采用共沉淀-浸渍法制备了Pt/Co-Ba-Al-O催化剂,用X射线衍射、X射线吸收近边结构和扩展X射线吸收精细结构等手段表征了催化剂的微观结构,并在连续流动微型反应器上测定了催化剂对NOx的储存性能. 载体经过800 ℃焙烧后,Co物种主要以四面体配位的铝酸钴相存在. 在富氧条件下,高分散的小颗粒铝酸钴相促进了NO向NO2的转化,大大改善了催化剂对NOx的储存性能. 铂物种则以小的金属原子簇形式存在,分散度很高. 钴助剂的添加改善了氧化铝相的分散度,抑制了金属铂原子簇与载体的相互作用,使铂在催化剂表面分散得更均匀,从而有利于NOx的储存.
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