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Poisoning Effect Comparison of ZnCl2 and ZnSO4 on Mn‐Ce/AC Catalyst for Low‐Temperature SCR of NO
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-08-04 , DOI: 10.1002/slct.202002233
Zenghui Su 1 , Shan Ren 1 , Jie Yang 1 , Lu Yao 1 , Yuhan Zhou 1 , Zhichao Chen 1 , Tianshi Zhang 1
Affiliation  

In this study, the effect of different zinc salts (ZnCl2 and ZnSO4) on the deactivation of activated carbon(AC)‐based Mn−Ce catalysts and the poisoning mechanism of zinc salts on Mn−Ce/AC are comparatively studied. SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD and In‐situ DRIFT are used to characterize the physical and chemical changes of Mn−Ce/AC catalyst. The Selective Catalytic Reduction (SCR) activities of Mn−Ce/AC has a noticeable decline after loading zinc salts, and the highest NO conversion of Zn poisoning catalysts do not exceed 70 %. And the acid site is occupied by Zn2+ on the catalyst, which affects the chemical adsorption of NH3 and hinders the formation of the intermediate ‐NH2. Moreover, the decrease of Mn4+, reducibility of manganese oxide and acid sites are more serious on ZnC−Mn‐Ce/AC. Besides, loading ZnSO4 can improve the content of Ce3+ and Oβ on catalyst surface, which can mitigate the poisoning effects of ZnSO4 on Mn−Ce/AC catalyst. Hence, ZnCl2 displays a more serious poisoning effect on Mn−Ce/AC catalyst compared with ZnSO4. Then the probable mechanism model of ZnCl2 and ZnSO4 on Mn−Ce /AC catalyst is proposed and compared.

中文翻译:

ZnCl2和ZnSO4在Mn-Ce / AC低温NO SCR催化剂中毒作用比较

在这项研究中,比较研究了不同锌盐(ZnCl 2和ZnSO 4)对基于活性炭(AC)的Mn-Ce催化剂失活的影响以及锌盐对Mn-Ce / AC的中毒机理。SEM,BET,XRD,XPS,H 2 -TPR,NH 3 -TPD和原位DRIFT用于表征Mn-Ce / AC催化剂的物理和化学变化。加载锌盐后,Mn-Ce / AC的选择性催化还原(SCR)活性显着下降,并且Zn中毒催化剂的最高NO转化率不超过70%。酸位被催化剂上的Zn 2+占据,这会影响NH 3的化学吸附并阻碍中间体-NH的形成2。此外,在ZnC-Mn-Ce / AC上,Mn 4+的减少,氧化锰的还原性和酸性部位更严重。此外,负载的ZnSO 4可以提高Ce含量3+和O β对催化剂表面上,这可以减轻的ZnSO的中毒效果4上的Mn-CE / AC催化剂。因此,与ZnSO 4相比,ZnCl 2对Mn-Ce / AC催化剂的毒害作用更为严重。然后提出并比较了ZnCl 2和ZnSO 4在Mn-Ce / AC催化剂上的可能机理模型。
更新日期:2020-08-04
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