Abstract:

Silica sol has been invented for more than 100 years，which was widely used in synthesis of molecular sieve and preparation of catalysts.The market，preparation methods and properties of silica sol were briefly reviewed.The application of silica sol in preparation of molecular sieve catalysts was mainly introduced，including the application of silica sol in silicon source，binder and preparation of small crystalline molecular sieve.Based on the research progress at home and abroad，the role and advantages of catalyst using silica sol as silicon source，binder and carrier in the synthesis of molecular sieve and preparation of catalyst were discussed in detail.According with the application status of silica sol，some problems in the preparation of molecular sieve catalysts were proposed：poor wear resistance of silica based catalyst prepared with silica sol as binder；poor dispersion of active components of catalyst prepared with silica sol as carrier；poor quality stability of silica sol products.It was pointed out that how to solve the above problems and improve the application of silica sol in the preparation of molecular sieve catalyst more effectively would be the focus of the future research.Finally，the development prospect of silica sol was discussed，and it was pointed out that on the basis of controllable synthesis of silica sol，the controllable synthesis and application development of molecular sieve and its catalyst would have a broader prospect.

Key words: silica sol, molecular sieve catalyst, silicon source, binder