A composite hierarchical porous molecular sieve catalyst for producing aromatics from low-carbon alkanes and its preparation method

A low-carbon alkane and molecular sieve technology, which is applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., to achieve the effects of simple and easy preparation method, excellent low-carbon alkane aromatization performance, and low production cost

Active Publication Date: 2022-05-17
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a composite hierarchical porous molecular sieve catalyst for low-carbon alkanes to aromatics in view of the problems existing in the existing C3-C4 aromatization catalysts

Method used

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  • A composite hierarchical porous molecular sieve catalyst for producing aromatics from low-carbon alkanes and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Synthesis of hierarchical porous molecular sieves:

[0039] Silica sol is used as a silicon source, aluminum nitrate is used as an aluminum source, and tetrapropylammonium bromide is used as a template. SiO 2 :Al 2 o 3 :Na 2 O:TPABr:H 2 The molecular molar ratio of O=1:0.033:0.005:0.06:60 is made into a synthetic solution, and HNO is used 3 Control the pH value at about 11.0, then add carbon nanotubes accounting for 25% of the mass of the silica sol and stir for ~60 minutes; then crystallize in a dynamic crystallization kettle at 170°C for 72 hours to obtain a molecular sieve slurry, which is washed, filtered and dried. Na-ZSM-5 was obtained by calcining at 600°C for 6h under flowing air. Under the condition of liquid-to-mass ratio of 10:1, Na-type molecular sieve and 1mol / L NH 4 NO 3 The solution was exchanged for 3 times, dried, and calcined at 500°C for 4 hours to obtain the required multi-stage HZSM-5 molecular sieve raw material.

[0040] (2) catalyst ...

Embodiment 2

[0046] (1) Synthesis of hierarchical porous molecular sieves:

[0047] Silica sol is used as a silicon source, aluminum nitrate is used as an aluminum source, and tetrapropylammonium bromide is used as a template. SiO 2 :Al 2 o 3 :Na 2 O:TPABr:H 2 The ratio of O=1:0.011:0.005:0.06:60 is made into a synthetic solution, HNO 3 Control the pH value at about 11.0, add mesoporous carbon with 30% silica sol mass and stir for ~60min; the subsequent preparation process is the same as step (1) in Example 1.

[0048] (2) catalyst preparation:

[0049] 1) Mix the weighed multi-stage pore ZSM-5 molecular sieve, MCM-22 molecular sieve with a silicon-aluminum ratio of 25, and gallium nitrate, then add 1.5 times the total mass of deionized water to form a slurry and ball mill in a ball mill; take out the ball mill for 30 minutes and add Deionized water with 4 times the solid mass, and stirred at 70°C for 8h; then the above solution was spray-dried to obtain micropowder, and calcined at...

Embodiment 3

[0054] (1) Synthesis of hierarchical porous molecular sieves:

[0055] Silica sol is used as a silicon source, aluminum nitrate is used as an aluminum source, and tetrapropylammonium bromide is used as a template. SiO 2 :Al 2 o 3 :Na 2 O:TPABr:H 2 The ratio of O=1:0.02:0.005:0.06:60 is made into a synthetic solution, HNO 3 Control the pH value at about 11.0, add carbon nanotubes with 35% silica sol mass and stir for ~60 min; the subsequent preparation process is the same as step (1) in Example 1.

[0056] (2) catalyst preparation:

[0057] 1) Mix the weighed multi-stage pore ZSM-5 molecular sieve, MCM-22 molecular sieve with a silicon-aluminum ratio of 40, and zinc nitrate, then add 2.5 times the total mass of deionized water to form a slurry and ball mill in a ball mill; take out the ball mill for 30 minutes and add 3.5 times the solid mass of deionized water, and stirred at 80°C for 5 hours; then the above solution was spray-dried to obtain micropowder, and calcined a...

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Abstract

The invention belongs to the field of catalysts and their preparation, and relates to a composite hierarchical porous molecular sieve catalyst for producing aromatics from low-carbon alkanes and a preparation method thereof. The catalyst component includes: a multi-level porous HZSM-5 molecular sieve synthesized by a hard template method, a HMCM-22 molecular sieve, a main active component, a noble metal / non-precious metal modifier and a small amount of binder. The catalyst of the invention has excellent low-carbon alkane aromatization performance, simple preparation process, controllable cost and good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of catalysts and their preparation, and relates to a catalyst containing composite hierarchical porous molecular sieves and a preparation method thereof, in particular to a composite hierarchical porous molecular sieve catalyst for producing aromatics from low-carbon alkanes and a preparation method thereof. Background technique [0002] Benzene, toluene and xylene (BTX for short), as important basic organic chemical raw materials, have been widely used in the preparation of various chemical products. Vigorously developing aromatics production is in line with the development trend of traditional oil refineries transforming from fuel-based to chemical-based. In recent years, affected by the rapid development of downstream industries, China's demand for BTX has increased year by year. Although the production of aromatics has been vigorously promoted, a large part of the supply gap still depends on imports. With the inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J35/10C07C2/76C07C15/04C07C15/06C07C15/08C10G50/00
CPCB01J29/80B01J37/0018B01J35/1004C07C2/76C10G50/00B01J29/44B01J29/48B01J29/7476B01J29/7876B01J2229/186C10G2300/1081C10G2300/70C10G2400/30C07C15/04C07C15/06C07C15/08Y02P20/52
Inventor 韩伟潘相米梁衡李南锌艾珍吴砚会李扬何霖
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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