采用沉淀-沉积法制备了一系列不同载体负载的纳米Pd催化剂.以CO氧化为模型反应,考察了载体差异对催化剂CO催化氧化性能的影响.结果发现,载体对Pd催化剂的CO催化氧化性能影响较大,以分子筛为载体的Pd催化剂的活性明显优于金属氧化物担载的催化剂.同时,考察了反应温度、时间、空速及加湿条件等对催化剂CO氧化活性的影响,并利用XRD和XPS等测试手段对催化剂体相结构和表面状态进行了表征.结果表明:催化剂的活性随着反应温度的升高而增加,随着空速的增加而降低.XRD和XPS结果证实不同载体负载的催化剂其表面活性Pd物种的状态有较大差异,分子筛载体利于活性Pd物种向催化剂表面迁移,这种作用以及Pd物种的高分散与催化剂的活性直接相关.
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