Co/MCM-41 catalyst and preparation method thereof

Abstract

The invention relates to a toluene oxidation catalyst, and especially relates to a Co / MCM-41 catalyst and a preparation method thereof. The method comprises the following steps: mixing solid cetyl trimethyl ammonium bromide (CTAB) powder and a proper amount of water, and performing stirring until the above powder is dissolved fully; adjusting the system pH value to be 11-12 by using ammonia waterunder intense stirring, and performing stirring continuously for 30-40min; adding tetraethoxysilane (TEOS) to the system dropwise, pouring an aqueous solution containing cobalt ions once, and performing intense stirring for 24-26h; transferring an obtained mixed liquid to a crystallization kettle with a polytetrafluoroethylene inner liner, and allowing the obtained liquid to stand for 24-26h for crystallization under constant-temperature and dry conditions, wherein the temperature is 110+ / -5 DEG C; performing cooling on the crystallization kettle, performing vacuum filtration, and putting an obtained material into a calorstat with a temperature of 60+ / -5 DEG C, and performing drying for 12-24h; and after the obtained material is dried fully, transferring the dried material to a crucible, putting the crucible to a muffle furnace, and performing roasting to obtain the Co / MCM-41 catalyst.

Description

technical field [0001] The invention relates to a toluene oxidation catalyst, in particular to a Co / MCM-41 catalyst and a preparation method thereof. Background technique [0002] Molecular sieves refer to a class of substances with uniform micropores whose pore size is equivalent to that of ordinary molecules. They can be used as high-efficiency desiccants, selective adsorbents, catalysts, ion exchangers, etc. There are many types of molecular sieves, which can be classified according to different methods. According to the spatial arrangement of the molecular sieve pore structure, they can be divided into ordered molecular sieves and disordered molecular sieves. Divided by pore size, molecular sieves with pore sizes less than 2nm, 2-50nm and greater than 50nm are called microporous, mesoporous and macroporous molecular sieves, respectively. [0003] In the 1960s, when researchers were looking for suitable industrial catalysts, they discovered a catalyst that widely exists ...

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Problems solved by technology

[0006] However, pure silicon-based mesoporous molecular sieves also have very obvious structural defects. The lattice in the skeleton will lack protonic acid and L-acid centers. Molecular sieves have the problem of weak acidity, and there will be many surface hydroxyl groups, which cannot catalyze oxidation reactions. , the pore wall shows no stable structure, because its hydrothermal stability will be poor

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