TY - JOUR
T1 - Design of full-temperature-range RWGS catalysts: impact of alkali promoters on Ni/CeO 2
AU - Gandara-Loe, Jesus
AU - Zhang, Qi
AU - Villora-Picó, J.J.
AU - Sepúlveda-Escribano, Antonio
AU - Pastor-Pérez, Laura
AU - Ramirez Reina, Tomas
PY - 2022/5/25
Y1 - 2022/5/25
N2 - Reverse water gas shift (RWGS) competes with methanation as adirect pathway in the CO2 recycling route, with methanation being a dominantprocess in the low-temperature window and RWGS at higher temperatures. Thiswork showcases the design of multi-component catalysts for a full-temperature-range RWGS behavior by suppressing the methanation reaction at lowtemperatures. The addition of alkali promoters (Na, K, and Cs) to thereference Ni/CeO2 catalyst allows identifying a clear trend in RWGS activationpromotion in both low- and high-temperature ranges. Our characterization dataevidence changes in the electronic, structural, and textural properties of thereference catalyst when promoted with selected dopants. Such modifications arecrucial to displaying an advanced RWGS performance. Among the studiedpromoters, Cs leads to a more substantial impact on the catalytic activity.Beyond the improved CO selectivity, our best performing catalyst maintainshigh conversion levels for long-term runs in cyclable temperature ranges, showcasing the versatility of this catalyst for differentoperating conditions. All in all, this work provides an illustrative example of the impact of promoters on fine-tuning the selectivity ofa CO2 conversion process, opening new opportunities for CO2 utilization strategies enabled by multi-component catalysts.
AB - Reverse water gas shift (RWGS) competes with methanation as adirect pathway in the CO2 recycling route, with methanation being a dominantprocess in the low-temperature window and RWGS at higher temperatures. Thiswork showcases the design of multi-component catalysts for a full-temperature-range RWGS behavior by suppressing the methanation reaction at lowtemperatures. The addition of alkali promoters (Na, K, and Cs) to thereference Ni/CeO2 catalyst allows identifying a clear trend in RWGS activationpromotion in both low- and high-temperature ranges. Our characterization dataevidence changes in the electronic, structural, and textural properties of thereference catalyst when promoted with selected dopants. Such modifications arecrucial to displaying an advanced RWGS performance. Among the studiedpromoters, Cs leads to a more substantial impact on the catalytic activity.Beyond the improved CO selectivity, our best performing catalyst maintainshigh conversion levels for long-term runs in cyclable temperature ranges, showcasing the versatility of this catalyst for differentoperating conditions. All in all, this work provides an illustrative example of the impact of promoters on fine-tuning the selectivity ofa CO2 conversion process, opening new opportunities for CO2 utilization strategies enabled by multi-component catalysts.
U2 - 10.1021/acs.energyfuels.2c00784
DO - 10.1021/acs.energyfuels.2c00784
M3 - Article
SN - 0887-0624
VL - 36
SP - 6362
EP - 6373
JO - Energy and Fuels
JF - Energy and Fuels
ER -