甲烷催化燃烧中制备参数对NiO/CuO-ZrO2催化剂高温反应性能的影响

采用溶胶凝胶－超临界干燥的方法制备了NiO/CuO-ZrO2催化剂，分别考察了焙烧温度、活性组分含量对催化剂甲烷燃烧性能的影响，并利用XRD、物理吸附等手段考察了两个参数对催化剂性能影响的本质原因，发现NiO/CuO-ZrO2催化剂具有较高的催化活性，较好的高温（1 000 ℃）反应稳定性，焙烧温度对催化剂的影响很大，500 ℃是合适的焙烧温度，通过试验发现活性组分NiO为5 mol％时催化剂适于在相对较低的温度下使用，而NiO为15 mol％时，催化剂具有较好的高温稳定性。

EFFECT OF CATALYST PREPARATION PARAMETERS ON METHANE CATALYTIC COMBUSTION AT HIGH TEMPERATURE

Sol-gel method involving supercritical fluid drying technique was employed for the preparation of ZrO2-based materials, and NiO/CuO-ZrO2 catalysts were prepared. Reaction activity evaluation was carried out in a micro-reactor with gas chromatograph with the rise of temperature up to 1 000 ℃, and the results indicated that NiO/CuO-ZrO2 was a kind of proper catalyst in methane combustion, and most of the catalysts led to the full conversion of methane at about 700 ℃ without the production of CO. The effect of calcination temperature, CuO and NiO contents were investigated for the catalytic activity and stability of methane combustion at high temperature(1 000 ℃). Also the BET surface area, pore size distribution and X-ray Diffraction (XRD) pattern were measured. The results show that proper calcination temperature is 500 ℃, and when both NiO and CuO contents are 5 mol%, the catalyst shows high activity at relative low temperature, and when both NiO and CuO contents are 15 mol%, the catalyst shows high stability at high temperature.