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Method for preparing SAPO-34 molecular sieve with rich Si(4Al) structures and product and application thereof

A SAPO-34, molecular sieve technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, etc. Not easy to deactivate, optimize feeding sequence, improve catalyst life

Active Publication Date: 2013-01-23
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the product SAPO-34 molecular sieve synthesized by this method has low selectivity and total yield in the synthesis of low-carbon olefins ethylene and propylene as a catalyst, and is easy to be deactivated by carbon deposition

Method used

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  • Method for preparing SAPO-34 molecular sieve with rich Si(4Al) structures and product and application thereof
  • Method for preparing SAPO-34 molecular sieve with rich Si(4Al) structures and product and application thereof
  • Method for preparing SAPO-34 molecular sieve with rich Si(4Al) structures and product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] The mixing order of the raw materials is as follows: the aluminum source and the basic composite template are mixed in advance, and then the phosphorus source and the silicon source are added in sequence. Concrete preparation process is as follows:

[0126] Weigh 9.90 g of pseudo-boehmite as an aluminum source, add 20.14 g of water, stir well, and mix for 2 hours. After mixing 18.18 g of triethylamine (TEA) as an organic amine template and 0.08 g of NaF as an auxiliary template, they were added to the pseudo-boehmite solution. Then, 85% H as a phosphorus source 3 PO 4 13.842 g was dissolved in 16.57 g of water, stirred evenly and added to the mixed solution of the aforementioned aluminum source and composite template agent, the reaction was exothermic, and the temperature of the mixed solution rose to 50°C. Dissolve 6.12g of 30% silica sol as a silicon source in 20.06g of water and stir evenly. After the mixture containing phosphorus, aluminum and composite template ...

Embodiment 2

[0132] Embodiment 2: preparation active SAPO-34 molecular sieve catalyst

[0133] The acid-exchanged SAPO-34 molecular sieve raw powders prepared in Example 1 and Comparative Examples 3-8 were calcined at 600°C for 5 hours, pressed into tablets and crushed respectively, and then sieved to obtain the particle size of 20-40 mesh for evaluation.

Embodiment 3

[0134] Embodiment 3: SAPO-34 molecular sieve catalyst evaluation

[0135] Using a fixed-bed catalytic reaction device, the raw SAPO-34 molecular sieve powders obtained in Example 1 and Comparative Examples 3-8 were treated according to Example 2, and evaluation tests were carried out on the obtained catalysts. The experimental conditions are as follows: the catalyst loading is 2g, and N is passed through at 500°C. 2 Activate the catalyst, the reaction temperature is 450°C, the reaction pressure is normal pressure, and the mass space velocity of methanol is 3h -1 , the flow rate of nitrogen is 230ml / min, and the reaction time is defined as the time before the dimethyl ether appears, and the conversion rate of oxygenate is 100%. The results are shown in Table 1.

[0136] Table 1: Evaluation results of obtained molecular sieve catalysts in methanol to olefins reaction

[0137]

[0138] The results in Table 1 show that, compared with Comparative Examples 3 to 8, under the sam...

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Abstract

The invention discloses a method for preparing an SAPO-34 molecular sieve with rich Si(4Al) structures in the skeleton. The raw material mixing sequence is optimized, namely an aluminium source, a fluoride and an organic amine template agent are mixed to form a composite template agent and then a phosphorus source and a silicon source are added in turn to prepare initial gel. By adopting the mixing sequence, aluminium, phosphorus and silicon in the solid micelle and the fluorine-containing organic amine template agent are arranged according to a certain sequence and orientation rule; by increasing the steric hindrances of Al atoms and the substitution probability of Si to P, the SAPO-34 molecular sieve with rich Si(4Al) coordination structures can be prepared; and by adjusting the acid intensity and density, the controllable preparation and stable production of the molecular sieve can be realized. After the SAPO-34 molecular sieve prepared by the method is roasted to remove the template agent and be activated, the molecular sieve has good catalytic activity and higher ethylene / propylene selectivity ratio; and the sum of ethylene selectivity and propylene selectivity is higher, andthe catalyst is difficult to perform coking deactivation and has long life.

Description

technical field [0001] The present invention relates to molecular sieve catalysts, more specifically, the present invention relates to a method for preparing SAPO-34 molecular sieves and the SAPO-34 molecular sieve catalysts obtained by the method and applications thereof. Background technique [0002] Ethylene and propylene are important basic raw materials in the modern chemical industry. The world's annual demand is nearly 200 million tons, and there will still be a large gap in China's domestic production of ethylene and propylene in the next few years. The existing ethylene and propylene production technologies are heavily dependent on petroleum resources. As petroleum is a non-renewable resource with limited reserves and large fluctuations in petroleum prices, countries around the world have begun to devote themselves to the development of low-carbon olefins such as ethylene and propylene produced by non-petroleum routes, so as to broaden raw material channels, adjust ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 邢爱华朱伟平薛云鹏岳国
Owner CHNA ENERGY INVESTMENT CORP LTD
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