https://doi.org/10.1016/j.apsusc.2022.154924
Abstract
The catalytic oxidation of chlorinated volatile organic compounds (CVOCs) is an important topic in environmental catalysis, but the design of highly effective catalysts remains challenging. In this work, phosphate – modified Co3O4 oxides gave higher activity, better durability and much lower selectivities to Cl-containing byproducts (e.g., CH3Cl and CHCl3) compared to the pristine Co3O4 in the catalytic oxidation of dichloromethane (CH2Cl2). Such phosphate modification created more oxygen vacancies on the Co3O4 and thus enhanced reducibility. On the other hand, the presence of phosphate generated abundant surface Brønsted acid sites and suppressed surface basicity. The improved performance was related to the promoted adsorption/activation of CH2Cl2 on the surface acid sites, and synergistically facile oxidation of the reactive intermediates by the oxygen species activated on the oxygen vacancies. Moreover, on the modified catalyst, the fast oxidation of the reaction intermediate (i.e., CH3O-) inhibited the formation of CH3Cl. Meanwhile, the low surface basicity of the catalyst was probably responsible to the low selectivity to CHCl3.
有幸提前学习鲁老师的大作，看样子磷酸根在CVOCs催化燃烧中的应用已经引起了更多的研究人员的注意。我们已经证实“工业化”的应用基本没问题
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