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A kind of MWW type molecular sieve carrier catalyst and its preparation method and application

A molecular sieve and catalyst technology, which is applied in the field of modified molecular sieve catalysts, can solve the problems that the catalyst cannot meet the industrial requirements, the structure is easily damaged, and the stability of the catalyst is poor.

Inactive Publication Date: 2015-07-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Although the above two methods have improved the conversion rate of toluene and the selectivity of styrene to a certain extent, the catalysts prepared by the above patented methods still cannot meet the industrial requirements, and there are disadvantages such as easy structure damage and poor catalyst stability.

Method used

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  • A kind of MWW type molecular sieve carrier catalyst and its preparation method and application
  • A kind of MWW type molecular sieve carrier catalyst and its preparation method and application
  • A kind of MWW type molecular sieve carrier catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (a) Take 15 grams of SiO 2 / A1 2 O 3 MCM-22 molecular sieve with a molar ratio of 15 was exchanged for NH by immersion in 20 ml of 0.1 mol / L ammonium nitrate solution at 85 °C for 8 hours 4 type molecular sieve, and then calcined at 550 ° C for 4 hours to obtain H type MCM-22 molecular sieve.

[0039] (b) exchange the H-type MCM-22 molecular sieve obtained in step (a) with 20 milliliters of nitric acid solution of 5mol / L alkaline earth metal magnesium as an exchange liquid, and exchange 3 times according to the solid-to-liquid ratio at 85°C for 10 times. The exchange time is 2 hours. After washing, suction filtration, and the filter cake was dried at 110° C. for 4 hours. The molecular sieve was calcined at 550°C for 4 hours to obtain Mg-MCM-22 molecular sieve.

[0040] (c) Mg-modified MCM-22 molecular sieves were impregnated with 0.1 mol / L boric acid solution at 25°C for 6 hours, dried at 120°C for 8 hours, and calcined at 550°C for 3 hours to obtain MCM-22 molecul...

Embodiment 2

[0043] (a) Take 15 grams of SiO 2 / A1 2 O 3 MCM-22 molecular sieve with a molar ratio of 50 was exchanged for NH with 20 ml of 0.1 mol / L ammonium nitrate solution, immersed at 85 °C for 8 hours 4 type molecular sieve, and then calcined at 550 ° C for 4 hours to obtain H type MCM-22 molecular sieve.

[0044] (b) exchange the H-type MCM-22 molecular sieve obtained in step (a) with 20 milliliters of nitric acid solution of 5mol / L alkaline earth metal magnesium as an exchange liquid, and exchange 3 times according to the solid-to-liquid ratio at 85°C for 10 times. The exchange time is 2 hours. After washing, suction filtration, and the filter cake was dried at 110° C. for 4 hours. The molecular sieve was calcined at 550°C for 4 hours to obtain Mg-MCM-22 molecular sieve.

[0045] (c) Mg-modified MCM-22 molecular sieves were impregnated with 0.1 mol / L boric acid solution at 25°C for 6 hours, dried at 120°C for 8 hours, and calcined at 550°C for 3 hours to obtain MCM-22 molecula...

Embodiment 3

[0048] (a) Take 15 grams of SiO 2 / A1 2 O 3 MCM-49 molecular sieve with a molar ratio of 13 was exchanged into NH by immersion in 20 ml of 5 mol / L ammonium nitrate solution at 60 °C for 8 hours 4 type molecular sieve, and then calcined at 400°C for 4 hours to obtain H type MCM-49 molecular sieve.

[0049] (b) exchange the H-type MCM-49 molecular sieve obtained in step (a) with 20 ml of 0.1 mol / L calcium acetate solution as the exchange liquid, and exchange three times at 60°C according to the solid-liquid ratio of 10, each exchange The time is 2 hours. After washing, suction filtration, and the filter cake was dried at 110° C. for 4 hours. The molecular sieve was calcined at 400° C. for 4 hours to obtain a Ca-MCM-49 molecular sieve.

[0050] (c) Ca-modified MCM-49 molecular sieves were impregnated with 1 mol / L boric acid solution at 25°C for 6 hours, dried at 120°C for 8 hours, and calcined at 400°C for 3 hours to obtain MCM-49 molecular sieves modified with boric acid an...

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Abstract

The invention discloses an MWW type molecular sieve carrier catalyst and a preparation method and an application thereof, namely a catalyst for the alkylation reaction of toluene and carbinol side chains and a preparation method and an application of the same. The MWW type molecular sieve carrier catalyst comprises a carrier body, and a boron element and alkali-earth metal which are loaded on the carrier body. The preparation method comprises the following steps of: (a) exchanging ammonium salt, and baking into an H-type MWW type molecular sieve; (b) exchanging alkaline-earth metal salt by exchange liquid; and (c) baking, and loading on the molecular sieve by a boric acid solution impregnation method to obtain the MWW type molecular sieve carrier catalyst. The catalyst prepared by the method has excellent hydrothermal stability and special acid site distribution, the alkalinity of the catalyst can be enhanced, and the catalytic activity and selectivity can be improved. The MWW type molecular sieve is modified by alkaline-earth metal oxide through the impregnation method, the acid-alkali property of the MWW type molecular sieve can be modulated, and the novel catalyst having acid-alkali double functions is prepared.

Description

technical field [0001] The present invention relates to a modified molecular sieve catalyst, its preparation method and application, in particular, a catalyst for toluene methanol side chain alkylation reaction, its preparation method and application. Background technique [0002] As an important basic raw material in the petrochemical industry, styrene has a wide range of uses. It is mainly used in the production of styrene series resins and styrene-butadiene rubber. It can also be used in pharmaceuticals, pesticides, dyes and mineral processing industries. With the rapid development of my country's building materials, home appliances and automobile industries, my country's demand for styrene will continue to grow rapidly. There are three main production routes for styrene: [0003] One is the gas-phase catalytic dehydrogenation of ethylbenzene to produce styrene. This process uses iron oxide-chromium or zinc oxide as a catalyst and uses a multi-bed adiabatic or tubular is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J32/00C07C2/86C07C15/46
Inventor 任晓乾梁金花孙守飞张文飞姜岷
Owner NANJING TECH UNIV
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