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Lamellar ZSM-5 catalyst, and preparation method and application thereof

A technology of ZSM-5 and catalyst, which is applied in the field of layered ZSM-5 catalyst and its preparation, and can solve problems affecting BTX selectivity, etc.

Inactive Publication Date: 2018-06-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too short diffusion paths are not conducive to alkanes in ZSM-5 with a diameter of about Aromatization on the ten-membered ring affects the selectivity of BTX

Method used

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  • Lamellar ZSM-5 catalyst, and preparation method and application thereof
  • Lamellar ZSM-5 catalyst, and preparation method and application thereof
  • Lamellar ZSM-5 catalyst, and preparation method and application thereof

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preparation example Construction

[0035] The invention provides a kind of preparation method of layered ZSM-5 catalyst, comprises the following steps:

[0036] A) Silicon source compound, aluminum source compound, template A, template B, structure aid, alkali and water are (1-100): (1-100): (1-50): (1 ~50): (1 ~ 40): (1 ~ 10): (1 ~ 7000) After mixing, let stand to obtain the precursor aqueous solution;

[0037] Described templating agent A is selected from [C 22 h 45 –N + (CH 3 ) 2 –C 6 h 12 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 4 h 9 ]Br 2 and [C 22 h 45 –N + (CH 3 ) 2 –C 6 h 12 –N + (CH 3 ) 2 –C 4 h 9 ]Br 2 one or more of

[0038] The template agent B is selected from one or more of TPAOH, TPABr, CTAB, triethylamine, ethylenediamine and pyrrolidone homologues;

[0039] The precursor aqueous solution is subjected to hydrothermal crystallizatio...

Embodiment 1

[0073] 12.0g ethyl orthosilicate, 4.1g [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , a certain amount of CTAB, 1.1g of aluminum sulfate, and 0.7g of NaOH were mixed together to form a precursor aqueous solution, and left to stand for 24 hours. After separating the solid and liquid from the reaction material, it was dried at 110°C for 10 hours, and then roasted at 600°C for 6 hours to obtain the initial product; The initial product was stirred in a 1mol / L ammonium nitrate solution for 8 hours, filtered, washed, and this step was repeated 5 times, dried at 110°C for 10 hours, and then calcined at 500°C for 2 hours to obtain a hydrogen-type ZSM-5 molecular sieve; Hydrogen type ZSM-5 molecular sieve was mixed with molybdenum precursor solution, the type of molybdenum was ammonium molybdate, accounting for 1% mass ratio of molecular sieve, placed at room temperature for 12h, and then calcined at 500°C for 2h to obtain ZSM-5 catalyst.

[0074] Where...

Embodiment 2

[0078] 12.0g ethyl orthosilicate, 4.1g [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , 4g of CTAB, a certain amount of aluminum sulfate, and 0.7g of NaOH were mixed and stirred to form a precursor aqueous solution, which was left to stand for 24 hours. After the solid-liquid separation of the reaction material, it was dried at 110°C for 10 hours, and then roasted at 600°C for 6 hours to obtain the initial product; The initial product was stirred in a 1mol / L ammonium nitrate solution for 8 hours, filtered and washed, and this step was repeated 5 times, dried at 110°C for 10 hours, and then roasted at 500°C for 2 hours to obtain a hydrogen-type ZSM-5 molecular sieve; the obtained hydrogen Type ZSM-5 molecular sieve was mixed with molybdenum precursor solution, the type of molybdenum was ammonium molybdate, accounting for 1% mass ratio of molecular sieve, placed at room temperature for 12h, and then calcined at 500°C for 2h to obtain ZSM-5 catalyst....

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Abstract

The invention provides a preparation method of a lamellar ZSM-5 catalyst. Under the action of double template agents, a lamellar ZSM-5 molecular sieve is controllably synthesized by utilizing a function of each template agent. The two template agents have the respective functions: the template agent A is used for synthesizing a lamellar ultrathin molecular sieve, and the template agent B is used for growing the conventional ZSM-5 molecular sieve on the basis of the lamellar molecular sieve. The molecular sieve is characterized by being capable of adjusting and controlling the layer thickness and the Si / Al molar ratio of the lamella ZSM-5 catalyst through controlling the compositional ratio of various raw materials in a precursor solution; the synthesized molecular catalyst has high aromatic hydrocarbon selectivity and carbon deposition resistance on a B acid site, and has high catalytic stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a layered ZSM-5 catalyst and its preparation method and application. Background technique [0002] Benzene, toluene and xylene (BTX) are important industrial basic raw materials (such as: perfume industry, medicine, etc.). BTX is mainly derived from petroleum thermal cracking or naphtha recombination, however, the traditional production methods can no longer meet the increasing market demand for it. The aromatization of short-chain alkanes is more environmentally friendly than traditional production methods, showing broad prospects for the production of BTX. Since the 1990s, alkane aromatization has attracted the attention of academia and industry. [0003] Solid acid catalysis is an important reaction for low-carbon aromatization, and can be used for aromatization reactions in natural gas, petroleum refining, petrochemical and coal chemical industries, and gas co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/46B01J29/48C07C2/76C07C15/04C07C15/06C07C15/08
CPCY02P20/52B01J29/48B01J29/405B01J29/46B01J37/0018B01J2229/18C07C2/76C07C15/04C07C15/06C07C15/08
Inventor 叶嘉辉方岩雄田含晶白磊
Owner GUANGDONG UNIV OF TECH
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