Design of Full-Temperature-Range RWGS Catalysts: Impact of Alkali
Promoters on Ni/CeO2


Reverse water gas shift (RWGS) competes with methanation as a direct pathway in the CO2 recycling route, with methanation being a dominant process in the low-temperature window and RWGS at higher temperatures. This work showcases the design of multi-component catalysts for a full-temperature-range RWGS behavior by suppressing the methanation reaction at low temperatures. The addition of alkali promoters (Na, K, and Cs) to the reference Ni/CeO2 catalyst allows identifying a clear trend in RWGS activation promotion in both low- and high-temperature ranges. Our characterization data evidence changes in the electronic, structural, and textural properties of the reference catalyst when promoted with selected dopants. Such modifications are crucial to displaying an advanced RWGS performance. Among the studied promoters, Cs leads to a more substantial impact on the catalytic activity. Beyond the improved CO selectivity, our best performing catalyst maintains high conversion levels for long-term runs in cyclable temperature ranges, showcasing the versatility of this catalyst for different operating conditions. All in all, this work provides an illustrative example of the impact of promoters on fine-tuning the selectivity of a CO2 conversion process, opening new opportunities for CO2 utilization strategies enabled by multi-component catalysts.

(A) In situ XRD patterns under H2 or inert atmosphere (N2) of the catalysts up to 600 °C or 700 °C. (B) XRD patterns of spent catalysts. Symbols: ♥ MoxC ♣ MoOxCy, ♦ MoO2, x Mo, ♠ Cu, Φ CuO.

Paper information


Energy Fuels 2022, 36, 12, 6362–6373


Jesus Gandara-Loe
Qi Zhang
 Juan José Villora-Picó
Antonio Sepúlveda-Escribano
Laura Pastor-Pérez
Tomas Ramirez Reina


Alkali metals
Catalytic activity