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用于NH₃选择性催化还原NO的Cu-Ce/TiO₂催化剂的不同形貌及溶胶-凝胶纳米颗粒的漫反射红外傅里叶变换光谱研究

Different morphologies on Cu-Ce/TiO catalysts for the selective catalytic reduction of NO with NH and DRIFTS study on sol-gel nanoparticles.

作者信息

Zhuang Ke, Jin Pengkai, Yang Liu, Yao Jie, Yu Lemeng, Sheng Zhongyi, Chu Xinyue, Zhuang Zhipeng, Chen Xiongbo

机构信息

State Power Environmental Protection Research Institute Nanjing 210031 Jiangsu China.

School of Environment, Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology, Nanjing Normal University Nanjing 210023 Jiangsu China

出版信息

RSC Adv. 2023 Sep 1;13(37):25989-26000. doi: 10.1039/d3ra03018k. eCollection 2023 Aug 29.

DOI:10.1039/d3ra03018k
PMID:37664208
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10472399/
Abstract

The copper-cerium binary oxide catalysts supported by titanium dioxide with nanosphere core-shell structures, nanotube (TNT) core-shell structures, impregnation (imp) nanoparticles and sol-gel nanoparticles were prepared for NH-SCR of NO under medium-low temperature conditions. The effect of different morphologies on the Cu-Ce/TiO catalysts was comprehensively studied through physicochemical characterization. The results showed that the sol-gel nanoparticles exhibited 100% NO reduction efficiency in the temperature range of 180-400 °C. Compared with the other catalysts, the sol-gel nanoparticle catalyst had the highest dispersion and lowest crystallinity, indicating that morphology played an important role in the NH-SCR of the catalyst. The DRIFTS study on the sol-gel nanoparticle catalyst shows that cerium could promote Cu to produce abundant Lewis acid sites, which would significantly increase the adsorption reaction of ammonia on the catalyst surface, thereby promoting the occurrence of the Eley-Rideal (E-R) mechanism. With the Ce-Ti interaction on the atomic scale, the Ce-O-Ti structure enhanced the redox properties at a medium temperature. In addition, cerium oxide enhances the strong interaction between the catalyst matrix and CuO particles. Therefore, the reducibility of the CuO species was enhanced.

摘要

制备了具有纳米球核壳结构、纳米管（TNT）核壳结构、浸渍（imp）纳米颗粒和溶胶-凝胶纳米颗粒的二氧化钛负载的铜铈二元氧化物催化剂，用于中低温条件下NO的NH-SCR反应。通过物理化学表征全面研究了不同形貌对Cu-Ce/TiO催化剂的影响。结果表明，溶胶-凝胶纳米颗粒在180-400℃温度范围内表现出100%的NO还原效率。与其他催化剂相比，溶胶-凝胶纳米颗粒催化剂具有最高的分散度和最低的结晶度，表明形貌在催化剂的NH-SCR反应中起重要作用。对溶胶-凝胶纳米颗粒催化剂的DRIFTS研究表明，铈可以促进Cu产生丰富的路易斯酸位点，这将显著增加氨在催化剂表面的吸附反应，从而促进埃利-里德（E-R）机理的发生。通过原子尺度上的Ce-Ti相互作用，Ce-O-Ti结构在中温下增强了氧化还原性能。此外，氧化铈增强了催化剂基体与CuO颗粒之间的强相互作用。因此，CuO物种的还原能力得到增强。

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