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Updated: Oct 11, 2025
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
K-Promoted Ni-Based Catalysts for Gas-Phase CO2 Conversion: Catalysts Design and Process Modelling Validation
J Gandara-Loe1, E Portillo2, J A Odriozola1,3
1Department of Inorganic Chemistry and Materials Sciences Institute, University of Seville-CSIC, Seville, Spain.
Potassium addition to Ni/CeO2 catalysts enhances carbon monoxide selectivity for the reverse water gas shift (RWGS) reaction, offering a promising route for CO2 conversion despite a slight decrease in CO2 conversion.
Area of Science:
- Catalysis
- Environmental Chemistry
- Chemical Engineering
Background:
- Rising greenhouse gas emissions necessitate CO2 capture and conversion strategies.
- The reverse water gas shift (RWGS) reaction converts CO2 into syngas, a key intermediate for valuable chemicals.
- Nickel-based catalysts are cost-effective alternatives to noble metals for RWGS but suffer from deactivation.
Purpose of the Study:
- To investigate the impact of potassium (K) promotion on Ni/CeO2 catalysts for low-temperature RWGS.
- To optimize K:Ni ratios for improved catalytic performance and stability.
- To understand K-Ni-support interactions influencing RWGS activity and selectivity.
Main Methods:
- Synthesis of Ni-based catalysts with varying K:Ni ratios (0.5:10, 1:10, 2:10).
- Comprehensive physicochemical characterization of synthesized catalysts.
- Evaluation of catalytic performance in the RWGS reaction under low-temperature conditions.
- Thermodynamic process modeling for comparison with experimental results.
Main Results:
- Potassium addition modified surface characteristics of Ni/CeO2 catalysts.
- Improved CO selectivity at lower temperatures was observed due to K-Ni-support interactions.
- A decrease in CO2 conversion and suppression of CO2 methanation were noted with K addition.
- The 1K catalyst demonstrated an optimal balance between CO2 conversion, methanation suppression, and CO selectivity.
Conclusions:
- Potassium promotion is effective in enhancing CO selectivity for Ni/CeO2 catalysts in low-temperature RWGS.
- The 1K catalyst offers a promising compromise for efficient CO2 conversion and syngas production.
- Experimental findings align well with thermodynamic modeling, validating the catalyst design for industrial applications.
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