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Method for preparing small granulated SAPO-34 molecular sieve, product prepared through method, and use of product

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problem of large grain size and achieve high crystallinity and high catalytic performance of the product Effect

Active Publication Date: 2015-02-11
中科催化新技术(大连)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the synthesis cost or purchase cost of conventional SAPO-34 molecular sieves is low, but the grain size is relatively large

Method used

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  • Method for preparing small granulated SAPO-34 molecular sieve, product prepared through method, and use of product
  • Method for preparing small granulated SAPO-34 molecular sieve, product prepared through method, and use of product
  • Method for preparing small granulated SAPO-34 molecular sieve, product prepared through method, and use of product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1: Preparation of SAPO-34 molecular sieve samples (a)~(f) as raw materials

[0072] As the raw material of SAPO molecular sieve, in addition to using SAPO-34 molecular sieve purchased from Zhengda Energy Materials (Dalian) Co., Ltd. (with a particle size ranging from 1 to 10 μm), the following SAPO-34 is also prepared by conventional hydrothermal crystallization method A sample of molecular sieve is used as a raw material.

[0073] Sample (a )

[0074] Add 132g pseudo-boehmite (Al) to the 2L hydrothermal crystallization synthesis kettle 2 O 3 Mass content 72%), 218.5g phosphoric acid (phosphoric acid mass content is 85%), 87g silica sol (SiO 2 Mass content 28%), 290g triethylamine and 740g water, stir evenly, then seal, heat up to 210°C with stirring, and crystallize for 24h. The solid product is separated by centrifugation (Hitachi high-speed centrifuge, centrifugal speed is 10,000 rpm), and the supernatant of the centrifugal separation is collected. The solid prod...

Embodiment 2～9

[0085] Examples 2-9: Preparation of small-crystalline SAPO-34 molecular sieve products

[0086] The commercially available SAPO-34 molecular sieve and the SAPO-34 molecular sieve samples (a) to (f) prepared in Example 1 were used as raw materials, respectively, and pretreated into 10-800 nm particles to obtain crystals with small particle size and low crystallinity. The precursor; then the organic amine template R and water and the optional silicon source, aluminum source and phosphorus source are mixed in a certain proportion to prepare a crystallization solution, or directly used to prepare the above samples (a) to (f) The collected mother liquor is used as the crystallization solution; the above-mentioned crystallization precursor and the crystallization solution are mixed in a certain ratio, and the second crystallization is performed at a certain temperature for a period of time; after centrifugal separation, washing with deionized water, and drying (120°C) In air), the SAPO...

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Abstract

The invention relates to a method for preparing a small granulated SAPO-34 molecular sieve, a product prepared through the method, and a use of the product. The method concretely includes the following steps: preprocessing a raw material SAPO-34 molecular sieve to form granules with the granularity of 10-800nm in order to obtain a crystallization precursor with low crystallization degree; mixing an organic amine template R and water with optional silicon, aluminum and phosphorus sources to prepare a crystallization liquid, or using a mother liquor obtained after separating a product in the preparation process of the SAPO-34 molecular sieve as the crystallization liquid; and mixing the crystallization precursor with the crystallization liquid, carrying out a hydrothermal reaction, and separating to obtain the small granulated SAPO-34 molecular sieve. The method allows the small granulated SAPO-34 molecular sieve to be simply prepared without using an organic amine template tetraethylammonium hydroxide, and the product prepared in the invention has the advantages of obvious prolongation of the catalysis life of a reaction of oxygen-containing compounds, such as methanol, to olefin as a catalyst, and obvious selectivity increase as a catalyst.

Description

Technical field [0001] The present invention relates to the field of molecular sieves and preparation methods thereof, in particular to a method for preparing small-crystalline SAPO-34, products obtained by the method and uses thereof. Background technique [0002] In 1984, United Carbide Corporation (UCC) developed a series of 2 + , AlO 2 - And SiO 2 The tetrahedron forms a new type of silicoaluminophosphate molecular sieve (SAPO-n) with a three-dimensional open framework structure (USP 4,440,871). The Si atom enters the neutral aluminum phosphate framework structure by substitution, so that the framework generates a net negative charge, which causes the proton acidity, thus giving the SAPO molecular sieve catalytic performance. The SAPO-34 molecular sieve has a chabazite-like structure with a small eight-membered ring pore with a size of 0.38nm×0.42nm. Appropriate pore structure, medium-strength acid properties and high hydrothermal stability make SAPO-34 molecular sieve exhib...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C1/20C07C11/02
Inventor 杨淼田鹏刘中民杨越张莹何艳丽杨虹熠
Owner 中科催化新技术(大连)股份有限公司
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