Modified IM-5 molecular sieve and preparation method and application thereof

Abstract

The invention specifically provides a modified IM-5 molecular sieve and a preparation method and application thereof, belonging to the field of modification of molecular sieves. The modified IM-5 molecular sieve has a mesoporous area of 150 m<2> / g or above and a mesoporous volume of 0.5 cm<3> / g or above. The modified IM-5 molecular sieve has a large mesoporous area and a large mesoporous volume, so a reactant can more easily contact with an acid center and a product can be rapidly diffused from active center to places out of a catalyst; thus, side reactions are prevented, and the activity, selectivity and service life of the catalyst are improved; e.g., when the modified IM-5 molecular sieve is applied to an alkylation reaction of benzene and methanol, the catalyst has the advantages of a slow inactivation rate, a high benzene conversion rate and high target product selectivity. The modified IM-5 molecular sieve can be used under a high space velocity condition, has high catalysis efficiency, is reactable at a low temperature, shows good activity stability, reduces energy consumption of alkylation, prolongs the service life of the catalyst and is suitable for industrial application.

Description

technical field [0001] The invention relates to a modified IM-5 molecular sieve, a preparation method of the modified IM-5 molecular sieve, and an application of the modified IM-5 molecular sieve in an alkylation reaction. Background technique [0002] In recent years, the synthesis of new molecular sieves using diquaternary ammonium salts as templates has attracted more and more attention. Compared with rigid small molecule templates, diquaternary ammonium salts have unique advantages in the synthesis of molecular sieves with new structures or specific structures due to their higher skeleton charge density and rich deformable properties. [0003] IM-5 molecular sieves were first synthesized by Suk Bong Hong et al. (USP6136290) using pyrrolidine bisquaternary ammonium salt templates. Pore, its pore structure is similar to ZSM-5 molecular sieve, and this molecular sieve also has a 12-membered ring cage structure, which is different from ZSM-5. That The amount of acid and ...

AI Technical Summary

Problems solved by technology

Molecular sieves not only maintain the shape-selective performance and high thermal stability of zeolite molecular sieves, but also have good mass transfer capacity of mesopores, so that the reactants can fully contact with the active components, thereby improving the activity of the catalyst; It quickly diffuses from the active center to the outside of the catalyst, thereby preventing the occurrence of side reactions and improving the life of the catalyst. However, due to the actual large-scale application of this reaction condition, it needs to be quenched to terminate the reaction, which is difficult to control, and there is no industrial application report.

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