【摘要】 采用浸渍—涂敷技术制备掺杂的贵金属三效催化剂,研究Cu、Ni、Co、Pb、Sn和Bi含量对三效催化剂催化活性的影响,初步探讨了掺杂条件下催化剂失活机理,并考察了P204含量、皂化率、相比、溶液酸度、萃取级数等因素对深度脱除贵金属溶液中杂质元素的影响。结果表明,Cu、Ni、Co、Pb、Sn和Bi杂质含量低于10×10-6时,对制备的催化剂活性影响不明显;皂化率为30%的P204在pH=2.0、萃取时间20min的条件下,Cu、Co、Sn和Bi的单级萃取率达99%以上,而Ni和Pb经三级逆流萃取后,萃余液中Ni、Pb含量可降到10×10-6以下,萃取率分别达96.37%和96.59%。更多还原

【Abstract】 Doped precious metal three-way catalysts were prepared by technology of impregnation-coating.The effects of doping content of Cu,Ni,Co,Pb,Sn and Bi on catalytic activity were investigated.The catalyst deactivation mechanism was preliminarily explored under doping.The effects of P204 content and saponification rate,phase ratio,pH,and extraction series on deep removal of impurity elements from precious metal solution were discussed.The results show that there is no obvious influence on catalyst activity when doping levels of Cu,Ni,Co,Pb,Sn and Bi impurity contents are below 10×10-6.The single-stage extraction rates of Cu、Co、Sn、Bi are 99%above under the conditions of pH=2.0and extraction duration of 20 min with 30%saponated P204,while content of Ni and Pb in solution can be reduced to 10×10-6 below after three-stage countercurrent extraction with extraction rate of 96.37%and 96.59%respectively.更多还原