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Application of nanosheet sapo molecular sieve aggregates in methanol to olefins reaction

A nanosheet and molecular technology, which is applied in the direction of molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, molecular sieve and alkali exchange phosphate, etc., can solve the problems such as poor performance of SAPO molecular sieve

Active Publication Date: 2021-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the poor performance of existing SAPO molecular sieves in the reaction of methanol to olefins

Method used

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  • Application of nanosheet sapo molecular sieve aggregates in methanol to olefins reaction
  • Application of nanosheet sapo molecular sieve aggregates in methanol to olefins reaction
  • Application of nanosheet sapo molecular sieve aggregates in methanol to olefins reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, 12.3 grams of aluminum isopropoxide was stirred in ammonia solution at 40° C. for 24 hours to obtain solution A; then 5.5 grams of phosphoric acid (85% by weight), 45 grams of deionized water, 60 grams of tetraethylammonium hydroxide (25% by weight) ), 6 grams of silica sol (40% by weight) were successively added into the mixed solution A, and placed in a reaction kettle after being stirred uniformly at 60°C, and crystallized for 1 day at 180°C; the sample was washed after the reaction , drying and roasting to obtain nanosheet SAPO molecular sieve aggregates (99nm long, 78nm wide, and 15nm high).

[0029] The weight ratio of each component is: TEAOH / Al 2 o 3 =10;H 2 O / Al 2 o 3 = 7; SiO 2 / Al 2 o 3=0.4;P 2 o 5 / Al 2 o 3 = 1.1.

[0030] The obtained product was washed, centrifuged, and dried at 110°C to obtain a solid sample. XRD results showed that the obtained product was SAPO-34 molecular sieve powder. see SEM figure 1 , see XRD figure 2 .

Embodiment 2～14

[0032] According to the various steps and conditions of [Example 1], the nanosheet SAPO molecular sieve aggregates were prepared, only the parameters such as the ratio of raw materials (Table 1) and the type of alkali were changed, which are specifically listed in Table 1. Characterization of the synthesized product shows that it has a crystal structure similar to that of [Example 1] and the product, and its specific physical and chemical parameters are shown in Table 1.

[0033] Table 1

[0034]

[0035]

Embodiment 15

[0037] A fixed-bed catalytic reaction device is adopted, and the reactor is a stainless steel tube. The catalyst prepared in Example 1 is evaluated for the reaction activity of methanol conversion to light olefins. The process conditions used for the investigation are: catalyst loading 0.5g, reaction temperature 450 ° C, The reaction pressure is 0.1MPa, the water / raw material weight ratio is 0.25, and the weight space velocity is 1h -1 . Online analysis of all products. The evaluation results are shown in Table 2.

[0038] Table 2

[0039]

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Abstract

The invention relates to the application of nanosheet SAPO molecular sieve aggregates in the reaction of methanol to olefins, and mainly solves the problem of poor performance of SAPO molecular sieves in the prior art in the reaction of methanol to olefins. In the present invention, the sol is obtained by hydrolyzing the mixture of template agent R1, water, phosphorus source, alkali-treated aluminum source and silicon source under the condition of -20°C to 100°C, and then placing it in a reaction kettle for crystallization; crystallization After the completion, wash, dry and roast the samples to obtain the technical scheme of sheet-like silicon-phosphorus-aluminum SAPO molecular sieve aggregates, which better solves this problem and can be used in the industrial production of sheet-like molecular sieves.

Description

technical field [0001] The invention relates to a nanosheet SAPO molecular sieve aggregate, a preparation method and its application in methanol-to-olefin reaction. Background technique [0002] SAPO-34 molecular sieve is a silicoaluminophosphate molecular sieve developed by United Carbide Corporation (UCC), which has suitable acidity and pore structure, large specific surface area, good adsorption performance, thermal stability and hydrothermal stability. At present, it can be said that it is the best catalyst to promote the reaction process of methanol to olefins. However, as a typical gas-solid heterogeneous reaction, the pores of SAPO-34 molecular sieve are prone to carbon deposition due to internal and external diffusion resistance, coupled with the strong exothermic characteristics of the reaction itself, resulting in rapid catalyst deactivation. [0003] In order to solve the above problems, in recent years, researchers have taken a series of measures to improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C1/20C07C11/04C07C11/06B82Y40/00
CPCB01J29/85C01B37/08C01B39/54C01P2002/72C01P2004/03C01P2004/39C01P2004/45C01P2004/64C07C1/20C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 杨贺勤刘志成高焕新
Owner CHINA PETROLEUM & CHEM CORP
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