期刊
CHEMICAL ENGINEERING JOURNAL
卷 451, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138661
关键词
Non -thermal plasma; Plasma catalysis; CO2 conversion; Cobalt catalyst; Kinetics; Methane
This study compared CO2 hydrogenation under thermal-catalytic and plasma-catalytic conditions. The results showed significant synergy between plasma and catalyst at low temperatures, leading to increased CO2 conversion. The plasma-catalytic reaction had lower activation energy and promoted CO2 activation.
Non-thermal plasma can provide an alternative to CO2 utilization under mild conditions. Understanding the effect of plasma on catalysis is highly desired. Herein, a comparative study was performed on CO2 hydrogenation under thermal-catalytic and plasma-catalytic conditions using an alumina-supported cobalt catalyst. Significant plasma-catalyst synergy was attained at the low-temperature range between 423 K and 498 K where the CO2 conversion increased up to approximately 3.6 times of the sum of that using plasma or catalyst individually. The plasma-catalytic reaction showed a significantly lower activation energy (-40 kJ/mol), which is only half of that in the thermal catalytic reaction (-80 kJ/mol). Kinetic analysis and DRIFTS results indicate that CO2 activation is promoted by plasma with the assistance of active H species from gas phase. Furthermore, the total H-2 adsorption capacity and the coverage of irreversible adsorbed H species on the metal surface were decreased under plasma. The promotion effect is very likely due to a new reaction pathway introduced by plasma on the 15Co/Al2O3 catalyst under the conditions studied. No obvious difference in the structure and morphology changes was observed between the spent catalysts after thermal and plasma reactions.
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