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Catalyst for catalytic dehydrogenation of alkane and preparation method and application thereof

A dehydrogenation catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., to achieve optimal utilization, alleviate demand aggravation, significant social benefits and economic benefit effect

Inactive Publication Date: 2012-10-03
南京沃来德能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an excessively high reaction temperature not only intensifies the alkane cracking reaction and deep dehydrogenation, but also reduces the selectivity; at the same time, it also accelerates the carbon deposition on the surface of the catalyst, causing the catalyst to deactivate rapidly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Spherical γ-Al used in the present invention 2 o 3 The carrier is prepared by the known drop ball molding method, and is dried at 120°C, and γ-Al is calcined at 600°C 2 o 3 Small balls, the average diameter of the small balls is 2mm.

[0039] The above γ-Al 2 o 3 10 g of pellets are first impregnated with a liquid prepared from 17.5 ml of distilled water and 2.5 ml of lanthanum nitrate solution with a concentration of 40 mgLa / ml, so that the carrier is loaded with metal La ions. Dry at 150°C for 4 hours, and bake at 550°C for 5 hours.

[0040] Using the above-mentioned loaded metal La ion γ-Al 2 o 3 The pellet carrier is then impregnated with a liquid prepared from 16 ml of distilled water and 4 ml of a sodium chloride solution with a concentration of 25 mgNa / ml, so that the carrier is loaded with alkali metal sodium ions. Dry at 150°C for 5 hours, and bake at 550°C for 5 hours.

[0041] Using the above-mentioned γ-Al loaded with metal La ions and alkali metal ...

Embodiment 2

[0043] The above γ-Al 2 o 3 10g pellets with 6.0ml distilled water and 12.5mgPt / ml chloroplatinic acid solution 4ml, 25mgNa / ml sodium chloride solution 4ml, 40mgLa / ml lanthanum nitrate solution 2.5ml and 40mgSn / ml tin chloride Solution 2.5ml and 1ml hydrochloric acid solution with a concentration of 5% are impregnated, dried at 150°C for 5 hours, calcined at 550°C for 5 hours, and then reduced in hydrogen at 500°C for 10 hours. Obtain catalyst B, calculate by the mass of catalyzer, the mass percentage composition of this catalyst containing platinum is: 0.5%, the mass percentage composition containing tin is: 1.0%; The mass percentage composition containing alkali metal sodium is: 1.0%, The mass percentage of rare earth element lanthanum is 1.0, and the mass percentage of chlorine is 0.1%.

Embodiment 3

[0045] The above γ-Al 2 o 3 10g pellets with 9.5ml distilled water and 10mgPt / ml chloroplatinic acid solution 3ml, 25mgNa / ml sodium chloride solution 3ml, 40mgLa / ml lanthanum nitrate solution 2ml and 40mgSn / ml tin chloride solution 1.5 ml and 1ml of hydrochloric acid solution with a concentration of 5% is impregnated, dried at 80°C for 8 hours, calcined at 450°C for 8 hours, and then reduced in hydrogen at 550°C for 5 hours. Obtain catalyst C, calculate by the mass of catalyzer, the mass percentage composition of this catalyst containing platinum is: 0.3%, the mass percentage composition containing tin is: 0.6%; The mass percentage composition containing alkali metal sodium is: 0.75%, The mass percentage of rare earth element lanthanum is 0.8%, and the mass percentage of chlorine is 0.2%.

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Abstract

The invention relates to a catalyst for catalytic dehydrogenation of low-carbon alkane. The gamma-Al2O3 is used as the carrier, wherein the carrier has the bulk density of 0.4-0.6g / ml and the specific surface area of 100-300m<2> / g; the active component which is Pt is supported on the carrier; the Sn, the Na and the La are used as assistants, and the Cl is used as a modifier; the content of the Pt accounts for 0.3-0.5% of the mass of the catalyst, the content of the Sn accounts for 0.6-1.0%, the content of the Na accounts for 0.75-1.0%, the content of the La accounts for 0.8-1.0%, and the content of the Cl accounts for 0.1-0.2%. The process for preparing the corresponding olefin by using the catalyst for dehydrogenation of low-carbon alkane comprises the following steps: adding the precursor of the catalyst into a reactor, introducing hydrogen, reducing the precursor of the catalyst for 1-10 hours at 400-600 DEG C, introducing preheated mixture of low-carbon alkane, hydrogen and steam, and carrying out the dehydrogenation reaction of low-carbon alkane at 500-700 DEG C. The isobutene prepared by adopting the process and the catalyst through dehydrogenation of isobutene has the average conversion rate of more than 30% and the selectivity of more than 95% and can retain for more than 40 days.

Description

technical field [0001] The invention relates to a catalyst used for catalytic dehydrogenation of light alkanes to prepare corresponding olefins, a preparation method and a catalytic dehydrogenation process, especially a production process for isobutane dehydrogenation to produce isobutene. Background technique [0002] Catalytic dehydrogenation of light alkanes to corresponding olefins is an important petrochemical process, among which the dehydrogenation of propane and isobutane to propylene and isobutene is particularly important. Propylene is an organic chemical raw material for the production of polypropylene, acrylonitrile and propylene oxide. In recent years, with the rapid growth of the demand for derivatives such as polypropylene, the demand for propylene is also expanding. Isobutylene is also an important chemical raw material, widely used in various organic chemical raw materials and fine chemicals such as synthetic rubber, butyl rubber and polyisobutylene. my c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63C07C11/06C07C11/09C07C11/04C07C5/333
CPCY02P20/52
Inventor 李庆宁王向华黄力田晓明徐隽白静玄周钰明张一卫张建国刘宽吴沛成
Owner 南京沃来德能源科技有限公司
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