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Aromatization catalyst, and preparation method and application thereof

A catalyst and aromatization technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problem of rapid catalyst deactivation and achieve high activity and long-term stability

Inactive Publication Date: 2020-03-17
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And US8772563, US 8692043 and US 8871990 also all fail to solve the problem of rapid catalyst deactivation

Method used

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  • Aromatization catalyst, and preparation method and application thereof
  • Aromatization catalyst, and preparation method and application thereof
  • Aromatization catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] This example is used to illustrate the aromatization catalyst of the present invention and its preparation method.

[0101] 1) Molding

[0102] Mold ZSM-5 (silicon-aluminum ratio 30) and colloidal silica at a mass ratio of 70:30, calcinate at 550°C for 2 hours, pulverize and sieve the calcined product to obtain 20-40 mesh particles.

[0103] 2) modified

[0104] The particles obtained in step 1) were immersed in a hexane solution of tetraethyl orthosilicate at a concentration of 10% by weight, and the resulting mixture was refluxed at 70° C. for 2 hours, the supernatant was removed, and the remaining solid particles were placed in Baking at 550°C for 2 hours;

[0105] Repeating the modification step once, thereby obtaining the modified zeolite;

[0106] According to calculation, the acidity of the outer surface of the modified zeolite is 1.2 μmol / g.

[0107] 3) load

[0108] With 0.05% by weight of Pt(NO 3 ) 2 The aqueous solution impregnated 10g of modified zeol...

Embodiment 2

[0115] This example is used to illustrate the aromatization catalyst of the present invention and its preparation method.

[0116] 1) load

[0117] With 0.05% by weight of Pt(NO 3 ) 2 The aqueous solution impregnation 10g ZSM-5 (silicon aluminum ratio is 50), impregnation time is 2 hours, and temperature is 25 ℃; Afterwards, the resulting mixture is heated to 80 ℃ in rotary evaporator, and rotary evaporation is 60 minutes, obtains dry product, then The product was calcined at 550°C for 2 hours.

[0118] 2) modified

[0119] The calcined product obtained in step 1) is immersed in a hexane solution of tetraethyl orthosilicate with a concentration of 10% by weight, and the resulting mixture is refluxed at 70° C. for 10 hours, the supernatant is removed, and the remaining solid particles are Baking at 550°C for 2 hours;

[0120] Repeat this modification step once, thereby obtain the modified zeolite loaded with platinum,

[0121] According to calculation, the acidity of the ...

Embodiment 3

[0125] This example is used to illustrate the aromatization catalyst of the present invention and its preparation method.

[0126] 1) Modification

[0127] ZSM-5 (with a silicon-aluminum ratio of 50) was immersed in a toluene solution of tetraethylorthosilicate at a concentration of 10% by weight, and the resulting mixture was refluxed at 110 °C for 0.5 h, and then the supernatant was removed by vacuuming , and roasting the remaining solid particles at 550°C for 2 hours;

[0128] Repeating the modification step once to obtain the modified zeolite;

[0129] After calculation, the acidity of the outer surface of the modified zeolite is 1.5 μmol / g.

[0130] 2) Molding

[0131] The modified zeolite powder and pseudo-boehmite were mixed and extruded at a mass ratio of 70:30, and the molded product was roasted at 550°C for 2 hours to obtain strip particles with a diameter of 1.5 mm;

[0132] 3) load

[0133] With 0.05% by weight of Pt(NO 3 ) 2 impregnate 10 g of the carrier w...

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Abstract

The invention relates to the field of production of aromatic hydrocarbons from low-carbon alkanes, and concretely relates to an aromatization catalyst, and a preparation method and an application thereof. The aromatization catalyst comprises a carrier and a metal active component loaded on the carrier, wherein the metal active component comprises platinum, the carrier comprises zeolite and an optional binder, and the acidity of the outer surface of the carrier is not higher than 12 [mu]mol / g. When the aromatization catalyst is applied to an aromatization reaction of light alkane, the yield ofa reaction product BTX can be increased, the selectivity of methane can be correspondingly reduced, and the catalyst has a high activity and a high long-term stability.

Description

technical field [0001] The invention relates to the field of producing aromatics from low-carbon alkanes, in particular to an aromatization catalyst and its preparation method and application. Background technique [0002] Typical noble metal-supported zeolite catalysts are used to catalyze the dehydroaromatization of ethane. In the presence of an aromatization catalyst, light alkanes (such as ethane) can be dehydrogenated and aromatized to produce light aromatics (benzene, toluene, xylene or BTX) and olefin products. At the same time, the process will also Two main products are produced, methane and hydrogen. [0003] The value of methane is very low compared to BTX and olefin products. Also, separating methane and / or hydrogen from ethane and other liquid products is a very energy-intensive process. Unlike other light hydrocarbons, methane conversion is very limited under ethane aromatization reaction conditions, which leads to methane accumulation in the recovery cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J37/02C07C2/76C07C15/04C07C15/06C07C15/08
CPCB01J29/44B01J37/0201B01J37/0018C07C2/76B01J2229/18C07C15/04C07C15/06C07C15/08Y02P20/52
Inventor 王辉约翰·松埠项益智单军军程继红孙琦丽萨·阮
Owner CHNA ENERGY INVESTMENT CORP LTD