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减少三效催化转化器中的铂族金属使用量,并在严酷的催化反应气体环境中保持其净化性能,这已成为研究人员的共识。根据最近关于钯、铑催化剂热老化研究的报道,可得出以下结论:(1)氧化钯是避免钯烧结现象的关键,而在氧化铝材料上均匀地分散钡则可有效地保持氧化钯的形态;(2)用多孔质氧化铝在三维纳米结构中分散钯粒子,对预防钯的烧结有较大的作用;(3)利用镧添加氧化铝的材料包裹铈-锆-铑复合体的结构,可以抑制铑的烧结。
It has become the consensus of researchers to reduce the amount of platinum group metal used in a three-way catalytic converter and maintain its purification performance in a harsh catalytic reaction gas environment. According to the recent reports on the thermal aging of palladium and rhodium catalysts, the following conclusions can be drawn: (1) Palladium oxide is the key to avoiding palladium sintering, whereas the uniform dispersion of barium on alumina material effectively maintains the palladium oxide Morphology; (2) porous aluminum oxide dispersed in three-dimensional nano-structure of palladium particles, to prevent the sintering of palladium play a greater role; (3) lanthanum alumina-coated material wrapped cerium - zirconium - rhodium complex structure , It is possible to suppress rhodium sintering.