详细信息
球状活性炭担载MnO_x-CeO_2和尿素的低温无氨脱硝行为研究 ( EI收录)
Removal of NO at low temperature and in the absence of ammonia over spherical activated carbon loaded with MnO_x-CeO_2 and urea
文献类型:期刊文献
中文题名:球状活性炭担载MnO_x-CeO_2和尿素的低温无氨脱硝行为研究
英文题名:Removal of NO at low temperature and in the absence of ammonia over spherical activated carbon loaded with MnO_x-CeO_2 and urea
作者:李军[1];殷迪[1];马成[1];乔文明[1,2];王际童[1,3];凌立成[1]
机构:[1]华东理工大学化学工程联合国家重点实验室,上海200237;[2]华东理工大学特种功能高分子材料及相关技术教育部重点实验室,上海200237;[3]上海华明高技术(集团)有限公司,上海200231
年份:2018
卷号:46
期号:6
起止页码:725
中文期刊名:燃料化学学报
外文期刊名:Journal of Fuel Chemistry and Technology
收录:CSTPCD;;EI(收录号:20183905875957);Scopus;北大核心:【北大核心2017】;CSCD:【CSCD2017_2018】;
基金:国家自然科学基金(U1710252;U1303291;21506061);中国科协青年人才托举工程和上海市青年科技启明星计划(17QB1401700)资助~~
语种:中文
中文关键词:球形活性炭;MnOx-CeO2;尿素;NO;选择性催化还原
外文关键词:spherical activated carbon;MnOx-CeO2;urea;NO;selective catalytic reduction
摘要:以MnO_x-CeO_2为活性组分、以尿素为还原剂,制备了球形活性炭(SAC)担载MnO_x-CeO_2和尿素的复合催化剂,利用扫描式电子显微镜-能谱仪(SEM-EDS)、X射线衍射(XRD)和低温N_2吸附-脱附等对催化剂的物理化学结构进行了表征,考察了该催化剂在低温(30-90℃)和没有氨气情况下对NO的选择性催化还原(SCR)性能。结果表明,在30-50℃的反应温度下,炭载体的微孔孔容仍是NO吸附与氧化的主要活性位点;而在70-90℃的反应温度下,锰铈金属氧化物成为NO吸附与氧化的主要活性位点,从而提高了催化剂的SCR反应活性。当反应温度为90℃、空速为6000 h^(-1)、NO和O_2浓度分别为0.05%和20%时,担载8%Mn(锰铈物质的量比为1∶1)和10%尿素的催化剂的NO_x稳态脱除率可达85.6%,实现了在低温、无氨状况下的高效脱硝。
A complex catalyst was prepared by loading MnOx-CeO2 and urea on spherical activated carbon( SAC) for the selective catalytic reduction( SCR) of NO at lowtemperature( 30-90 ℃) in the absence of ammonia. The complex catalyst was characterized by scanning electron microscopy-energy dispersive spectrum( SEM-EDS),X-ray diffraction( XRD),and N+2 sorption. The results showthat at 30-50 ℃,the micropores of SAC acts as the main active sites for NO adsorption and reaction,whereas at 70-90 ℃,MnOx-CeO2 turns to be the main active sites for NO adsorption and reaction; the urea-SCR activity is enhanced by MnOx-CeO2 in a wide temperature range. Over the complex catalyst loaded with 8% Mn( the mole ratio of Mn to Ce is 1) and 10%urea,the steady conversion of NOx reaches 85.6% in the absence of ammonia,under the conditions of 90 ℃,0.05% NO,20% O2 and a space velocity of 6000 h^-1.
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