SAPO (silicoaluminophosphate) molecular sieve as well as preparation method and application thereof

Abstract

The invention discloses a novel SAPO (silicoaluminophosphate) molecular sieve. An X-ray diffraction spectrum of the novel SAPO molecular sieve comprises following four diffraction peaks: a diffraction peak A, a diffraction peak B, a diffraction peak C and a diffraction peak D, wherein for the diffraction peak A, 2theta is in a range from 12.82 degrees to 13.2 degrees, and peak intensity is IA; for the diffraction peak B, 2theta is in a range from 17.63 degrees to 18.15 degrees, and peak intensity is IB; for the diffraction peak C, 2theta is in a range from 21.80 degrees to 22.40 degrees, and peak intensity is IC; for the diffraction peak D, 2theta is in a range from 25.92 degrees to 26.38 degrees, and peak intensity is ID; the peak intensity IB of the diffraction peak B is the maximum; a peak intensity ratio of each of other diffraction peaks except the diffraction peak A, the diffraction peak C and the diffraction peak D to the diffraction peak B does not exceed 0.07. The SAPO molecular sieve is taken as a catalyst to be applied to an acid catalyzed reaction and a reaction for preparing olefins from an oxygen-containing compound through conversion, and shows good catalysis performance; the SAPO molecular sieve is used for separation of CO2 from CH4 and / or N2 and shows good gas adsorptive separation performance.

Description

technical field [0001] The application relates to a novel SAPO molecular sieve, its synthesis method and application, and belongs to the field of molecular sieves. Background technique [0002] The silicoaluminophosphate molecular sieve (SAPO) series molecular sieves were developed by United Carbide Corporation (UCC) in 1984 (US4440871). 2 , AlO 2 - , PO 2 + A microporous crystal composed of three tetrahedral units. Because the skeleton is negatively charged, there are balance cations outside the skeleton, so it has cation exchange properties. When the cation outside the skeleton is H + When , the molecular sieve has an acidic center, so it will have acid-catalyzed reaction properties. Aluminosilicate molecular sieves have been used as active components of catalysts in the fields of oil refining and petrochemicals, such as catalytic cracking, hydrocracking, isomerization, alkylation of aromatics, conversion of oxygen-containing compounds, etc. [0003] Generally, the ...

AI Technical Summary

Problems solved by technology

In silicoaluminophosphate molecular sieves, due to the highly disordered intergrowth of eutectic molecular sieves, the respective characteristic diffraction peaks are broadened and very weak, which are difficult to identify on the XRD pattern

So far, there are very few reports on the synthesis of SAPO molecular sieves with symbiotic structures except for CHA / AEI materials.

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