Pore-size matching in MoC/PC catalysts for enhanced non- thermal plasma-driven reverse water-gas shift
Limin Song , Wenfeng Huang , Lu Liang , Weiming Zhai , Xiaoxiao Yu , Min Xu , Yanhong Chao , Wenshuai Zhu
The interplay between catalyst pore architecture and plasma discharge behavior is crucial for optimizing non-thermal plasma-catalytic processes. Porous carbon-supported molybdenum carbide catalysts (MCx, x = 10–1000, representing the nominal SiO2 template size) with tunable pore structures were synthesized by a hard-template method. Characterization confirmed molybdenum carbide formation within porous carbon frameworks with distinct pore dimensions. At a nominal power-supply input of 28 W, a gas hourly space velocity of 40,000 h–1, and a CO2/H2 ratio of 1:3, MC1000 achieved 20.5% CO2 conversion, 99.4% CO selectivity, and a CO energy efficiency of 0.21 mmol∙kJ–1. Although the catalyst-bed center temperature was only~172 ℃, its CO2 conversion was about 32 times that of thermal catalysis at 250 ℃, supporting plasma-dominated activation. Lissajous plots and current waveforms showed that MC1000 generated higher discharge power and more intense microdischarges than MC100. X-ray photoelectron spectroscopy, hydrogen temperature programmed reduction, and carbon dioxide temperature programmed desorption further revealed more carbide-related Mo species and moderate CO2 adsorption strength. The superior reverse water-gas shift performance of MC1000 therefore results from synergistic surface properties and pore-regulated plasma discharge behavior.
non-thermal plasma / molybdenum carbide / pore-size regulation / localized discharge
Higher Education Press 2027
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