Method for synthesizing CoAPO-41 molecular sieve

Abstract

The invention discloses a method for synthesizing a CoAPO-41 molecular sieve and relates to a method for synthesizing a molecular sieve. The invention aims at solving the problems that relatively high acid site density cannot be formed without introducing a large quantity of Si atoms in the existing synthesis process of an SAPO-41 molecular sieve, but the Si atoms hardly enter the molecular sieve framework and are uniformly distributed on the framework to form a non-framework amorphous species which deposits in the pore orifices or pore channels of the molecular sieve to cause partial blocking of the pore orifices or pore channels. The method comprises the following steps: (I) preparing initial gel; and (II) crystallizing and roasting to obtain the CoAPO-41 molecular sieve. In the invention, the prepared CoAPO-41 molecular sieve is a spherical aggregate or crystal cluster consisting of nano rods, wherein the crystallizing time is only (1 / 2)-(1 / 3) of that of the prior art while mixed crystals are avoided; and the CoAPO-41 molecular sieve can be applied to the fields such as petrochemical industry as an environment-friendly acid catalyst.

Description

technical field [0001] The present invention relates to a method for synthesizing molecular sieves. Background technique [0002] In the synthesis process of the existing SAPO-41 molecular sieve, a large number of Si atoms must be introduced to form a high acid site density, but it is difficult for Si atoms to enter the molecular sieve framework and evenly distribute on the framework to form non-framework amorphous species, so they are deposited in the pores of the molecular sieve At the mouth or in the channel, causing a partial blockage of the orifice or channel. [0003] CoAPO-41 is a molecular sieve with an AFO topology formed by partially isomorphously replacing the skeleton P in the AlPO-41 aluminum phosphate molecular sieve with Co or P and Al, and has a one-dimensional elliptical ten-membered ring channel. [0004] AlPO-41 is composed of AlO 4 with PO 4 Aluminum phosphate molecular sieves with AFO-type topology composed of alternating tetrahedrons have a balanced ...

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Problems solved by technology

[0005] The present invention aims to solve the problem that a large number of Si atoms must be introduced in the synthesis process of the existing SAPO-41 molecular sieve to form a higher acid site density, but it is difficult for Si atoms to enter the molecular sieve framework and evenly distribute on the framework to form non-framework amorphous species, thus depositing At the orifice or channel of the molecular sieve, the problem of partial blockage of the orifice or channel is caused, and a method for synthesizing CoAPO-41 molecular sieve is provided

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