摘要
为考察溶胶-凝胶法制备的尖晶石型Cu0.7Ni0.3Fe2O4催化剂在不同反应条件下的稳定性和适应性,通过在自制的固定床反应器上模拟柴油车尾气,研究在不同反应气氛下催化剂的NH3选择性催化还原NOx性能,并利用XRD、SEM、N2吸附、FT-IR等技术对催化剂进行表征分析。结果表明:Cu0.7Ni0.3Fe2O4催化剂在不同反应气氛下的催化性能和抗硫性能各异。300~400℃为高效温度区间,其中,350℃为最佳活性温度点,而自280℃起,随着温度的提高,催化剂抗硫性能也随之提高。在10000~30000h^-1空速范围内,催化剂具有较好的适应性,催化性能和抗硫性能随着空速的增加而逐渐降低。当氧含量≥5%时,催化剂具有良好的催化活性和抗硫性能。一定的氨氮比(≥1.2)可使NO去除率达到最大。反应过程中催化剂的失活程度与SO2浓度呈正相关,催化剂在低硫浓度(≤0.035%)下具有良好的抗硫性能。
In order to investigate the stability and adaptability of spinel-type Cu0.7Ni0.3Fe2O4 catalyst prepared by sol-gel method under different reaction conditions,the diesel exhaust were simulated using self-made fixed-bed reactor.The catalyst performance of selective catalytic reduction of NO was studied under different atmospheres,and it was characterized by XRD,SEM,N2-adsorption,FT-IR technologies.The results show that the catalytic performance and sulfur resistance of Cu0.7Ni0.3Fe2O4 catalyst are different under different reaction atmospheres.300~400℃is the high temperature range,of which 350℃is the best active temperature point,and from 280℃,the sulfur resistance of the catalyst increases with the increase of temperature.In the range of 10000~30000 h^-1 space velocity,the catalyst has good adaptability that the catalytic performance and sulfur resistance decreased with the increase of space velocity.When the oxygen content is more than 5%,the catalyst has good catalytic activity and sulfur resistance.A certain NH3/NO ratio(≥1.2)can maximize the NO removal rate.The degree of deactivation of the catalyst during the reaction is positively correlated with the concentration of SO2.The catalyst has good sulfur resistance at low sulfur concentration(≤0.035%).
作者
陈一琛
梁美生
辛博
CHEN Yi-chen;LIANG Mei-sheng;XIN Bo(College of Environmental Science and Engineering,Taiyuan University of Technology,Yuci 030600,China)
出处
《科学技术与工程》
北大核心
2019年第36期378-387,共10页
Science Technology and Engineering
基金
山西省科技厅项目(20193D321082)资助
关键词
柴油车尾气
催化剂
反应气氛
氮氧化物
选择性催化还原
diesel exhaust
catalyst
reaction atmosphere
oxynitride
selective catalytic reduction
