通常沸石分子筛系指结晶的硅酸铝,其中AlO_4四面体和 SiO_4四面体是组成其骨架结构的基本单元。1982年美国 UCC 公司开发的一类新型分子筛系磷酸铝 AlPO_4-n 分子筛。可作为吸附剂、催化剂或催化剂载体等。这类分子筛的骨架是由 PO_4~+和 PO_4~-四面体交替组成的,因而骨架呈中性,并且没有可交换的阳离子,缺乏对正碳离子催化活性所需的质子酸,呈弱酸催化性能。 Zeolite molecular sieve usually refers to crystalline aluminum silicate, which AlO 4 tetrahedrons and SiO 4 tetrahedron is composed of the basic structure of its basic unit. In 1982 a new type of molecular sieve aluminum phosphate AlPO 4-n molecular sieve developed by American UCC company. Can be used as adsorbent, catalyst or catalyst carrier. The framework of this kind of molecular sieve is composed of PO 4 + and PO 4 4- tetrahedrons alternating, so the skeleton is neutral, and there is no exchangeable cations, lacking the proton acids required for the catalytic activity of the ortho-carbon ions, and exhibiting a weak acid catalytic property .