摘要
采用过渡金属M(M=Mn、Co、Fe和Cu)掺杂改性自发沉积策略制备的非晶态CeO_2@TiO_2催化剂,考察M-CeO_2@TiO_2选择性催化还原NO_x的低温活性,并通过XRD、TEM、N2吸附-脱附、H2-TPR、NH3-TPD及in-situ FT-IR等表征手段研究M-CeO_2@TiO_2的结构、表面性质以及低温NH3-SCR反应过程。结果表明,M-CeO_2@TiO_2具有更优异的低温氧化还原能力以及更多的表面酸量,且Cu掺杂对CeO_2@TiO_2选择性催化还原NO_x低温活性具有最为显著的促进作用。Cu-CeO_2@TiO_2催化剂在低温NH3-SCR反应过程中同时存在E-R机理和L-H机理,但是由于"快速SCR"使得L-H机理反应起关键作用。
Transition metal M（M=Mn,Co,Fe and Cu）modified amorphous CeO2@TiO2 catalysts were prepared via a spontaneous deposition strategy.The low-temperature de NOx activity of M-CeO2@TiO2 for selective catalytic reduction was investigated.XRD,TEM,N2adsorption-desorption,H2-TPR,NH3-TPD and in-situ FT-IR were used to study the structure,surface property and low-temperature NH3-SCR reaction performance of M-CeO2@TiO2 .The results showed that the M-CeO2@TiO2 had better low-temperature oxidation reducibility and more surface acid.Cu doping had the most significant promoting effect on low-temperature de NOx activity for selective catalytic reduction.During the low-temperature NH3-SCR reaction,both the L-H and E-R mechanisms existed over the Cu-CeO2@TiO2 and the L-H mechanism could play a pivotal role due to the＂fast SCR＂process.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2017年第4期497-504,共8页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(21306089)
江苏省创新基金(SJLX15-0347)资助~~
关键词
过渡金属掺杂
非晶态
选择性催化还原
低温活性
促进作用
transition metals doping
amorphous phase
selective catalytic reduction
low-temperature activity
promoting effect
