新型纳米钯基催化剂的火焰合成与催化点火

摘要

Nano palladium-based catalysts were synthesized in a swirl-stabilized stagnation flame. TiO2 particles work as the catalysts support,with the crystal form of anatase and particle diameter of 9.2 nm on average. Compared with traditional chemical impregnation method,catalysts made by flame synthesis exhibit higher production rate and more stable Pd@TiO2structure. Catalytic ignition of methane was investigated using the catalysts made by flame syn-thesis. At the temperature of 325°,the conversion rate of methane reached 20%,which is lower than existing results under similar conditions in literature. The high catalytic activity is attributed to smaller particle size and larger specific surface area.%用滞止旋流火焰合成了新型纳米钯基催化剂，其载体为锐钛矿型TiO2颗粒，平均粒径为9.2,nm．相比于传统的化学浸渍法，该合成方法反应速率快，可以形成稳定的Pd@TiO2负载型纳米催化剂．在此基础上，本文研究了该催化剂对甲烷点火的催化特性．在固定床实验中，甲烷在325,℃时达到了20%的临界转化率，从而成功点火．该温度比文献中相同环境下的实验结果低，这是由于滞止旋流火焰合成的催化剂具有更小的颗粒粒径与更大的比表面积．