有关分子筛离子交换?也许是微量控制交换量,防止金属颗粒长大。但是,你举的这个例子中,NH4+可能不是竞争交换剂,是缓冲溶液吧,防止Pt(NH3)4++沉淀! All the catalysts contained 1 wt.% platinum, introduced into the zeolite through ion exchange by [Pt(NH3)4)]2+ in competition with NH4+ (NH4+/[Pt(NH3)4)]2+ = 100), followed by calcination under dry air flow at 450 8C for 4h.文献里认为是竞争交换,是不是和浸渍时加入竞争吸附剂一样,希望提高金属分散度呢,查看更多