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Relationship Between Oxygen-Containing Groups and Acidity of Graphene Oxide Supported Mn-Based SCR Catalysts and the Effects on the Catalytic Activity
Catalysis Letters ( IF 2.8 ) Pub Date : 2020-04-24 , DOI: 10.1007/s10562-020-03218-8
Yulu Miao , Jianfeng Zheng , Yongjin Liu , Ning Xiang , Yifan Li , Xiaojin Han , Zhanggen Huang

Graphene oxide (GO) with abundant oxygen-containing groups was chosen as the support for the NH3-SCR catalysts. The as-prepared catalysts were systematically characterized to elucidate the effects of the surface properties and the morphological structure on catalytic activity by Raman, XPS, XRD, SEM, TEM, BET, NH3-TPD, and H2-TPR. It was found that compared with widely researched Graphene (GR), abundant oxygen-containing groups on the surface of GO provided the load sites and further promoted the dispersion of active component, which indicating the much more active sites exposed and further the better catalytic activity shown. Furthermore, the oxygen-containing groups like hydroxyl (-OH) and carboxyl (-COOH) could provide some Brønsted acid sites. After the loading of MnOx, the degree of graphitization of GO increased sharply, indicating the better electron transport and strong chemical interaction between GO and MnOx. Furthermore, the best load amount was found and the acidity was the main reason for the optimalizing performance on Mn-5/GO at low temperature. Besides, not only large specific area, but also outstanding redox performance and high dispersion of active component all contributed to the excellent performance of Mn-5/GO. Over all, this work formulated the advantages of GO worked as the support for SCR catalysts and significantly extended the cognition of GO and the selection basis of supports for the low-temperature NH3-SCR reaction. The abundant oxygen-containing groups on the GO surface promoted the dispersion of the active material (MnOx) and also provided some weak acid sites.

中文翻译:

氧化石墨烯负载锰基SCR催化剂含氧基团与酸度的关系及对催化活性的影响

选择具有丰富含氧基团的氧化石墨烯 (GO) 作为 NH3-SCR 催化剂的载体。通过拉曼、XPS、XRD、SEM、TEM、BET、NH3-TPD 和 H2-TPR,系统地表征了所制备的催化剂,以阐明表面性质和形态结构对催化活性的影响。发现与广泛研究的石墨烯(GR)相比,GO表面丰富的含氧基团提供了负载位点并进一步促进了活性成分的分散,这表明暴露的活性位点更多,催化活性更好显示。此外,羟基(-OH)和羧基(-COOH)等含氧基团可以提供一些布朗斯台德酸位点。负载MnOx后,GO的石墨化程度急剧增加,表明 GO 和 MnOx 之间更好的电子传输和强化学相互作用。此外,找到了最佳负载量,酸度是 Mn-5/GO 在低温下优化性能的主要原因。此外,不仅比表面积大,而且优异的氧化还原性能和活性组分的高分散性都促成了Mn-5/GO的优异性能。总之,这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。此外,找到了最佳负载量,酸度是 Mn-5/GO 在低温下优化性能的主要原因。此外,不仅比表面积大,而且优异的氧化还原性能和活性组分的高分散性都促成了Mn-5/GO的优异性能。总之,这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。此外,找到了最佳负载量,酸度是 Mn-5/GO 在低温下优化性能的主要原因。此外,不仅比表面积大,而且优异的氧化还原性能和活性组分的高分散性都促成了Mn-5/GO的优异性能。总之,这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。不仅比表面积大,而且优异的氧化还原性能和活性组分的高分散性都促成了Mn-5/GO的优异性能。总之,这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。不仅比表面积大,而且优异的氧化还原性能和活性组分的高分散性都促成了Mn-5/GO的优异性能。总之,这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。这项工作阐述了GO作为SCR催化剂载体的优势,显着扩展了GO的认知和低温NH3-SCR反应载体的选择依据。GO表面丰富的含氧基团促进了活性材料(MnOx)的分散,也提供了一些弱酸性位点。
更新日期:2020-04-24
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