Preparation method of high-purity SAPO-44 microporous molecular sieve

A SAPO-44, microporous molecular sieve technology, applied in the field of molecular sieve preparation, can solve the problems of cumbersome preparation process, increase preparation steps, etc., achieve the effect of short cycle, improve crystallinity, and facilitate industrial application
CN104743574AActive Publication Date: 2015-07-01UNIV OF JINAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF JINAN
Publication Date
2015-07-01

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Abstract

The invention discloses a preparation method of a high-purity SAPO-44 microporous molecular sieve. The method comprises the following steps: preparing mixture gel by taking a phosphorus source, an aluminum source, a silicon source, a composite template agent and water as raw materials, performing closed crystallization on the mixture gel, washing, drying and roasting the obtained crystalized product to remove the composite template agent, to obtain an SAPO-44 microporous sieve, wherein the composite template agent is R1 and R2, the R1 is ethanediamine (EDA), diethylenetriamine (DETA), triethylene tetramine (TETA), tetraethylenepentamine (TEPA) or pentaethylenehexamine (PEHA), and R2 is N,N,N',N'-tetramethyl-1,6-hexamethylenediamine (TMHD). The formation of the SAPO-44 is promoted by using an organic composite template agent, the high-purity SAPO-44 molecular sieve can be obtained only by once crystallization through adjustment of the usage amount, the preparation process is easy to operate, the period is short, and the industrial application is facilitated.
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Description

technical field

[0001] The invention relates to a preparation method of SAPO-44 microporous molecular sieve, in particular to a preparation method of high-purity SAPO-44 microporous molecular sieve, which belongs to the technical field of molecular sieve preparation. Background technique

[0002] Silicoaluminophosphate molecular sieve (SAPO-n) is developed by Union Carbide Corporation of the United States and is composed of SiO 2 、PO 2 + and AlO 2 - Microporous crystals composed of three tetrahedrons, where n represents different crystal structures. There are many types of SAPO series structures, which can be divided into large-pore molecular sieves larger than 50 nm (such as SAPO-5), medium-pore molecular sieves between 2-50 nm (such as SAPO-11) and smaller than 2 nm. Small pore molecular sieves (such as SAPO-34, SAPO-44), etc. The good pore structure makes SAPO-n molecular sieves have excellent shape selectivity, and can be used as catalysts in many hydrocarbon conv...

Claims

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