Au/CeO_2催化剂的制备及其对CO催化氧化性能的研究

Study on Preparation of Au/CeO_2 Catalyst and Catalytic Performance for CO Oxidation

采用水溶液沉淀法和沉积-沉淀法分别制备了CeO2载体及相应Au/CeO2催化剂,以CO氧化反应为表征反应,考察了载体制备条件,催化剂的焙烧温度、预处理温度和气氛以及活性组分负载量对催化剂性能的影响,并对催化剂进行了BET、XRD和TEM表征,分析了影响催化剂活性的原因.结果表明,载体的制备条件对催化剂的活性有一定影响,经微波处理的载体负载活性组分后,由于活性组分和载体的接触较紧密,因此有利于催化剂活性的提高.催化剂的最佳焙烧温度为300℃,最佳活化温度为300℃,气氛为空气,最佳金负载量为4%.

In order to investigate the influence of preparation condition of support, the calcination temperature of catalyst, the pre-treatment condition and the loading of gold on the catalyst activity, several Au/CeO2 catalysts were prepared by deposition-precipitation method. And CeO2 supports were prepared by aqueous precipitation method. The catalytic combustion of CO was taken as the probe reaction for comparing the catalyst activity. The BET, XRD and TEM were carried out to analyze the influence of the factors on the catalysts activity. The results indicated that catalyst supported CeO2 treated by microwave showed high activity, which seemed related to the intimate contacting between the active component and support. The optimal conditions for the catalyst were： calcination temperature 300℃, pre-treatment condition 300 ℃ in air and 4% gold loading.