Abstract: The mother liquid of microporous TS-1 crystallization process was recycled and used as the medium for the preparation of hierarchical TS-1 zeolites. In the system of recycled mother liquid as medium, the effects of the template agent and alkali on the preparation of hierarchical TS-1 were investigated, respectively. The results showed that while retaining the MFI structure, the prepared hierarchical TS-1 formed more mesoporous pores and exhibited superior catalytic activity in the cyclohexanone ammoximation. At a lower catalyst concentration (1.6 g/L), the cyclohexanone conversion rate was 94% and the cyclohexanone-oxime selectivity was 99%. The recycled mother liquid reduced the consumption of water and the discharge of waste liquid, and agreed with the development requirements of green chemistry.

Key words: recycled mother liquid, TS-1 zeolite, hierarchical pores, cyclohexanone ammoximation