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Modified Co-based catalyst and preparation method and application thereof, and method for preparing propylene through anaerobic dehydrogenation of propane

A catalyst and modification technology, applied in the field of propane oxygen-free dehydrogenation to propylene, modified Co-based catalyst and its preparation, can solve the problems of poor catalytic activity, poor catalyst stability, poor propane conversion rate and propylene selectivity, etc. Achieve the effects of improving reaction performance, improving dispersion, and improving regeneration stability

Active Publication Date: 2021-08-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above-mentioned supported catalysts reduce the material cost or improve the catalytic effect to a certain extent, there are still problems such as poor propane conversion rate and propylene selectivity, poor catalytic activity or poor catalyst stability.

Method used

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  • Modified Co-based catalyst and preparation method and application thereof, and method for preparing propylene through anaerobic dehydrogenation of propane
  • Modified Co-based catalyst and preparation method and application thereof, and method for preparing propylene through anaerobic dehydrogenation of propane
  • Modified Co-based catalyst and preparation method and application thereof, and method for preparing propylene through anaerobic dehydrogenation of propane

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preparation example Construction

[0063] The present invention also provides a method for preparing the modified Co-based catalyst described in the above technical solution, comprising the following steps:

[0064] a) After mixing the precursor of the auxiliary agent, the carrier Silicalite-1 and the solvent, roasting is carried out to obtain the intermediate M / S-1;

[0065] b) The intermediate M / S-1 is mixed with the precursor of the active component, and then calcined to obtain a modified Co-based catalyst.

[0066] Regarding step a): After mixing the precursor of the auxiliary agent, the carrier Silicalite-1 and the solvent, roasting is carried out to obtain the intermediate M / S-1.

[0067] In the present invention, the type of the auxiliary agent in the precursor of the auxiliary agent is consistent with that described in the previous technical scheme, that is, the metal M and / or the oxide of the metal M, wherein the metal M is selected from Mg, Zr, Nd, W , one or more of La, Ce and Zn. In the present in...

Embodiment 1

[0093] S1. Preparation of carrier Silicalite-1 (referred to as S-1)

[0094] Weigh tetrapropylammonium hydroxide, mix and stir with deionized water at room temperature for 10 minutes, then add tetraethyl orthosilicate dropwise, and age at room temperature for 6 hours. Transfer the obtained mixed solution to a crystallization kettle, crystallize at 100°C for 48h, then cool, centrifuge, wash, dry at 100°C for 10h, and then roast at 550°C for 6h to obtain Silicalite-1 molecular sieve. Wherein, the molar ratio of tetrapropylammonium hydroxide to tetraethyl orthosilicate=1:0.25, the amount ratio of tetraethyl orthosilicate to deionized water=0.25mol:1.5mol.

[0095] S2. Preparation of auxiliary agent-carrier S-1 complex

[0096] Disperse 2 g of the carrier Silicalite-1 in 5 mL of deionized water, add 0.186 g of magnesium nitrate, mix and stir for 6 h, then evaporate the resulting suspension to dryness at 80°C for 1 h, dry at 100°C for 12 h, and roast at 550°C for 6 h. Then the ob...

Embodiment 2

[0102] The preparation process of Example 1 was followed, except that 0.123 g of magnesium nitrate was replaced by 0.051 g of zirconyl nitrate to obtain catalyst 1Zr-Co / S-1.

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Abstract

The invention provides a modified Co-based catalyst and a preparation method and application thereof, and a method for preparing propylene through anaerobic dehydrogenation of propane. The modified Co-based catalyst provided by the invention comprises a carrier Silicalite-1, an active component and an auxiliary agent, wherein the active component and the auxiliary agent are loaded on the carrier; the active component is metal Co and / or an oxide of the metal Co; the auxiliary agent is metal M and / or oxide of the metal M; the metal M is one or more selected from Mg, Zr, Nd, W, La, Ce and Zn. The modified Co-based catalyst is used as a catalyst for preparing propylene through anaerobic dehydrogenation of propane, so side reactions can be effectively avoided, olefin selectivity is improved, the reaction performance of the catalyst for catalyzing anaerobic dehydrogenation of propane is improved, and efficient conversion of propane into propylene is realized; and the regeneration stability of the catalyst is also improved, and high initial activity can still be kept after three times of regeneration.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a modified Co-based catalyst, a preparation method and application thereof, and a method for producing propylene through anaerobic dehydrogenation of propane. Background technique [0002] Propylene is an important product in the petroleum refining process and one of the important raw materials in the chemical production process of downstream products such as polypropylene, polyacrylonitrile and propylene oxide. However, due to the limitation of unstable supply of petroleum resources, the traditional propylene production technology has been difficult to meet the market demand. Therefore, it is imminent to develop new technologies for producing propylene, and propylene production technologies including olefin disproportionation, methanol to olefin, and heavy olefin cracking have received extensive attention. In recent years, a large amount of cheap propane has been produced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C07C5/333C07C11/06
CPCB01J29/0333B01J29/0341C07C5/3335B01J2229/186C07C2529/03C07C11/06Y02P20/52Y02P20/584
Inventor 李宇明姜桂元王雅君于学智于雪
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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