原位红外光谱研究镧对负载钯催化剂上甲醇车尾气氧化机理的影响

In Situ FTIR Study of Effect of La on CH_3OH Automobile Exhaust Oxidation Mechanism on Supported Palladium Catalyst

在色谱 微反装置上考察了负载Pd催化剂的甲醇深度氧化性能 .结果表明 ,在γ 氧化铝载体中 ,添加镧对负载Pd催化剂催化活性和选择性影响较大 ,甲醇氧化含氧中间物含量大大降低 .利用in situFTIR技术测定了镧改性后的负载Pd催化剂表面的吸附物种和表面的程序升温反应 ,对负载Pd催化剂甲醇深度氧化反应机理进行了探讨 .

The performance of deep oxidation of methanol on 0.1% Pd supported on alumina was studied by a chromatograph-micro-reactor. The results showed that the addition of La intoγ-Al_2O_3 could affect the performance of Pd catalyst greatly. Although the presence of La could not lower the light-off temperature of methanol oxidation, the partial oxidation products disappeared. By usingin-situ FTIR, it is shown that La changed the adsorbed species and the methanol deep oxidation mechanism on Pd catalyst.