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Dehydrogenation catalyst and preparation method thereof

A dehydrogenation catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy aggregation of Pt, poor dispersion of Pt, etc., to reduce aggregation, activity and stability. The effect of improved performance and high propylene selectivity

Active Publication Date: 2018-09-28
四川知汇通科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the invention is to solve the deficiencies in the prior art. The purpose of the invention is to overcome the shortcomings of poor Pt dispersion caused by the traditional impregnation method and the easy aggregation of Pt at high temperatures, and to provide a new activity, selectivity and Supported nano-Pt catalyst with improved stability and preparation method thereof, and application in propane dehydrogenation to propylene process

Method used

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  • Dehydrogenation catalyst and preparation method thereof
  • Dehydrogenation catalyst and preparation method thereof
  • Dehydrogenation catalyst and preparation method thereof

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preparation example Construction

[0039] The invention provides a preparation method of a dehydrogenation catalyst, comprising: using Pt nano particle sol as an impregnating solution to impregnate a composite oxide carrier composed of zinc-modified zirconium dioxide and activated alumina.

[0040] Further, the method further includes the following steps: drying, calcining and reducing the impregnated composite oxide carrier composed of zinc-modified zirconia and activated alumina to obtain the dehydrogenation catalyst.

[0041] As a preferred version of the present invention, the dehydrogenation catalyst is obtained through the following preparation process steps, and the steps include:

[0042] (1) Preparation of Pt nanoparticle sol

[0043] a, add deionized water to dissolve in the required amount of surface stabilizer and co-active component compound, and make the surface stabilizer aqueous solution containing co-active component;

[0044] a. Mix the required amount of Pt-containing compound with the aqueous...

Embodiment 1

[0073] (1) Preparation of Pt nano-sol

[0074] Take 0.75g cetyltrimethylammonium bromide (CATB), dissolve it with 50.0mL deionized water, then pipette a certain amount (2.5mL0.10mol / L) of H 2 PtCl 6 The solution was added to the above CATB solution, and stirred at room temperature for 30-40min. Weigh a certain amount of 0.15gNaBH 4 Dissolve in 10mL deionized water to prepare NaBH 4 solution, NaBH was stirred vigorously 4 The solution was added dropwise to H 2 PtCl 6 In the mixed solution with CATB, the dropping rate is 60 drops / min (about 3ml / min), the dropping process is accompanied by a large number of bubbles, and the stirring is continued for 5 hours at room temperature, and the Pt nano-sol can be obtained.

[0075] (2) Carrier preparation

[0076] Add 3kg of deionized water into the stirred tank, start stirring and add 300g of pseudoboehmite powder, after stirring evenly, add zirconium oxychloride, so that the mass ratio of zirconium aluminum to ZrO 2 :Al 2 o 3 ...

Embodiment 2

[0081] (1) Preparation of Pt nano-sol

[0082] Take 0.75g cetyltrimethylammonium bromide (CATB), dissolve it with 50.0mL deionized water, then pipette a certain amount (2.5mL0.10mol / L) of H 2 PtCl 6 The solution was added to the above CATB solution, and stirred at room temperature for 30-40min. Weigh a certain amount of 0.15gNaBH 4 Dissolve in 10mL deionized water to prepare NaBH 4 solution, NaBH was stirred vigorously 4 The solution was added dropwise to H 2 PtCl 6 In the mixed solution with CATB, the dropping rate is 60 drops / min (about 3ml / min), the dropping process is accompanied by a large number of bubbles, and the stirring is continued for 5 hours at room temperature, and the Pt nano-sol can be obtained.

[0083] (2) Carrier preparation

[0084] Add 3kg of deionized water into the stirred tank, start stirring and add 300g of pseudoboehmite powder, after stirring evenly, add zirconium oxychloride, so that the mass ratio of zirconium aluminum to ZrO 2 :Al 2 o 3 ...

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Abstract

The invention belongs to the technical field of a catalyst, and discloses a dehydrogenation catalyst and a preparation method thereof. A composite oxide formed by zinc modified zirconium dioxide and active aluminum oxide is used as a carrier; Pt is used as a major active ingredient; ingredients selected from one or several elements from potassium, magnesium, tin, lanthanum, cerium, ferrum, cobaltand nickel are used as auxiliary active ingredients; Pt nano particle sol is used as steeping liquid for steeping the composite oxide carrier formed by zinc modified zirconium dioxide and active aluminum oxide; the steeped composite oxide carrier formed by zinc modified zirconium dioxide and active aluminum oxide is subjected to drying, baking and reduction to obtain the dehydrogenation catalyst;the aggregation of Pt at high temperature can be obviously reduced; Pt is uniformly distributed in the composite oxide carrier; the active ingredient Pt has large specific surface; the dehydrogenationcatalyst is applied to reaction of preparing propylene through propane dehydrogenation; high propylene selectivity is maintained; meanwhile, the propane conversion rate is obviously improved; the high-temperature stability of the catalyst is also obviously improved.

Description

technical field [0001] The present invention relates to the technical field of chemical industry. The present invention relates to a dehydrogenation catalyst and a preparation method thereof, and furthermore, relates to a dehydrogenation catalyst composed of zinc-modified zirconia and activated alumina with Pt nanoparticles as the active component A dehydrogenation catalyst with a composite oxide as a carrier and a preparation method thereof. Background technique [0002] Propylene is an important basic organic chemical raw material second only to ethylene. It can be used to synthesize materials such as polypropylene, acrylic acid, acrolein and propylene oxide, and can also be used to produce products such as plastics, plexiglass and epoxy resin. There are three main sources of propylene: naphtha steam cracking, refinery FCC by-product and propane dehydrogenation. The first two methods are energy-intensive and must consume non-renewable petroleum resources. Propane dehydro...

Claims

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Application Information

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IPC IPC(8): B01J23/60B01J23/89B01J23/835B01J23/83B01J37/02B01J37/08B01J37/16B01J37/18B01J37/34C07C5/333C07C11/06
CPCB01J23/60B01J23/83B01J23/835B01J23/8913B01J37/0201B01J37/08B01J37/16B01J37/18B01J37/343C07C5/3337C07C11/06Y02P20/52
Inventor 王伟建郑帅
Owner 四川知汇通科技有限公司
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