Relationship Between Oxygen-Containing Groups and Acidity of Graphene Oxide Supported Mn-Based SCR Catalysts and the Eff
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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 Yulu Miao1,2 · Jianfeng Zheng1 · Yongjin Liu1,2 · Ning Xiang1,2 · Yifan Li1,2 · Xiaojin Han1 · Zhanggen Huang1 Received: 11 December 2019 / Accepted: 3 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract 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 M nOx, 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 lowtemperature NH3-SCR reaction. Graphic abstract The abundant oxygen-containing groups on the GO surface promoted the dispersion of the active material (MnOx) and also provided some weak acid sites.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03218-8) contains supplementary material, which is available to authorized users. * Jianfeng Zheng [email protected]; [email protected] * Zhanggen Huang [email protected] Extended author information available on the last page of the article
1 Introduction The hazy weather is becoming a more and more serious environmental problem and one of the main sources of the smog is the nitrogen oxides ( NOx), which emitted from the combustion of coal in power plants and industrial furnaces. And the emission of N Ox can cause stringent atmospheric
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pollution such as ozone holes, photochemical smog and acid rain [1, 2]. The selective catalytic reduction (SCR) of NOx with NH3 has been widely researched [3–5] and the V2O5-WO3(MoO3)/TiO2 catalyst has been employed in industry to remove the N Ox [6, 7]. However, the SCR unit often located downstream of the particulate control device and
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