TiO_2对In-Ag-O/γ-Al_2O_3催化剂上CO选择性还原NO的改性研究

TiO_2 doped In-Ag-O/γ-Al_2O_3 for selective catalytic reduction of NO with CO

以Ti O2、γ-Al2O3及Ti O2-γ-Al2O3复合氧化物为载体,以In-Ag-O基为活性组分,采用等体积浸渍法制备了一系列In/Ag催化剂,通过XRD、BET、SEM、H2-TPR等技术手段对催化剂表面形态进行分析,并考察了催化剂对CO选择性还原NO的反应活性和载体中Ti O2含量对催化性能的影响.结果表明,Ti O2的添加促进了活性组分铟和银物种的分散,当Ti O2的含量为载体的15%时制备的催化剂活性最高,合适的Ti O2与γ-Al2O3配比使活性组分与载体之间发生了强烈的相互作用,由此提高了CO选择性还原NO的活性.

A series of In/Ag-based catalysts with In-Ag-O as the active components were prepared by impregnation method using Ti O2,γ-Al2O3,and Ti O2-γ-Al2O3 as the carriers. The micro-structure of the catalysts was fully characterized by XRD,BET,SEM,and H2-TPR technology. The catalytic activity of selective reduction of NO with CO,and the effect of Ti O2 content on the catalytic performance were investigated. The results indicated that the addition of Ti O2 promoted the dispersion of indium and silver species,whereas the optimal activity was obtained with 15 wt% Ti O2 applied in the carrier.It was assumed that an appropriate ratio of Ti O2 and γ-Al2O3 might induce a strong interaction between the active components and carriers,which may lead to an improvement of catalytic activity for selective reduction of NO with CO.