ZSM-22/SAPO-34 composite molecular sieve catalyst and synthetic method thereof

A technology of SAPO-34 and ZSM-22, applied in the field of methanol-to-aromatic compound molecular sieve catalyst and its synthesis, can solve the problems of high BTX yield and low reactivity, and achieve the effects of high reactivity and high aromatics yield

Active Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is the technical problem of low reactivity of a single molecular sieve catalyst in the process of producing aromatics from methanol in the prior art. A new catalyst for producing arom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take by weighing 132g pseudo-boehmite, 80g silica sol (40%), 160g orthophosphoric acid (85%), 90g triethylamine, 50g tetraethylammonium hydroxide and 700g water mix; Weigh 150g H-type ZSM -22 molecular sieves were added to the above mixed solution and stirred evenly; the mixed solution was transferred to a closed high-pressure crystallization kettle and hydrothermally crystallized at 180°C for 60 hours; after the product was taken out, the template agent was removed by washing, drying and roasting to obtain The ZSM-22 / SAPO-34 composite molecular sieve is quantified by XRD diffraction, and the weight content of the SAPO-34 molecular sieve in the product is 50%, and the weight content of the ZSM-22 molecular sieve is 50%.

[0025] Weigh 20g of the above-mentioned ZSM-22 / SAPO-34 composite molecular sieve, mix it with 20g of pseudoboehmite and 1.0g of turnip powder, add an appropriate amount of dilute nitric acid, knead evenly, and then use the extrusion method to shape it. ...

Embodiment 2

[0028]Weigh 20g of the ZSM-22 / SAPO-34 composite molecular sieve prepared in Example 1, mix it with 20g of silica sol (40%wt) and 1.0g of soluble starch, knead it evenly and shape it by extruding, drying and roasting to obtain catalyst precursor. Using the impregnation method, zinc nitrate aqueous solution is used as the impregnation solution, zinc is impregnated on the catalyst precursor, and then dried and roasted to obtain the methanol-to-aromatics catalyst MTA-2 with a Zn mass content of 3%.

[0029] The reactivity evaluation of the catalyst adopts the method of Example 1, and the results are listed in Table 1.

Embodiment 3

[0031] Weigh 20g of the ZSM-22 / SAPO-34 composite molecular sieve prepared in Example 1, mix it with 15g of pseudoboehmite, 5g of fumed silica, and 1g of scallop powder, add an appropriate amount of dilute nitric acid, knead evenly and use The catalyst precursor was obtained by extruding, drying and calcining at 560° C. for 4 hours. Using the impregnation method, the catalyst precursor was impregnated with 3% Zn using zinc nitrate aqueous solution as the impregnation solution, and then dried and calcined at 550°C for 5 hours to obtain the methanol-to-aromatic catalyst MTA-3.

[0032] The reactivity evaluation of the catalyst adopts the method of Example 1, and the results are listed in Table 1.

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Abstract

The invention relates to an aromatic hydrocarbon composite molecular sieve catalyst prepared by methanol and a synthetic method thereof, which mainly solve the problems of low reaction activity of the single molecular sieve catalyst in the prior art. The catalyst comprises the following components in parts by weight: a) 25-85 parts of the ZSM-22/SAPO-34 composite molecular catalyst; b) 1-10 parts of metallic elements; and c) 10-70 parts of a structure promoter. The catalyst can better solve the problem, and can be used for industrial production for producing aromatic hydrocarbons by methanol.

Description

technical field [0001] The invention relates to a catalyst for producing aromatics from methanol and a synthesis method thereof, in particular to a catalyst containing ZSM-22 / SAPO-34 composite molecular sieve and a preparation method thereof. Background technique [0002] Aromatics (in which benzene, toluene and xylene are called B, T and X respectively, and the three are collectively called BTX) are important basic organic chemical raw materials. Aromatics mainly come from catalytic reforming and steam cracking by-product pyrolysis gasoline (nearly 90%)-petroleum route, and only about 10% from coal route. With the development of the economy, BTX aromatics, especially in the Asia-Pacific region, still maintain a strong market demand. However, with the continuous consumption of petroleum resources and rising prices, the cost of producing aromatics from petroleum has risen sharply. Therefore, in the long run, the conversion of coal-based methanol to aromatics is a very promi...

Claims

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Application Information

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IPC IPC(8): B01J29/85
Inventor 陈希强马广伟
Owner CHINA PETROLEUM & CHEM CORP
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