Super-hydrophobic Ti-containing nanometer mordenite molecular sieve preparation method

Abstract

The invention discloses a super-hydrophobic Ti-containing nanometer mordenite molecular sieve preparation method. The method includes the steps of first synthesizing of a nanometer mordenite molecular sieve multi-mesoporous structure as a precursor, then implanting a Ti reactivity center in a zeolite framework through a transition metal supplement method after combined with a deep dealumination and gas-solid isomorphous replacement method, and finally treating after surface modification with an organic silylating agent to prepare a super-hydrophobic Ti-containing nanometer mordenite molecular sieve. The super-hydrophobic Ti-containing nanometer mordenite molecular sieve preparation method has the significant advantages of using the organic silylating agent of higher hydrophobicity to replace traditional inorganic silicon fluoride acid greatly damaging the framework as a regulating agent for protecting the microporous structure of the zeolite molecular sieve and avoiding producing any secondary environmental pollution in the synthesis process. In addition, the capacity of the metal atom Ti in the zeolite molecular sieve framework can be effectively regulated by adjusting the silica to alumina ratio of a synthesis system and the variety and temperature of the precursor of the gas-solid isomorphous replacement.

Description

technical field [0001] The invention relates to the synthesis of zeolite molecular sieves, in particular to a synthesis method of superhydrophobic transition metal-containing nano-mordenite molecular sieves. Specifically, the nano-mordenite molecular sieve with rich mesoporous structure is used as the precursor, combined with deep dealumination and gas-solid same-crystal replacement method to supplement the transition metal, and the Ti reactive center is implanted into the zeolite framework, through organosilanization Preparation of superhydrophobic Ti-containing nano-mordenite molecular sieves by post-modification of reagent surface. Background technique [0002] Microporous molecular sieves have uniform pore structure, suitable acidity and good hydrothermal stability, and have become important petrochemical catalytic materials. The hydrogen-type mordenite with one-dimensional twelve-membered ring straight cylindrical channels (pore size 0.695 nm × 0.581 nm) exhibits exc...

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Problems solved by technology

[0006] The results of literature and Chinese patent surveys show that the synthesis of nano-mordenite with surface superhydrophobicity and transition metal heteroatom doping has not been reported yet.

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