Synthesis of quaternary ammonium salts with different end-capping structures and their application in molecular sieve synthesis

Abstract

Zeolite molecular sieves have complex and changeable structures and unique pore systems, which are excellent catalysts and are widely used in petrochemical industry and fine chemicals synthesis. Zeolite Socony Mobil-5 (ZSM-5) zeolite with ordered microporous-mesoporous characteristics, suitable surface acidity, thermal stability and non-carbon deposition have become one of the landmark research hotspots in the controlled synthesis and application of molecular sieves. In the synthesis of this kind of molecular sieves, different double quaternary ammonium surfactants are used as structural directing agents. The special structure of ZSM-5 is not like the cage of A, X and Y zeolites, and its pore is its cavity, which makes ZSM-5 show unique application potential in adsorption and catalytic applications. In this paper, Quaternary Ammonium Salts with Different End-capping Structures are used as the Structure-directing Agent(SDA), using experimental characterization data for comparative analysis, and the SDA synthesis and its application in Molecular Sieve Synthesis.