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SAPO-34 molecular sieve and synthesis method thereof

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., which can solve the problems of expensive templating agent and unfavorable industrial application

Active Publication Date: 2010-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the price of the template agent is relatively expensive, which is not conducive to industrial application

Method used

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  • SAPO-34 molecular sieve and synthesis method thereof
  • SAPO-34 molecular sieve and synthesis method thereof
  • SAPO-34 molecular sieve and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Raw material is the same as comparative example 1, and raw material is according to: Al 2 o 3 :yP 2 o 5 : zSiO 2 :H 2 The ratio of O:DEA:TEA=1:0.8:0.6:50:0.4:0.6 is fully stirred and mixed evenly. The reaction mixture was packed into a stainless steel crystallization kettle, stirred and crystallized at 180°C and autogenous pressure for 10 hours, then lowered to room temperature, and the remaining diethylamine was added to make the composition of the reaction material into Al 2 o 3 :yP 2 o 5 : zSiO 2 :H 2 O: DEA: TEA = 1: 0.8: 0.6: 50: 1: 0.6, and the temperature was raised to 180° C. to continue crystallization for 38 hours. Then filter, wash, and dry the crystallized product at 100-110°C to obtain the original molecular sieve powder product. Part of the crystallized product was taken for X-ray powder diffraction measurement, and the result showed that the synthesized molecular sieve was SAPO-34 molecular sieve.

[0034] Take part of the above-mentioned mole...

Embodiment 2

[0036] The raw materials are the same as in Comparative Example 1 except the template agent, the template agent is changed to DEA, and the raw materials are changed to: Al 2 o 3 :yP 2 o 5 : zSiO 2 :H 2 The ratio of O:DEA=1:1.0:0.3:40:1 was fully stirred and mixed evenly. The reaction mixture was packed into a stainless steel crystallization kettle, stirred and crystallized at 150°C and autogenous pressure for 15 hours, then lowered to room temperature, and the remaining diethylamine was added to make the composition of the reaction material into Al 2 o 3 :yP 2 o 5 : zSiO 2 :H 2 O: DEA = 1: 1: 0.3: 40: 1.8, and the temperature was raised to 175° C. to continue crystallization for 10 hours. Then filter, wash, and dry the crystallized product at 100-110°C to obtain the original molecular sieve powder product. Part of the crystallized product was taken for X-ray powder diffraction measurement, and the result showed that the synthesized molecular sieve was SAPO-34 molecu...

Embodiment 3

[0039] Raw material is the same as comparative example 1 except template agent, and template agent is changed into TEA and tetraethylammonium hydroxide (TEAOH, 28%), and raw material is pressed: Al 2 o 3 :yP 2 o 5 : zSiO 2 :H 2 The ratio of O:TEA:TEAOH=1:1.1:0.1:50:0.8:0.2 is fully stirred and mixed evenly. The reaction mixture was packed into a stainless steel crystallization kettle, stirred and crystallized at 120°C and autogenous pressure for 5 hours, then lowered to room temperature, and the remaining triethylamine was added to make the composition of the reaction material into Al 2 o 3 :yP 2 o 5 : zSiO 2 :H 2 O: TEA: TEAOH = 1: 1.1: 0.1: 50: 1.4: 0.2, and the temperature was raised to 190° C. to continue crystallization for 8 hours. Then filter, wash, and dry the crystallized product at 100-110°C to obtain the original molecular sieve powder product. Part of the crystallized product was taken for X-ray powder diffraction measurement, and the result showed that ...

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Abstract

The invention provides an SAPO-34 molecular sieve and a synthesis method thereof. A hysteresis loop is arranged between nitrogen adsorption isotherm and desorption isotherm of the molecular sieve; and a molecular sieve crystal comprises topographies such as hollow shells, holes, concave-convex, cracks, nuclear shells and the like. The molecular sieve is obtained by mixing an aluminum source, a phosphorous source, a silicon source and an organic template agent to form gel and hydrothermally crystallizing the gel for 4 to 500 hours at the temperature of between 100 and 250 DEG C, wherein the organic template agent is added in two steps, one part is added during forming the gel, and the rest is added during hydrothermal crystallization. The molecular sieve is a catalyst of active components, can be used for conversion reaction of oxygenated organic compounds, and also can be used for conversion reaction of hydrocarbons, or used as a hydrogen conversion catalyst of hydrocarbons after supporting metals.

Description

technical field [0001] The present invention relates to a silicon-phosphorus-aluminum molecular sieve (SAPO) and a synthesis method thereof, more specifically to a SAPO-34 molecular sieve and a synthesis method thereof. Background technique [0002] The crystal structure of SAPO-34 is similar to chabazite type (CHA), with an ellipsoidal cage composed of eight-membered rings and a three-dimensional pore structure. Its window aperture is 0.38nm, and its spatial symmetry group is R3m. Anderson M W, Sulikowski B, Barrie P J, et al. J Phys Chem, 1990, 94: 2730). The special pore structure and moderate acid strength of SAPO-34 make it outstanding in the catalytic reaction of methanol to olefins. [0003] European Patent EP0103117 firstly reported SAPO-34 molecular sieve and the method of synthesizing SAPO-34 by using tetraethylammonium hydroxide, isopropylamine or a mixture of tetraethylammonium hydroxide and di-n-propylamine as a template. U.S. Patent No. 4,440,871 reports a me...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08
Inventor 李黎声宋守强张凤美
Owner CHINA PETROLEUM & CHEM CORP
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