Experimental Study of Benzene Catalytic Combustion over Cu–Mn‐Ce/Al2O3 Particles,ChemistrySelect

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Experimental Study of Benzene Catalytic Combustion over Cu–Mn‐Ce/Al2O3 Particles
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-01-20 , DOI: 10.1002/slct.201902976
Peng Wang _{1,

2} , Yu He _{1,

2} , Zhongqing Yang _{1,

2} , Xianwei Liu _{1,

2} , Jingyu Ran _{1,

2} , Mingnv Guo _{1,

3}

Affiliation

Low concentration benzene is one of major components of volatile organic compounds (VOCs) which pollutes atmosphere. In this study, the influence of addition of cerium(Ce) and manganese(Mn) on alumina supported copper catalyst(Cu/γ‐Al₂O₃) for benzene combustion is studied, using X‐ray diffraction pattern (XRD), scanning electron microscopy (SEM) coupled with Energy‐dispersive X‐ray (EDX), hydrogen‐temperature programmed reduction(H₂‐TPR) and Fourier transform infrared spectroscopy(FTIR). The Cu−Mn‐Ce catalyst with a molar ratio of 1:1.5:0.5 and 10% capacity exhibited catalytic performance with calcination temperature of 600 °C and gas hourly space velocity (GHSV) which is less than 2 h⁻¹. Ce improves the formation of lattice oxygen(O_latt) while Mn is beneficial for the augment of surface oxygen(O_sur) and adsorbed oxygen(O_ads). Synergistic effect of Mn and Ce can further increase the content of surface oxygen and adsorbed oxygen, which improves catalytic activity. The inferred benzene combustion process is as follows: break of the C−H bound→ the breakage of benzene ring through the breaking of the C−C bond and the C=C bond→ generation of water and carbon dioxide.

中文翻译：

Cu-Mn-Ce / Al2O3颗粒上苯催化燃烧的实验研究

低浓度苯是会污染大气的挥发性有机化合物（VOC）的主要成分之一。在这项研究中，除了铈（Ce）和锰（Mn）的在氧化铝上负载的铜催化剂（铜/γ-Al系的影响₂ ø ₃）对苯燃烧进行了研究，使用X射线衍射图（XRD），扫描电子显微镜（SEM）结合能量色散X射线（EDX），氢温度程序还原（H ₂ -TPR）和傅里叶变换红外光谱（FTIR）。摩尔比为1：1.5：0.5和容量为10％的Cu-Mn-Ce催化剂在600°C的煅烧温度和小于2 h ^-1的气时空速（GHSV）下表现出催化性能。铈改善了晶格氧的形成（O_latt）而Mn有利于增加表面氧（O _sur）和吸附氧（O _ads）。Mn和Ce的协同作用可以进一步增加表面氧和吸附氧的含量，从而提高催化活性。推测的苯燃烧过程如下：CH键断裂→通过CC键和C = C键断裂导致苯环断裂→水和二氧化碳的产生。

更新日期：2020-01-21

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