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Article Abstract
Emissions of volatile organic compounds (VOCs) threaten both the environment and human health. To realize the elimination of VOCs, Ru/CeO catalysts have been intensively investigated and applied. Although it has been widely acknowledged that the catalytic performance of platinum group metal catalysts was highly determined by their dispersion and coordination environment, the most reactive structures on Ru/CeO catalysts for VOCs oxidation are still ambiguous. In this work, starting from Ce-BTC (BTC = 1,3,5-benzenetricarboxylic acid) materials, atomically dispersed Ru catalysts and agglomerated Ru catalysts were successfully created via one-step hydrothermal method (Ru-CeO-BTC) and conventional incipient wetness impregnation method (Ru/CeO-BTC), respectively. In a typical model reaction of CH oxidation, atomically dispersed Ru species with the formation of abundant Ru-O-Ce linkages on Ru-CeO-BTC were found to perform much better than agglomerated RuO species on Ru/CeO-BTC. Further characterizations and mechanism study disclosed that Ru-CeO-BTC catalyst with atomically dispersed Ru ions and more superior low temperature redox performance compared to Ru/CeO-BTC could better facilitate the adsorption/activation of CH and the decomposition/desorption of intermediates, thus exhibiting superior CH oxidation activity. This work elucidated the reactive sites on Ru/CeO catalysts in the CH oxidation reaction and provided insightful guidance for designing efficient Ru/CeO catalysts to eliminate VOCs.
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| http://dx.doi.org/10.1021/acs.est.4c07159 | DOI Listing |
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