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Ga-ZSM-5 catalyst as well as preparation method and application thereof

A technology of ga-zsm-5 and catalyst, which is applied in the field of catalysis, can solve the problems of complex preparation process and poor catalyst stability, and achieve the effects of simple process flow, reduced acid strength and good industrialization prospects

Pending Publication Date: 2021-09-28
CHINA NAT OFFSHORE OIL CORP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is complicated, the stability of the prepared catalyst is slightly poor, and the conversion rate of benzene and the selectivity of ethylbenzene need to be further improved.

Method used

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  • Ga-ZSM-5 catalyst as well as preparation method and application thereof
  • Ga-ZSM-5 catalyst as well as preparation method and application thereof
  • Ga-ZSM-5 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] This embodiment provides a method for preparing a Ga-ZSM-5 catalyst. In parts by weight, the raw materials for preparing the Ga-ZSM-5 catalyst include: 75 parts of hydrogen-type Ga-ZSM-5 molecular sieves, binder 25 parts and 1 part of extrusion aid; the binding agent is pseudo-boehmite; the extrusion aid is squash powder;

[0078] Described preparation method comprises the steps:

[0079] (1) mixing hydrogen-type Ga-ZSM-5 molecular sieve, binder and extrusion aid according to the formula to obtain the compound;

[0080] (2) mixing nitric acid with a concentration of 10wt% and the compound obtained in step (1), extrusion molding, the addition of nitric acid is 50% of the mass of the compound; then drying and roasting are carried out successively, and cooled to room temperature to obtain Ga-ZSM -5 catalyst; the drying method includes drying at 100°C for 12 hours; the roasting is at 500°C for 6 hours;

[0081] The preparation method of hydrogen type Ga-ZSM-5 molecular si...

Embodiment 2

[0088] This embodiment provides a method for preparing a Ga-ZSM-5 catalyst. In parts by weight, the raw materials for preparing the Ga-ZSM-5 catalyst include: 70 parts of hydrogen-type Ga-ZSM-5 molecular sieves, binder 30 parts and 0.5 parts of extrusion aid; the binder is γ-Al 2 o 3 ; The extrusion aid is lanthanum nitrate;

[0089] Described preparation method comprises the steps:

[0090] (1) mixing hydrogen-type Ga-ZSM-5 molecular sieve, binder and extrusion aid according to the formula to obtain the compound;

[0091] (2) mixing sulfuric acid with a concentration of 8wt% and the compound obtained in step (1), extrusion molding, the addition of sulfuric acid is 30% of the mass of the compound; then drying and roasting are carried out successively, and cooled to room temperature to obtain Ga-ZSM -5 catalyst; the drying method includes drying at 90°C for 18 hours; the roasting is at 450°C for 8 hours;

[0092] The preparation method of the hydrogen-type Ga-ZSM-5 molecula...

Embodiment 3

[0094] This embodiment provides a method for preparing a Ga-ZSM-5 catalyst. In parts by weight, the raw materials for preparing the Ga-ZSM-5 catalyst include: 80 parts of hydrogen-type Ga-ZSM-5 molecular sieves, a binder 20 parts and 2 parts of extrusion aid; the binder is γ-Al 2 o 3 ; The extrusion aid is cerium nitrate;

[0095] Described preparation method comprises the steps:

[0096] (1) mixing hydrogen-type Ga-ZSM-5 molecular sieve, binder and extrusion aid according to the formula to obtain the compound;

[0097] (2) mixing phosphoric acid with a concentration of 15wt% and the compound obtained in step (1), extrusion molding, the addition of phosphoric acid is 60% of the mass of the compound; then drying and roasting are carried out successively, and cooled to room temperature to obtain Ga-ZSM -5 catalyst; the drying method includes drying at 120°C for 6 hours; the roasting is at 550°C for 4 hours;

[0098] The preparation method of the hydrogen-type Ga-ZSM-5 molecu...

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Abstract

The invention provides a Ga-ZSM-5 catalyst as well as a preparation method and application thereof. The catalyst is of a crisscross sheet structure; and the thickness of the b axis of the Ga-ZSM-5 catalyst is 50 to 500 nm. According to the invention, the structure of the Ga-ZSM-5 molecular sieve is controlled by controlling conditions in the preparation process of the Ga-ZSM-5 catalyst, so the diffusion rate of reactants and products is increased, and the performance of the catalyst is further improved. Moreover, the Ga-ZSM-5 synthesized by the method is of the crisscross sheet structure, and has stable conversion rate, selectivity and longer service life when being used for preparing ethylbenzene through benzene alkylation; and the preparation method provided by the invention also has the advantages of simple process and low cost, and has good industrial prospects.

Description

technical field [0001] The invention belongs to the technical field of catalysis and relates to a ZSM-5 catalyst, in particular to a Ga-ZSM-5 catalyst and its preparation method and application. Background technique [0002] Styrene is an important organic monomer in the petrochemical industry and is widely used in the production of polystyrene, ABS resin, styrene-butadiene rubber and unsaturated polyester resin. Ethylbenzene is the main raw material for the production of styrene, more than 90% is produced by the alkylation of benzene and ethylene, and the rest comes from the separation of C8 petroleum aromatics. [0003] Mobil / Badger jointly developed a gas-phase alkylation process using ZSM-5 zeolite as a catalyst. However, due to the strong acidity of the HZSM-5 catalyst, the by-product xylene content is high; the stability of the catalyst is not high, and the deactivation rate is relatively fast. Therefore, how to develop a new catalyst has become an urgent problem to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C2/66C07C15/073C07C15/02
CPCB01J29/405C07C2/66B01J2229/183C07C2529/40C07C15/073C07C15/02Y02P20/52
Inventor 李孝国张永坤张安峰曹辉常洋郭新闻肖家旺郜金平韩国栋
Owner CHINA NAT OFFSHORE OIL CORP
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