A kind of tin-containing heteroatom functional molecular sieve and its synthesis and application

Abstract

The invention discloses a functional molecular sieve containing tin heteroatoms and a synthesis method thereof. The tin-containing heteroatom functional molecular sieve has BEA topological structure characteristics, the silicon-tin ratio (atomic ratio) ranges from 80 to 1000, and a synthesis method for preparing the tin-containing Beta molecular sieve by using boric acid-assisted hydrothermal synthesis technology. Mix tin source, silicon source, boric acid, templating agent, water and seed crystal uniformly according to a certain ratio and feeding method, crystallize at a certain temperature for a certain period of time, and obtain Sn-Beta heteroatom functional molecular sieve after separation, washing and drying , the crystallized product can be directly used as a catalyst or a catalyst carrier. The Sn-Beta heteroatom functional molecular sieve has good catalytic performance in biomass catalytic conversion and many fine chemical reaction processes.

Description

technical field [0001] The invention relates to a functional molecular sieve containing tin heteroatoms and a synthesis method thereof. Specifically, the tin-containing heteroatom functional molecular sieve has BEA topological structure characteristics, the silicon-tin ratio (atomic ratio) ranges from 80 to 1000, and a tin-containing Beta molecular sieve is prepared by boric acid-assisted hydrothermal synthesis technology. resolve resolution. Background technique [0002] Molecular sieves are classified according to their basic composition, mainly silicate-based molecular sieves and phosphate-based molecular sieves. Since different chemical reactions have different requirements on the pore structure and surface properties of porous catalytic materials, on the one hand, the synthesis of new structural molecular sieve materials is always an important research content in materials science and catalytic science; on the other hand, the function of molecular sieve materials The ...

AI Technical Summary

Problems solved by technology

For tin-containing heteroatom molecular sieves, P.Wu et al. studied the post-synthesis method of Beta molecular sieves dealuminated by nitric acid using gas-phase SnCl4 isomorphic substitution [P.Li, G.Liu, H.Wu, Y.Liu, J.Jiang, and P.Wu, J.Phys.Chem.C, dx.doi.org / 10.1021 / jp1076966], but the gas-phase crystal substitution method has the disadvantages of being difficult to operate and difficult to control

I.Hermans etc. carry out the research [C.Hammond, S.Conrad, and I.Hermans, Angew.Chem.Int.Ed., DOI: 10.1002 / anie.201206193], this method has obvious disadvantages that the tin source used is easy to agglomerate and difficult to disperse

Images