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Enhanced plasma-catalytic decomposition of toluene over Co–Ce binary metal oxide catalysts with high energy efficiency

机译：高能量效率的Co-Ce二元金属氧化物催化剂上增强的甲苯等离子体催化分解

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In-plasma catalysis has been considered as a promising technology to degrade volatile organic compounds. Heterogeneous catalysts, especially binary metal oxide catalysts, play an important role in further advancing the catalytic performance of in-plasma catalysis. This work investigates the toluene decomposition performance over Co–Ce binary metal oxide catalysts within the in-plasma catalysis. Co–Ce catalysts with different Co/Ce molar ratios are synthesized by a citric acid method. Results show that the catalytic activity of Co–Ce catalysts is obviously superior to those of monometallic counterparts. Especially, Co _(0.75) Ce _(0.25) O _( x ) catalyst simultaneously realizes highly efficient toluene conversion (with a decomposition efficiency of 98.5% and a carbon balance of 97.8%) and a large energy efficiency of 7.12 g kW h ~(?1) , among the best performance in the state-of-art literature (0.42 to 6.11 g kW h ~(?1) ). The superior catalytic performance is further interpreted by the synergistic effect between Co and Ce species and the significant plasma–catalyst interaction. Specifically, the synergistic effect can decrease the catalyst crystallite size, enlarge the specific surface area and improve the amount of oxygen vacancies/mobility, providing more active sites for the adsorption of surface active oxygen species. Meanwhile, the plasma–catalyst interaction is able to generate the surface discharge and reinforce the electric field strength, thereby accelerating the plasma-catalytic reactions. In the end, the plasma-catalytic reaction mechanism and pathways of toluene conversion are demonstrated.
机译：等离子体催化被认为是降解挥发性有机化合物的有前途的技术。非均相催化剂，特别是二元金属氧化物催化剂，在进一步提高等离子体内催化的催化性能中起重要作用。这项工作研究了等离子体内催化作用下Co-Ce二元金属氧化物催化剂上甲苯的分解性能。通过柠檬酸法合成具有不同Co / Ce摩尔比的Co-Ce催化剂。结果表明，Co-Ce催化剂的催化活性明显优于单金属催化剂。尤其是，Co _（0.75）Ce _（0.25）O _（x）催化剂可同时实现高效的甲苯转化（分解效率为98.5％，碳平衡为97.8％）和7.12 g kW h的大能源效率〜（？1），在最新文献中的最佳性能中（0.42至6.11 g kWh〜（？1））。 Co和Ce物种之间的协同作用以及显着的等离子体-催化剂相互作用进一步解释了优异的催化性能。具体地，协同作用可以减小催化剂微晶尺寸，增大比表面积并改善氧空位/迁移率的量，从而提供更多的活性位用于吸附表面活性氧。同时，等离子体-催化剂的相互作用能够产生表面放电并增强电场强度，从而加速了等离子体-催化反应。最后，阐述了等离子体催化反应机理和甲苯转化途径。

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