for CO2 hydrogenation over Ni/CeO2 catalyst
Yunhao Zang1, Ziyi Zhang1, Jiangying Qu1
1Dongguan Key Laboratory of Low-Carbon Recycling and Utilization, School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, PR China.
Potassium modification of Ni/CeO2 catalysts significantly enhances carbon monoxide (CO) selectivity in CO2 hydrogenation by strengthening key intermediate adsorption. This method offers a novel approach to controlling product distribution in catalytic processes.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Controlling product selectivity in CO2 hydrogenation to CO and CH4 is a significant challenge.
- Potassium modification has been previously shown to influence selectivity by altering intermediate adsorption strengths.
Purpose of the Study:
- To propose and investigate a potassium-guided method for controlling CO2 hydrogenation selectivity.
- To elucidate the role of potassium in regulating key intermediates (HCO*/H3CO*) on Ni/CeO2 catalysts.
Main Methods:
- Synthesis and characterization of Ni catalysts supported on reducible ceria (CeO2), with and without potassium (K) modification.
- Evaluation of catalytic performance in CO2 hydrogenation, focusing on product selectivity (CO vs. CH4) and conversion.
- Analysis of reaction mechanisms, particularly the adsorption behavior of key intermediates (HCO*/H3CO*) influenced by K.
Main Results:
- Potassium modification dramatically increased CO selectivity from 25.4% to 93.8% for Ni/CeO2-K.
- K enhances the adsorption strength of HCO*/H3CO* intermediates, suppressing the pathway to CH4 and favoring CO formation.
- CO2 conversion decreased moderately from 55.2% to 48.6% due to reduced reducible Ni species and oxygen vacancies.
Conclusions:
- Potassium modification provides an effective strategy for tuning CO2 hydrogenation selectivity towards CO.
- The mechanism involves enhanced adsorption of key intermediates (HCO*/H3CO*), redirecting the reaction pathway.
- While CO2 conversion is slightly reduced, the selectivity enhancement offers significant advantages for CO production.
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