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MWW type molecular sieve carrier catalyst and preparation method and application thereof

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

Inactive Publication Date: 2013-04-10
NANJING UNIV OF TECH
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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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  • MWW type molecular sieve carrier catalyst and preparation method and application thereof
  • MWW type molecular sieve carrier catalyst and preparation method and application thereof
  • MWW type molecular sieve carrier catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (a) Take 15 grams of SiO 2 / A1 2 o 3 MCM-22 molecular sieves with a molar ratio of 15 were exchanged into NH by immersing 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) The H-type MCM-22 molecular sieve prepared in step (a) is exchanged with 20 milliliters of 5mol / L alkaline earth metal magnesium nitric acid solution as the exchange liquid, and is exchanged 3 times at 85° C. according to the solid-to-liquid ratio of 10. The exchange time is 2 hours. After washing, suction filtration, 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 type molecular sieve.

[0040] (c) Mg-modified MCM-22 molecular sieve was impregnated with 0.1mol / 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 boric acid and ...

Embodiment 2

[0043] (a) Take 15 grams of SiO 2 / A1 2 o 3 MCM-22 molecular sieves with a molar ratio of 50 were exchanged into NH by immersing 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.

[0044] (b) The H-type MCM-22 molecular sieve prepared in step (a) is exchanged with 20 milliliters of 5mol / L alkaline earth metal magnesium nitric acid solution as the exchange liquid, and is exchanged 3 times at 85° C. according to the solid-to-liquid ratio of 10. The exchange time is 2 hours. After washing, suction filtration, 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 type molecular sieve.

[0045] (c) Mg-modified MCM-22 molecular sieve was impregnated with 0.1mol / 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 boric acid and ...

Embodiment 3

[0048] (a) Take 15 grams of SiO 2 / A1 2 o 3 MCM-49 molecular sieves with a molar ratio of 13 were exchanged into NH by immersing 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 prepared in step (a) with 20 milliliters of 0.1mol / L calcium acetate solution as the exchange solution, and exchange it three times at 60°C according to the solid-to-liquid ratio of 10, each exchange The time is 2 hours. After washing, suction filtration, the filter cake was dried at 110° C. for 4 hours. The molecular sieve was calcined at 400°C for 4 hours to obtain Ca-MCM-49 molecular sieve.

[0050] (c) Ca-modified MCM-49 molecular sieve was impregnated with 1mol / 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 boric acid and alkaline earth metal modified ...

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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, specifically, 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. At the same time, it can also be used in industries such as pharmaceuticals, pesticides, dyes, and mineral processing. 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 of styrene: [0003] The first is ethylbenzene gas-phase catalytic dehydrogenation to styrene. This process uses iron oxide-chromium or zinc oxide as a catalyst, and uses multi-bed adiabati...

Claims

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Application Information

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Patent Type & Authority Applications(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 UNIV OF TECH
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