SAPO-11 molecular sieve and preparation method and application thereof

The invention provides an SAPO-11 molecular sieve and a preparation method and application thereof, and belongs to the technical field of molecular sieve catalyst preparation. Co is doped in the SAPO-11 molecular sieve, Co doping can influence coordination between silicon and aluminum in the molecular sieve, then the property of B acid in the molecular sieve is changed, Co replaces aluminum atoms to enter an SAPO-11 framework, an acid center is formed, and the acid strength is enhanced; and Co doping can disperse silicon atoms in a crystal skeleton to generate new acid sites, and can increase the total acid site concentration so that the catalytic activity of the molecular sieve catalyst is improved, and the yield of isomers is improved. 本发明提供了一种SAPO-11分子筛及其制备方法和应用，属于分子筛催化剂制备技术领域。本发明通过在SAPO-11分子筛中掺杂Co，Co掺杂会影响分子筛内部硅、铝之间的配位，进而改变分子筛中B酸的性质，Co取代铝原子进入SAPO-11骨架，形成酸中心，增强酸强度；并且Co掺杂能够分散晶体骨架中的硅原子产生新酸位，能够增加总酸位浓度，从而提高分子筛催化剂的催化活性，提高异构体的产率。