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Supported non-metallic catalyst, preparation method and application thereof

A non-metallic catalyst and supported technology, which is applied in the field of preparation, supported non-metallic catalyst, and catalyzed oxidative dehydrogenation of low-carbon alkanes, can solve the problems of low olefin selectivity, etc., and achieves low reaction temperature, simple preparation method, and stability. Good results

Active Publication Date: 2022-05-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the technical problem solved by the present invention is to use existing catalysts to catalyze low-carbon alkanes, olefins have low selectivity, and are easy to catalyze deep oxidation of olefins, thereby providing a supported non-metallic catalyst. The preparation method of the catalyst is simple, with highly dispersed active sites (three-coordinate boron oxide species), used for the oxidative dehydrogenation of low-carbon alkanes, and can have high alkane conversion and olefin yield at lower temperatures, CO 2 The amount of formation is negligible, the active components of the catalyst are not easy to lose, and the stability is good

Method used

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  • Supported non-metallic catalyst, preparation method and application thereof
  • Supported non-metallic catalyst, preparation method and application thereof
  • Supported non-metallic catalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1-1

[0082] Preparation of embodiment 1-1 supported non-metallic catalyst

[0083] (1) Take 467.5 mg of boric acid in a vial, add 5 mL of ethylene glycol, and stir to dissolve at 50 ° C, which is the boron precursor solution;

[0084] (2) Take 1 mL of the above solution and impregnate 1 g of SBA-15, let it stand at room temperature for 2 hours, and oven overnight at 50 ° C. The obtained sample is placed in a muffle furnace and roasted at 700 ° C for 3 hours to obtain 5% by mass B 2 o 3 / SBA-15 catalyst.

Embodiment 1-2

[0085] Preparation of embodiment 1-2 supported non-metallic catalyst

[0086] (1) Take 986.8 mg of boric acid in a vial, add 5 mL of ethylene glycol, and stir to dissolve at 50 ° C, which is the boron precursor solution;

[0087] (2) Take 1 mL of the above solution and impregnate 1 g of SBA-15, let it stand at room temperature for 2 hours, and oven overnight at 50 ° C. The obtained sample is placed in a muffle furnace and roasted at 700 ° C for 3 hours to obtain 10 mass % B 2 o 3 / SBA-15 catalyst, the resulting 10% by mass B 2 o 3 The XRD pattern of / SBA-15 catalyst is as follows figure 1 As shown before the reaction, the NMR spectrum is as diagram 2-1 shown.

Embodiment 1-3

[0088] Preparation of embodiment 1-3 supported non-metallic catalyst

[0089] (1) Take 2.213g of boric acid in a vial, add 5mL of ethylene glycol, and stir to dissolve at 80°C, which is the boron precursor solution;

[0090] (2) Take 1mL of the above solution and impregnate 1g of SBA-15, let it stand at room temperature for 2h, and oven at 50°C overnight. 2 o 3 / SBA-15 catalyst.

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Abstract

The invention relates to a supported non-metallic catalyst, a preparation method and its application in catalyzing the oxidative dehydrogenation of low-carbon alkanes. The supported non-metallic catalyst of the present invention includes boron oxide and silicon oxide, and the boron oxide is supported on silicon oxide, wherein the boron oxide accounts for 0.1-30% by mass. The supported non-metallic catalyst provided by the invention has a simple preparation method, uses porous silicon oxide with weak surface acidity as a carrier, can highly disperse active sites (tricoordinate boron oxide species), and is not easy to catalyze deep oxidation of olefins. The B‑O‑Si bond formed by calcination immobilizes active boron species, making the active components of the catalyst difficult to lose and stable. In catalyzing the oxidative dehydrogenation of low-carbon alkanes, the catalyst has high alkane conversion and alkenes at a relatively low temperature (400°C) due to the abundance of active site tricoordinate boron oxide species and the oxophilicity of its boron site. Yield, CO 2 Generation is negligible.

Description

technical field [0001] The invention relates to the field of industrial catalysis, in particular to a supported non-metallic catalyst, a preparation method and its application in catalyzing the oxidative dehydrogenation of light alkanes. Background technique [0002] Low-carbon olefins are important raw materials for the chemical industry and can be used to produce various chemicals such as high molecular polymers, rubber, and gasoline additives. The traditional production process of light olefins mainly includes steam cracking and catalytic cracking processes from petroleum, which have high reaction temperature, high energy consumption and complicated separation process. And with the increasing demand for low-carbon olefins in the chemical market, the traditional preparation process has been unable to meet the market demand. On the other hand, my country's oil resources are increasingly scarce, and olefin production is facing severe resource pressure. Natural gas, coal-bed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/08B01J29/03C07C5/48C07C11/06
CPCB01J29/0308B01J21/08C07C5/48C07C2521/08C07C2529/03C07C11/06Y02P20/52
Inventor 陆安慧李文翠陆文多
Owner DALIAN UNIV OF TECH
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