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Bicomponent naphtha reforming catalyst and preparation method thereof

A reforming catalyst and catalyst technology, applied in the direction of naphtha catalytic reforming, catalyst activation/preparation, molecular sieve catalyst, etc., can solve the problem of sensitivity to water and sulfur content, low activity of aromatization of low-carbon paraffins, and insufficient stability Ideal and other issues

Active Publication Date: 2011-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the reforming catalysts currently used in industry are double (poly)metallic catalysts with alumina as the carrier and Pt as the main component. The development of this type of reforming catalyst is in a relatively stable period. Their common weakness is that Low carbon paraffins have low aromatization activity
[0003] In the 1980s, people began to research and develop catalytic reforming catalysts containing molecular sieves, the most representative of which is the Pt / KL basic zeolite catalyst, which is difficult for paraffins, especially for traditional reforming catalysts. Chlorinated n-hexane and n-heptane have excellent aromatization activity and selectivity, but are highly sensitive to water and sulfur content in the environment, and their stability is not ideal

Method used

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  • Bicomponent naphtha reforming catalyst and preparation method thereof
  • Bicomponent naphtha reforming catalyst and preparation method thereof
  • Bicomponent naphtha reforming catalyst and preparation method thereof

Examples

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preparation example Construction

[0024] The preparation method of catalyst provided by the invention has three kinds, and the first method comprises:

[0025] (1) Perform ion exchange on borosilicate molecular sieves or low aluminum borosilicate molecular sieves with a solution containing platinum ions, dry, roast, and reduce the solids after exchange to obtain a powdery molecular sieve catalyst,

[0026] (2) Compounds containing platinum group noble metals and VIIB group metal compounds in anions are used to make impregnation solution, impregnating spherical or powdery alumina carrier, drying and roasting the impregnated solid to obtain alumina catalyst,

[0027] (3) The molecular sieve catalyst prepared in step (1) and the alumina catalyst prepared in step (2) are uniformly mixed and shaped according to the mass ratio of 1-9:9-1.

[0028] The second preparation method of catalyst provided by the invention comprises:

[0029] (1) Add extrusion aids to borosilicate molecular sieves or low-aluminum borosilica...

example 1

[0047] (1) Preparation of borosilicate β molecular sieve.

[0048] 1.0g borax, 1.1g sodium hydroxide and 104.7g concentration are the tetraethylammonium hydroxide solution of 25% by mass and mix homogeneously, then add 20g ultramicro silicon dioxide (produced by Cabot company, trade mark CAB-O-SILM-5 ), stirred evenly and moved into the reaction kettle, and crystallized at 140°C for 15 days. After the crystallization is completed, it is rapidly cooled to 40°C. After the product is centrifuged and washed, the obtained solid is dried at 90°C for 10 hours to obtain the original borosilicate β molecular sieve powder. Its anhydrous chemical composition (calculated by oxide molar ratio) is: 0.5 Na 2 O·B 2 o 3 22SiO2 2 .

[0049] (2) Preparation of molecular sieve catalyst.

[0050] Pt(NH 3 ) 4 Cl 2 Prepare an impregnating solution with an appropriate amount of deionized water, so that the impregnating solution contains 1.0% by mass of Pt (relative to the mass of the molecul...

example 2

[0056] (1) Preparation of borosilicate ZSM-5 molecular sieve.

[0057] Mix 3.2g of borax, 2.0g of NaOH, 61g of tetraethylammonium hydroxide solution with a concentration of 10% by mass and 224ml of deionized water evenly, add 50g of ultrafine silicon dioxide under stirring, vigorously stir evenly, and age at 60°C for 4 hours. Move it into a reaction kettle, crystallize at 150°C for 5 days, and then cool it down to 40°C quickly. The product is centrifuged and washed until the pH value is 8-9, and the solid obtained is dried at 120°C for 10 hours to obtain borosilicate ZSM-5 molecular sieve powder. Anhydrous chemical composition (based on oxide molar ratio) is: 0.4Na 2 O·B 2 o 3 ·53SiO2 2 .

[0058] (2) Carry out platinum exchange to the former powder of borosilicate ZSM-5 molecular sieve by the method for example 1 (2), then roast, reduce again, make the borosilicate ZSM- 5 molecular sieve catalyst.

[0059] (3) prepare alumina catalyst by the method for example 1 (3) ste...

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Abstract

The invention relates to a bicomponent naphtha reforming catalyst which comprises a molecular-sieve catalyst and an alumina catalyst, wherein the molecular-sieve catalyst is used for platinum exchange, the carrier of the alumina catalyst is alumina, the mass ratio of the molecular-sieve catalyst to the alumina catalyst is 1-9:9-1, the platinum content in the molecular-sieve catalyst on the calculating basis of a dry-basis molecular sieve is 0.1-2.0 percent by mass, the molecular sieve is a borosilicate molecular sieve or a low-aluminum borosilicate molecular sieve, and the alumina catalyst comprises the following active components with the content on the calculating basis of dry-basis alumina: 0.1-3.0 percent by mass of platinum-family noble metal, 0.1-5.0 percent by mass of VIIB-family metal and 0.5-10.0 percent by mass of halogen. The catalyst is applicable to naphtha catalytic reforming and has higher liquid yield and aromatics yield.

Description

technical field [0001] The invention relates to a naphtha reforming catalyst and a preparation method thereof, in particular to a two-component naphtha reforming catalyst containing molecular sieves and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry and the increasing demand for aromatics in petrochemical industry, especially the increasingly stringent environmental protection standards, catalytic reforming is used to produce high-octane gasoline, light aromatics (benzene, toluene, xylene) and cheap The important refining process of high-quality hydrogen is playing an increasingly important role in the refining and chemical industry. Most of the reforming catalysts currently used in industry are double (poly)metallic catalysts with alumina as the carrier and Pt as the main component. The development of this type of reforming catalyst is in a relatively stable period. Their common weakness is that The aromati...

Claims

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Application Information

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IPC IPC(8): B01J29/86B01J37/00C10G35/09
Inventor 王嘉欣马爱增张大庆陈志祥臧高山张玉红
Owner CHINA PETROLEUM & CHEM CORP
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