Silicoaluminophosphate molecular sieve catalyst, preparation method, and use thereof

Abstract

The invention relates to a silicoaluminophosphate molecular sieve catalyst, a preparation method, and a use thereof. The invention relates to a preparation method for a silicoaluminophosphate molecular sieve catalyst. The method comprises the following steps: (a) preparing a mixed solution containing a template agent, silicon source, aluminum source, phosphorus source, and a matrix material; (b) optionally, aging the mixed solution; (c) carrying out crystallization for the optionally-aged mixed solution through a hydrothermal crystallization method; (d) optionally, mixing the crystallized mixed solution and a peptizing agent to form a uniform slurry; (e) carrying out a forming treatment for the crystallized mixed solution from the step (c) or the uniform slurry from the step (d) to obtainthe formed product; (f) baking the formed product to obtain the silicoaluminophosphate molecular sieve catalyst. The invention further relates to the silicoaluminophosphate molecular sieve catalyst prepared through the method, the use of the silicoaluminophosphate molecular sieve catalyst as a catalyst for preparation of methanol through olefin, and a method for preparing methanol through olefin.The method provided by the present invention has characteristics of environmental friendliness and low cost.

Description

technical field [0001] The invention provides a silicoaluminophosphate molecular sieve catalyst, especially a SAPO-34 molecular sieve catalyst, its preparation method and application. Background technique [0002] The new series of silicoaluminophosphate molecular sieves (US4440871, US 4499327)-SAPO-n molecular sieves researched and developed by United Carbide Corporation (UCC) in 1984 are based on organic amines as templates, hydrated alumina, phosphoric acid, silicon The sol is an aluminum source, a phosphorus source and a silicon source, and is obtained by first obtaining an organic amine / aluminum phosphate / silicon complex with a microporous phase by hydrothermal crystallization, and then removing the template (organic amine) by roasting. SAPO-34 molecular sieve is one of them, its structure is similar to chabazite, it has three-dimensional intersecting channels, the pore diameter is about 0.38nm, and it belongs to the cubic crystal system. Due to its suitable proton aci...

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Problems solved by technology

Due to the hydrothermal crystallization process of synthesizing molecular sieves, a large amount of crystallization raffinate will be produced. These crystallization raffinate cannot be directly discharged due to the harmful components of organic amines and phosphorus, and the treatment of these raffinate will consume more financial resources, manpower and resources. Material resources and environmental pressure are relatively high

In addition, a large amount of waste liquid will also be produced during the washing and filtering process of molecular sieves, which will also pollute the environment. At the same time, some molecular sieves will be lost during the washing and filtering process, the yield of molecular sieves will decrease, and the cost will increase accordingly.

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