Nano hierarchical pore BEA structure molecular sieve catalyst and preparation method and application thereof

A molecular sieve, multi-level pore technology, applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, molecular sieves and alkali exchange compounds, etc., can solve the problems of short pore channel length, high mesopore pore volume, etc. Conducive to the effect of industrialization promotion

Pending Publication Date: 2021-11-26
JILIN INST OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of this, the present invention provides a molecular sieve catalyst with a nanoscale hierarchical porous BEA structure and its preparation method and application, wherein the molecular sieve catalyst with a nanoscale porous BEA structure has a particle size of nanometer size, a special core-shell structure, a large The specific surface area, shorter pore length and higher mesopore volume can significantly reduce the carbon deposition rate a

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  • Nano hierarchical pore BEA structure molecular sieve catalyst and preparation method and application thereof
  • Nano hierarchical pore BEA structure molecular sieve catalyst and preparation method and application thereof
  • Nano hierarchical pore BEA structure molecular sieve catalyst and preparation method and application thereof

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preparation example Construction

[0057] The embodiment of the present invention discloses a preparation method of a molecular sieve catalyst with a nanoscale hierarchical porous BEA structure, which specifically includes the following steps:

[0058] (1) Add aluminum source, organic template agent and alkali source to deionized water and stir to dissolve, then add silicon source drop by drop under stirring condition, and then continue to stir to obtain sol;

[0059] Among them, the silicon source is one or more mixtures of white carbon black, tetraethyl orthosilicate, and silica sol; the aluminum source is one of aluminum chloride, sodium metaaluminate, and aluminum nitrate; the alkali source is hydroxide Sodium; the organic template is one of tetraethylammonium hydroxide (TEAOH), tetraethylammonium bromide (TEABr), tetraethylammonium chloride (TEACl), tetraethylammonium iodide (TEAI) or A variety of mixtures, more preferably TEAOH; the mass ratio of aluminum source, organic template, alkali source and silico...

Embodiment 1

[0076] Embodiment 1 of the present invention discloses a preparation method of a molecular sieve catalyst with a nanoscale hierarchical porous BEA structure, which specifically includes the following steps:

[0077] (1) In a 250mL three-necked flask, 0.63g of NaAlO 2 Dissolve in 22.09g of TEAOH, and react for 1h at a stirring speed of 1000rpm to obtain a transparent aluminate solution, then add 10.5g of deionized water and 0.43g of NaOH, continue stirring for 0.5h, then add 17.56 g of TEOS, and the stirring speed is 1800rpm during the dropwise addition. After the dropwise addition, stir at room temperature at a rotation speed of 2400rpm for 2h, add 0.80g of polyvinylpyrrolidone, continue to stir for 1h, and finally put the above mixed solution in a water bath at 65°C Evaporate the excess water in the pot to make it reach H 2 O / SiO 2 The mass ratio of is 2.1, thus obtaining a concentrated sol.

[0078] (2) Then transfer the concentrated sol to a polytetrafluoroethylene-lined...

Embodiment 2

[0082] Embodiment 2 of the present invention discloses a preparation method of a molecular sieve catalyst with a nanoscale hierarchical porous BEA structure, which specifically includes the following steps:

[0083] (1) In a 250mL three-necked flask, 0.63g of NaAlO 2 Dissolve in 22.09g of TEAOH, and react for 1h at a stirring speed of 1000rpm to obtain a transparent aluminate solution, then add 10.5g of deionized water and 0.43g of NaOH, continue stirring for 0.5h, then add 17.56 g of TEOS, and the stirring speed is 1800rpm during the dropping process. After the dropping is completed, stir at room temperature at a rotating speed of 2400rpm for 2h, add 1.24g of lysine, and continue stirring for 1h. Finally, put the above mixed solution in a water bath at 65°C Evaporate the excess water in the pot to make it reach H 2 O / SiO 2 The mass ratio of is 2.1, thus obtaining a concentrated sol.

[0084] (2) Then transfer the concentrated sol to a polytetrafluoroethylene-lined stainles...

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Abstract

The invention discloses a nano hierarchical pore BEA structure molecular sieve catalyst as well as a preparation method and application thereof, and relates to the technical field of a catalyst for a process of preparing ethylbenzene by alkylation. The preparation method specifically comprises the following steps: fully mixing a silicon source, an aluminum source, an inorganic alkali source, a template agent, a co-auxiliary agent and deionized water, slowly evaporating excessive water in an aging process to obtain concentrated sol, and performing low-temperature-high-temperature two-stage hydrothermal crystallization to obtain the molecular sieve catalyst. The used co-auxiliary agent is a binary co-auxiliary agent consisting of a water-soluble polyamide and a water-soluble small organic molecule containing amino and carboxyl. The molecular sieve catalyst disclosed by the invention has a BEA framework topological structure, a grain size of 50-200nm, a micropore-mesopore hierarchical pore channel and a core-shell structure, has a relatively high mesopore volume ratio, and shows excellent selectivity and catalytic stability in industrial production of ethylbenzene by liquid phase alkylation of benzene and ethylene.

Description

technical field [0001] The invention relates to the technical field of catalysts for the process of producing ethylbenzene by alkylation, and more specifically relates to a nanometer hierarchical porous BEA structure molecular sieve catalyst and its preparation method and application. Background technique [0002] Ethylbenzene is an important organic chemical raw material, but in the current industrial production of ethylbenzene, only about 2% of ethylbenzene comes from the extraction of C8 aromatics fraction of reformed light oil, and most of the rest is alkylated by benzene and ethylene under the action of a catalyst Reaction preparation. After a long period of development, the alkylation ethylbenzene process has been replaced by the traditional AlCl 3 method and modified AlCl 3 The method has been developed into a production process using various types of solid acids as catalysts. Since the ethylbenzene production process using solid acid as a catalyst is pollution-fre...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J35/02B01J35/10C01B39/02C01B39/04C01B39/48C07C2/66C07C15/073
CPCB01J29/7007C01B39/04C01B39/48C01B39/026B01J35/023B01J35/1023B01J35/0073C07C2/66C07C2529/70C07C15/073
Inventor 张钰展俊岭盛路阳贾明君
Owner JILIN INST OF CHEM TECH
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