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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Influence of the synergistic effect between Co-N-C and ceria on the catalytic performance for selective oxidation of ethylbenzene
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Influence of the synergistic effect between Co-N-C and ceria on the catalytic performance for selective oxidation of ethylbenzene

机译：Co-N-C与二氧化铈的协同效应对乙苯选择性氧化催化性能的影响

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摘要

A series of catalysts, i.e. metal oxides (MO) such as CeO2, Fe2O3 and Al2O3 supported Co-N-C (Co-N-C/MO) were prepared by heating supported cobalt porphyrin in a N-2 atmosphere. Among the Co-N-C/MO catalysts, Co-N-C/CeO2 shows a remarkable catalytic performance for ethylbenzene oxidation with ethylbenzene conversion of 33.1% and selectivity to acetophenone of 74.8%. In addition, the interaction between Co-N-C and supports was tentatively characterized by techniques such as XRD, HRTEM, XPS etc. According to XPS, the presence of the redox cycle between Ce3+ and Ce4+ in CeO2 facilitates the formation of cobalt ions in the high valence state and the Co-N-x sites, which are typically responsible for the high catalytic activity. The high performance benefits from the synergistic effect between Co-N-C and CeO2 and the well-dispersed Co-based sites.
机译：通过在N-2气氛中加热负载的卟啉钴来制备一系列催化剂，即诸如CeO 2，Fe 2 O 3和Al 2 O 3负载的Co-N-C的金属氧化物（MO）（Co-N-C / MO）。在Co-N-C / MO催化剂中，Co-N-C / CeO2对乙苯氧化显示出显着的催化性能，乙苯转化率为33.1％，对苯乙酮的选择性为74.8％。此外，还通过XRD，HRTEM，XPS等技术初步表征了Co-NC与支持物之间的相互作用。根据XPS，CeO2中Ce3 +和Ce4 +之间的氧化还原循环的存在促进了高浓度钴离子的形成。价态和Co-Nx位点，通常负责高催化活性。高性能得益于Co-N-C和CeO2之间的协同效应以及分散良好的Co基位点。

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