Method for preparing large-pore mesoporous molecular sieve

Abstract

The invention discloses a method for preparing a large-pore mesoporous molecular sieve. According to the method, a mesoporous molecular sieve with different topological structures is synthesized by using the methods reported in literature, then a certain amount of mesoporous molecular sieve raw powders or roasting samples are mixed with a solution containing small molecule organic ammonium with a certain concentration, and the large-pore mesoporous molecular sieve is prepared through controlling the crystallization temperature and crystallization time by using hydrothermal synthesis. The synthesis method is simple and has high repeatability, and the mesoporous molecular sieve finally obtained has higher hydrothermal stability; and in addition, the synthesis method does not need additional silicon sources, the synthesis cost is reduced, and the method is an environment-friendly synthesis method.

Description

technical field

[0001] The invention relates to a method for preparing mesoporous molecular sieves, in particular to a new method for preparing large-diameter mesoporous materials with high hydrothermal stability by using a hydrothermal post-synthesis strategy. Background technique

[0002] After the birth of M41S series mesoporous materials with ordered and adjustable pore size, they have attracted extensive research interest due to their wide application in catalysis, adsorption and separation (Chem. Rev. 2007, 107, 2821). However, the large-scale synthesis of mesoporous materials, low hydrothermal stability, and low reactivity have not been resolved. The most typical mesoporous materials, such as MCM-41 and MCM-48, are usually synthesized at a mild temperature below 130°C, resulting in extremely unstable mesoporous structures with a wall thickness of less than 1 nm, and pure silicon MCM-41 / 48 Mesoporous materials do not have any reactivity (J. Am. Chem. Soc., 1992, 114, ...

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