Micropore-mesopore catalyst material and preparation method thereof

Abstract

The invention provides a catalyst material and a production process thereof, particularly a micropore-mesopore catalyst material for acid catalyzed reactions such as alkylation, cracking, esterification and the like, and a preparation method thereof. Specifically, organic additives such as citric acid, oxalate, glucose and the like are self-assembled with zeolite directing agent, and a thermal or hydro-thermal treatment method is employed to assist the preparation of the micropore-mesopore catalyst material. Through reactant composition and reaction condition regulation, the micropore-mesopore catalyst materials with different porous channel structures and pore sizes are synthesized. The micropore-mesopore catalyst material has the following beneficial effects: the produced catalyst material has dense mesopores, and pore walls around the mesopores are provided with micropore zeolite structure units, and the catalyst material has good catalytic performance. The used method is simple and efficient and is free from environmental pollution, and the channel system and the pore wall acidity of the micropore-mesopore catalyst material are changed by regulating the addition amount of organic additives, the hydrothermal crystallization temperature and time of silicon-aluminum sol and the molar ratio of silicon-aluminum atoms. The organic additives are used for replacing expensive mesopore template so as to greatly reduce production cost and provide preconditions for large-range popularization and application.

Description

technical field [0001] The invention relates to a chemical material and a production process, namely a microporous-mesoporous catalytic material and a preparation method thereof. Background technique [0002] The microscopic pores of solid materials play an important role in industrial production. According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), materials can be divided into three categories according to the size of the pore size: Pore materials with a pore size < 2.0 nanometers are Microporous materials, pore materials with a channel size > 50.0 nanometers are macroporous materials, and materials with a channel size between 2.0 and 50.0 nanometers are mesoporous materials. Among them, microporous materials, such as zeolite molecular sieves, have uniform and orderly crystal pores, large specific surface area, high hydrothermal stability, good ion exchange performance and rich and adjustable surface physical and chemical prop...

AI Technical Summary

Problems solved by technology

[0005] However, the preparation process of existing microporous-mesoporous materials all uses expensive CTAB or P123 as a template agent, and the cost is relatively high. At present, the price of CTAB on the market has reached more than 29 yuan / kg, and its preparation process is also relatively complicated. The raw materials involved are also very single. In addition, the CTAB template needs to be post-processed by high-temperature roasting. The process will produce toxic and harmful gases such as nitrogen oxides and pollute the air, which limits the popularization and application of this technology.

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