Cobalt doped Fe-Mn@CNTs catalysts with highly stability for lowtemperature selective catalytic reduction of NO_(x)  

作　　者：Pengfei Li Tiezhen Zhang Haixiao Sun Yufeng Gao Yanyuan Zhang Yuanyuan Liu Chengmin Ge Hao Chen Xiaoping Dai Xin Zhang 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering,China University of Petroleum,Beijing 102249,China [2]Petrochina Daqing Petrochemical Research Center,Daqing 163714,China [3]ShanDong DongYuan New Material Technology Co.,Ltd,Dongying 257300,China

出　　处：《Nano Research》2022年第4期3001-3009,共9页纳米研究（英文版）

基　　金：The authors acknowledge financial support from the National Natural Science Foundation of China(No.21573286);the Key scientific and technological innovation projects in Shandong Province(No.2019JZZY010343).

摘　　要：In this paper,we report the fabrication of cobalt-doped de-NO_(x)catalyst by pyrolyzing an analogous metal-organic framework-74(MOF-74)containing Fe&Mn.The resulted catalyst exhibits distinctive microstructures of manganese,cobalt,and iron immobilized on N-doped carbon nanotubes(CNTs).It is found through experiments that the trimetallic catalyst Fe_(2)Mn_(1)Co_(0.5)/CNTs-50 has the best NH_(3)-selective catalytic reduction(SCR)performance.The Fe_(2)Mn_(1)Co_(0.5)/CNTs-50 exhibited excellent water and sulfur resistance and good stability under the harsh gas environment of 250℃ and/or 170℃,NO=NH_(3)=1,000 ppm,8 vol.%O_(2),20 vol.%H2O,1,000 ppm SO_(2),and gas hourly space velocity(GHSV)=75,000 h^(-1).The de-NO_(x)conversion was maintained about 55%and 25%after 192 h.The water and sulfur resistance performance were much higher than commercial vanadium series catalyst.The highly water and sulfur resistance performance may be attributed to the unique core-shell microstructure and the synergistic effect of manganese,cobalt,and iron which helps reduce the formation for byproducts(NH_(4)HSO_(4)).This study may promote to explore the development of a high stability catalyst for low-temperature selective catalytic reduction of NO_(x)with NH_(3).

关 键 词：low-temperature NH_(3)-selective catalytic reduction(SCR) metal-organic framework(MOFs) water and sulfur resistance high stability 

分 类 号：O64[理学—物理化学]