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Enhanced catalytic ozonation over reduced spinel CoMn2O4 for NOx removal: active site and mechanism analysis

机译:在还原型尖晶石CoMn2O4上增强的催化臭氧氧化作用以去除NOx:活性位点和机理分析

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摘要

In this paper, CO atmosphere reduced cobalt manganate (CoMn2O4/CO), prepared by a hydrothermal method, was successfully utilized in catalytic ozonation for NOx removal. CoMn2O4/CO shows higher activity (84%) than CoMn2O4/air (82%), Co3O4 (76%) and Mn2O3 (76%). Hydroxyl radicals (center dot OH) have been detected in the catalytic ozonation process, which has been confirmed to determine the catalytic performance of NOx removal. Compared to Co3O4 and Mn2O3, CoMn2O4 exhibits more surface hydroxyl groups and oxygen vacancies, both of which are critical for the center dot OH generation. More importantly, more oxygen vacancies are generated when the CoMn2O4 is calcined in the reduced atmosphere. These oxygen vacancies benefit the adsorption of sufficient H2O to yield active surface -OH on the catalyst surface, promoting the adsorption of O-3 on the surface -OH and thus the production of center dot OH radicals. A possible mechanism for the catalytic ozonation of NOx was proposed.
机译:本文采用水热法制备的CO气氛还原的锰酸钴(CoMn2O4 / CO)被成功地用于催化臭氧氧化去除NOx。 CoMn2O4 / CO的活性(84%)比CoMn2O4 /空气(82%),Co3O4(76%)和Mn2O3(76%)高。在催化臭氧化过程中已检测到羟基自由基(中心点OH),已证实该羟基决定了NOx去除的催化性能。与Co3O4和Mn2O3相比,CoMn2O4具有更多的表面羟基和氧空位,这两者对于生成中心点OH至关重要。更重要的是,在还原性气氛中煅烧CoMn2O4时会产生更多的氧空位。这些氧空位有利于吸附足够的H 2 O以在催化剂表面上产生活性表面-OH,从而促进O-3在表面-OH上的吸附并因此产生中心点OH自由基。提出了NOx催化臭氧氧化的可能机理。

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