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Preparation method and application of light alkane dehydrogenation catalyst with high thermal stability

A dehydrogenation catalyst, high thermal stability technology, applied in the direction of hydrocarbons, hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of carrier specific surface area decrease, catalyst activity decrease, active component Agglomeration and other problems, to achieve the effect of inhibiting carbon deposition, low probability of sintering and α-phase transformation, and simple preparation process

Inactive Publication Date: 2015-01-21
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, since the dehydrogenation reaction is carried out at a high temperature of about 600°C, and the catalyst needs to undergo multiple high-temperature charcoal regenerations, the γ-Al 2 o 3 The carrier is prone to sintering and α-phase transformation, which greatly reduces the specific surface area of ​​the carrier, destroys the pore structure, and then the active components of the catalyst gather, and the catalyst activity is severely reduced. Therefore, it is necessary to use γ-Al 2 o 3 The carrier is further modified to make the catalyst have higher thermal stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The catalyst preparation process is as follows:

[0023] Step a. Add aluminum sulfate to NaOH aqueous solution, stir, continue to drop NaOH aqueous solution to adjust the pH of the mixed solution to 12, filter, wash with deionized water, add dilute nitric acid to form a sol, then add sodium silicate, stir, and filter , aged for 40 hours, formed into drop balls, and then dried at 120°C for 2 hours; roasted at 600°C for 3 hours to obtain Si-containing γ-Al 2 o 3 small ball;

[0024]Step b. γ-Al containing Si element obtained in step a 2 o 3 Immerse the small ball carrier in aqueous solution of lanthanum nitrate at 80°C for 4h, then dry at 120°C for 2h; roast at 450°C for 8h; then dip in aqueous solution of sodium chloride at 80°C for 4h, then dry at 120°C for 2h; ℃, roasting for 8h;

[0025] Step c. γ-Al containing Si elements loaded with La and Na elements obtained in step b 2 o 3 The small ball carrier was impregnated with chloroplatinic acid aqueous solution, ti...

Embodiment 2

[0030] The catalyst preparation process is as follows:

[0031] Step a. Add aluminum trichloride to the KOH aqueous solution, stir, continue to drop the KOH aqueous solution to adjust the pH of the mixed solution to 8, filter, wash with deionized water, add dilute nitric acid to form a sol, and then add ethyl orthosilicate , stirred, filtered, aged for 15 hours, formed into drop balls, and then dried at 100°C for 5 hours; roasted at 450°C for 8 hours to obtain Si-containing γ-Al 2 o 3 small ball;

[0032] Step b. γ-Al containing Si element obtained in step a 2 o 3 The pellet carrier was impregnated with cerium nitrate aqueous solution at 90°C for 3h, then dried at 100°C for 5h; calcined at 550°C for 5h; then at 90°C, immersed in magnesium chloride aqueous solution for 3h, and then dried at 120°C for 2h; at 550°C, Roasting 5h;

[0033] Step c. γ-Al containing Si elements loaded with Ce elements and Mg elements obtained in step b 2 o 3 The small ball carrier was impregnat...

Embodiment 3

[0038] The catalyst preparation process is as follows:

[0039] Step a. Add aluminum nitrate to the ammonia solution, stir, continue to drop the ammonia solution to adjust the pH of the mixed solution to 10, filter, wash with deionized water, add dilute nitric acid to form a sol, then add silica sol, stir, filter, Aging for 24 hours, forming drop balls, then drying at 80°C for 10 hours; roasting at 550°C for 5 hours to obtain Si-containing γ-Al 2 o 3 small ball;

[0040] Step b. Using the Si-containing γ-Al obtained in step a 2 o 3 Immerse the small ball carrier in aqueous solution of lanthanum nitrate at 70°C for 6 hours, then dry at 80°C for 10 hours; roast at 500°C for 6 hours; then impregnate the aqueous solution of potassium nitrate at 70°C for 6 hours, then dry at 80°C for 10 hours; , roasted for 6h;

[0041] Step c. Si element-containing γ-Al loaded with La and K elements obtained in step b 2 o 3 The small ball carrier was impregnated with chloroplatinic acid aqu...

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Abstract

The invention discloses a preparation method and application of a light alkane dehydrogenation catalyst with high thermal stability. The light alkane dehydrogenation catalyst with high thermal stability is a PtSn load-type catalyst which uses Si-containing gamma-Al2O3 pellets as a carrier, and the catalyst also contains rare-earth metal elements, alkali metal elements and / or alkaline earth metal elements as auxiliaries; an element Si in the Si-containing gamma-Al2O3 pellet carrier accounts for 0.1-30 percent by weight; based on the weight of the Si-containing gamma-Al2O3 pellet carrier, the content of an element Pt loaded on the carrier is 0.3-0.5 percent by weight, the content of an element Sn is 0.6-1.0 percent by weight, the content of the rare-earth metal elements is 0.8-1.0 percent by weight, and the content of the alkali metal elements or the alkaline earth metal elements is 0.2-1.0 percent by weight. The catalyst is suitable for being used under light alkane dehydrogenation process conditions such as high temperature, long time and multiple regeneration, and is high in light alkane conversion rate and stability.

Description

technical field [0001] The invention relates to a preparation method and application of a low-carbon alkane dehydrogenation catalyst with high thermal stability, which is suitable for gas-solid phase catalytic reactions and belongs to the catalyst preparation technology in the technical field of industrial catalysts. Background technique [0002] The catalytic dehydrogenation of light alkanes to the corresponding olefins is an important petrochemical process. As a product of catalytic dehydrogenation of low-carbon alkanes, ethylene is an important chemical in the petrochemical industry; propylene is widely used in the preparation of polymer materials such as polypropylene and polyacrylonitrile; isobutylene is also an important chemical raw material for synthetic rubber , butyl rubber and polyisobutylene and other fine chemicals. my country is rich in low-carbon alkane resources, but most of them are used as civil fuels and have not been fully utilized, resulting in a great ...

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 黄力王向华吴沛成刘宽周钰明张建国孙勇白静玄徐隽王丽
Owner 南京沃来德能源科技有限公司
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