A kind of IMF structure molecular sieve rich in mesoporous and preparation method thereof

Abstract

The invention discloses a mesopore-rich IMF structure molecular sieve and a preparation method thereof, wherein the mesopore-rich IMF structure molecular sieve has the total specific surface area of 600-700 m<2> / g, the mesoporous specific surface area of 200-300 m<2> / g, and the mesopore volume of 0.26-0.40 ml / g. According to the present invention, the mesopore-rich IMF structure molecular sieve can improve the ring opening rate of polycyclic aromatic hydrocarbons and can reduce the hydrogen transfer reaction in the catalytic cracking of petroleum hydrocarbons or catalytic cracking reactions.

Description

technical field [0001] The invention relates to a mesoporous-rich molecular sieve with IMF structure and a preparation method thereof. Background technique [0002] IM-5 molecular sieve is a molecular sieve with IMF structure, which was first synthesized by Benazzi in 1998. In 2007, the analysis of the structure was completed by Baerlocher et al. The molecular sieve has a two-dimensional ten-membered ring channel structure, and its channel diameter is similar to that of the ZSM-5 molecular sieve, and there is a limited channel in the third dimension. Because of its similar pore structure to ZSM-5 molecular sieve, higher acid content and better hydrothermal stability, it is featured in many catalytic reactions. Corma et al. conducted a series of studies on the catalytic performance of IM-5 molecular sieve and found that it is higher than ZSM-5 molecular sieve in terms of alkane cracking ability. [0003] Although IM-5 molecular sieve can have high alkane cracking ability, ...

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Problems solved by technology

[0003] Although IM-5 molecular sieve can have high alkane cracking ability, it is the same as other ten-membered ring molecular sieves. Due to its narrow pore structure, it is difficult for larger reactant molecules such as polycyclic hydrocarbons to enter the crystal pore for reaction, reducing the The effective reaction area of ​​the molecular sieve reduces the reactivity of the molecular sieve; on the other hand, larger product molecules such as isoparaffins and aromatics are not easy to diffuse out of the pores of the molecular sieve, which causes secondary reactions such as excessive hydrogen transfer and coking, which lead to Molecular sieve deactivation, reduced reaction selectivity