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Process for prepareing SAPO-34 molecular siever

A technology of SAPO-34 and molecular sieve, applied in the field of preparation of SAPO-34 molecular sieve, can solve the problems of low crystallinity, small synthesis range, complex molecular sieve process, etc., and achieves improved catalytic activity, reduced synthesis cost, and simplified synthesis of molecular sieve by gas phase method. Effect

Inactive Publication Date: 2005-11-09
NANJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the complicated process of preparing molecular sieves by the above-mentioned method, which requires the use of a large amount of organic amine templates, and is suitable for preparing SAPO-34 molecular sieves with a relatively small synthesis range of silicon-aluminum ratio and phosphorus-aluminum ratio, and relatively low crystallinity. Insufficiently, a method for preparing SAPO-34 molecular sieves with a higher crystallinity than the general gas-phase method was proposed by introducing an organic amine template when preparing dry glue, and the range of phosphorus-aluminum ratio becomes larger.

Method used

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  • Process for prepareing SAPO-34 molecular siever

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Effect test

Embodiment 1

[0024] Add 5.0g of aluminum isopropoxide to 13.95g of deionized water, stir vigorously, add 2.82g of phosphoric acid with a mass percentage of 85%, continue stirring for a period of time, and then add 3.06g of 30% by mass to it while stirring Silica sol (Jiangyin Guolian Chemical Industry), finally add 1.54g triethylamine. The ratio of each component is:

[0025] 1.25SiO2 2 : Al 2 o 3 : 1.0P 2 o 5 : 75H 2 O: 1.25Nt 3 N (triethylamine) After the synthesis solution is completely mixed, move it into a 40°C oven to evaporate the water to form dry glue, then grind the dry glue into powder, and place it on the upper part of the reaction kettle lined with polytetrafluoroethylene. At the same time, a mixture of water and morpholine (50:1.0 in molar ratio) was added to the bottom of the reaction kettle. After sealing, put it in a 170°C oven for gas phase reaction for 48 hours, and cool it in a natural state after the reaction. Finally, the sample is taken out, washed, dried an...

Embodiment 2

[0028] Add 3.06g of silica sol with a mass percentage of 30% to 5.0g of aluminum isopropoxide, stir it mechanically to make it evenly mixed, then add 1.76g of phosphoric acid with a mass percentage of 85%, and after fully mixing evenly, finally add 1.54g of three Ethylamine. The ratio of each component is:

[0029] 1.25SiO2 2 : Al 2 o 3 : 1.0P 2 o 5 : 1.25Et 3 The molecular sieve synthesis precursor obtained by N (triethylamine) does not need to be heated and evaporated to dryness, and is directly placed on the upper part of the reactor lined with polytetrafluoroethylene. )mixture. After sealing, place it in an oven at 170°C for 48 hours, and cool it in a natural state after the reaction. Finally, the sample is taken out, washed, dried and calcined to obtain the molecular sieve.

[0030] The samples were characterized by XRD, with and figure 1 The same crystal form has a crystallinity of 121%.

Embodiment 3

[0032] According to the preparation method and steps of Example 1, but change the organic amine species of the liquid phase part during the gas phase reaction, the liquid phase part is a mixture of water and triethylamine (the molar ratio is 10: 1.0), and the SAPO-34 molecular sieve crystallinity obtained at last 85%.

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Abstract

A process for preparing molecular sieve SAPO-34 includes such steps as adding deionized water to the container with stirrer, proportionally and sequentially adding the compounds of Al, P and Si and organic amine while stirring, evaporating water in baker to obtain dried substance, putting it on the upper position of a gas-phase reactor, filling the mixture of organic amine and water into its bottom, reaction, cooling, washing, drying and calcining.

Description

Technical field: [0001] The invention relates to a preparation method of SAPO-34 molecular sieve, in particular to a method for preparing SAPO-34 molecular sieve by gas phase method. Background technique: [0002] In 1984, Union Carbide Corporation of the United States developed a series of silicoaluminophosphate molecular sieves, among which SAPO-34 molecular sieve has a chabazite-like structure and belongs to small-pore zeolites, which can be used as adsorbents, catalysts and catalyst carriers. It shows very good catalytic activity in the reaction of methane to olefins (MTO), the selectivity of low-carbon olefins is as high as more than 90%, and the selectivity of ethylene can reach more than 50%, and there are almost no products above C5. The traditional method for preparing molecular sieves is prepared by hydrothermal method (USP4440871, CN1037334C, CN1038125C, CN1048428C, CN1088483A). The preparation process of molecular sieves by hydrothermal method is relatively compl...

Claims

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Application Information

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IPC IPC(8): C01B37/08
Inventor 张利雄姚建峰曾昌凤徐南平
Owner NANJING UNIV OF TECH
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