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美国联合碳化物公司首次合成出的AlPO_4-5分子筛属六方晶系,由PO_4及AlO_4四面体单元交替组成的中性骨架构成,具有直孔道结构,孔径为0.8nm,热稳定好,但无离子交换能力,表面不具B酸,L酸也较少,不宜直接作酸性催化剂.但是它负载了金属及金属氧化物后,在裂解、加氢裂解、重整、异构化、加氢异构化及歧化等反应中都有一定的活性及选择性.专利也曾报导,AlPO_4-5经改性后渗合到沸石中用于裂解反应,可提高油品性能.
AlPO_4-5 molecular sieve first synthesized by Union Carbide Company is a hexagonal system composed of a neutral framework consisting of alternating PO_4 and AlO_4 tetrahedra units with a straight pore structure with a pore size of 0.8 nm and good thermal stability but no ion Exchange capacity, the surface is not B acid, L acid is also less, not directly as an acidic catalyst, but it is loaded with metal and metal oxides, in the cracking, hydrocracking, reforming, isomerization, hydroisomerization And disproportionation reactions have certain activity and selectivity.Patent also reported that AlPO_4-5 modified by infiltration into the zeolite for the cleavage reaction can improve the performance of the oil.