Method for quickly synthesizing SAPO(silicoaluminophosphate)-34 molecular sieve and catalyst prepared from molecular sieve

Abstract

The invention discloses a method for quickly synthesizing an SAPO-34 molecular sieve and a catalyst prepared from the molecular sieve. The method is characterized in that the organic amine with a (CH3)2NR structure is used as a major solvent and a template agent for synthesis to perform molecular sieve synthesis.

Description

technical field [0001] The invention relates to a rapid synthesis method of SAPO-34 molecular sieve. [0002] The invention also relates to the catalytic application of the above-mentioned material in the reaction of converting oxygen-containing compounds into light olefins. Background technique [0003] In 1984, United Carbide Corporation (UCC) developed the SAPO molecular sieve series of silicoaluminophosphate (USP 4440871). The molecular sieve is a kind of crystalline silicoaluminophosphate, and its three-dimensional framework structure is composed of PO 2 + , AlO 2 - and SiO 2 tetrahedron composition. Among them, SAPO-34 is a chabazite-like structure, the main channel is composed of eight rings, and the orifice is 0.38nm×0.38nm. Due to its suitable acidity and pore structure, SAPO-34 molecular sieve has attracted much attention because of its excellent catalytic performance in the reaction of methanol to light olefins (MTO). [0004] SAPO-34 molecular sieves are ...

AI Technical Summary

Problems solved by technology

U.S. Patent 20030231999 reported the use of organic matter containing N, N-dimethylamine groups as a template to synthesize low-silicon SAPO-34 molecular sieves. In this patent, fluoride ions were added to the initial gel system to achieve the synthesis of low-silicon SAPO-34 The purpose of molecular sieves, crystal products cannot be obtained in low-silicon synthesis systems without fluoride ions

In general, the synthetic processes reported in these patents all have long crystallization time and low synthetic yields.

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