Metal@BN core-shell structure nanometer catalyst for synthesis gas methanation reaction, and preparation method thereof

A nano-catalyst and metal nano-particle technology, applied in physical/chemical process catalysts, chemical instruments and methods, and hydrocarbon production from carbon oxides, etc., can solve complex catalyst preparation methods, unsuitable for large-scale preparation, catalyst deactivation, etc. problems, to achieve the effects of avoiding catalyst deactivation, preventing sintering and loss, high and low temperature activity and high temperature stability

Active Publication Date: 2016-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Second, metal sintering leads to catalyst deactivation
Third, metal loss leads to catalyst deactivation
However, the preparation method of th

Method used

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  • Metal@BN core-shell structure nanometer catalyst for synthesis gas methanation reaction, and preparation method thereof
  • Metal@BN core-shell structure nanometer catalyst for synthesis gas methanation reaction, and preparation method thereof
  • Metal@BN core-shell structure nanometer catalyst for synthesis gas methanation reaction, and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0022] Example 1

[0023] 1. Preparation of 20wt.% Ni / SiO by dipping method 2 Catalyst: Dissolve 0.805g nickel chloride hexahydrate in 4ml deionized water, add 2ml absolute ethanol and stir evenly, then add 0.806g silica carrier, stir and volatilize to dryness at room temperature; place the sample in hydrogen at 450℃ Reduction treatment for 2h to obtain 20wt.% Ni / SiO 2 -H 2 Nano catalyst

[0024] 2. Impregnate 20wt.% Ni / SiO with a boric acid aqueous solution with a concentration of 0.374mol / L 2 -H 2 The catalyst, in which the atomic ratio of B / Ni is 3:1, stir and evaporate to dryness, and dry at 60℃ for 12h; 3 Nitriding treatment at 850°C for 1h in an atmosphere to obtain 20wt.% Ni 1 @(BN) 3 / SiO 2 Core-shell structure nano-catalytic material.

[0025] High resolution electron microscope (see figure 1 ) Indicates SiO 2 The surface of the supported Ni nanoparticles is coated with boron nitride to form a core-shell structure. X-ray diffraction characterization shows that boric acid ca...

Example Embodiment

[0026] Example 2

[0027] 1. Dissolve 0.248g nickel nitrate hexahydrate in 4ml deionized water, add 2ml absolute ethanol and stir evenly, then add 0.95g silica carrier, stir and volatilize to dryness at room temperature; further put the sample in hydrogen at 650℃ Reduction treatment for 2h to obtain 5wt.% Ni / SiO 2 -H 2 Nano catalyst

[0028] 2. Impregnating 5wt.% Ni / SiO with a 0.374mol / L diboron trioxide aqueous solution 2 -H 2 The catalyst, in which the atomic ratio of B / Ni is 1:10, stir and evaporate to dryness, and dry at 60°C for 12 hours; 2 Nitriding treatment at 750°C for 1h in an atmosphere to obtain 5wt.% Ni 10 @(BN) 1 / SiO 2 Core-shell structure nano-catalytic material.

Example Embodiment

[0029] Example 3

[0030] 1. Dissolve 0.805g of nickel chloride hexahydrate in 4ml of deionized water, add 2ml of absolute ethanol and stir evenly, then add 0.806g of silica carrier, stir and evaporate to dryness at room temperature, and further put the sample in hydrogen for 500 Reduction treatment at ℃ for 2h to obtain 20wt.% Ni / SiO 2 -H 2 Nano catalyst

[0031] 2. Impregnate 20wt.% Ni / SiO with a boric acid aqueous solution with a concentration of 0.374mol / L 2 -H 2 The catalyst, in which the atomic ratio of B / Ni is 1:1, is stirred and volatilized to dryness, and dried at 60°C for 12 hours. 3 Nitriding treatment at 850°C for 1h in an atmosphere to obtain 20wt.% Ni 1 @(BN) 1 / SiO 2 Core-shell structure nano-catalytic material.

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Abstract

The invention discloses a metal@BN core-shell structure nanometer catalyst for a synthesis gas methanation reaction, and a preparation method thereof. According to the present invention, the composition of the catalyst is 5-30wt.%Mx@(BN)y/SiO2, wherein metal M nanoparticles are loaded on a SiO2 support, the loading mass percentage is 5-30%, an ultrathin boron nitride (BN) layer is covered on the surface, the catalyst has a core-shell structure, and a molar ratio y/x of the BN to the metal nanoparticles is 0.1-10; with the application of the catalyst in the methane preparation reaction through the hydrogenation of the catalytic synthesis gas, the sintering and the loss of the metal nanoparticles can be prevented, and the catalyst deactivation caused by the carbon deposition on the catalyst active site surface can be prevented with the core-shell structure; and the catalyst has high low-temperature activity and high high-temperature stability.

Description

technical field [0001] The invention relates to a metal@BN core-shell structure nano-catalyst used for synthesis gas methanation reaction and a preparation method thereof. Background technique [0002] With the increasingly tense world energy supply and people's urgent demand for clean energy, coal-to-natural gas technology has attracted widespread attention. Synthetic natural gas can not only enrich the composition of energy, but also reduce the import of natural gas. Combined with the specific national conditions of our country, which is relatively "rich in coal and low in oil", it is possible to pressure-gasify and methanize scattered coal and transport it through pipelines for centralized supply, thereby improving people's quality of life and improving the ecological environment. [0003] For the methanation reaction of syngas, noble metal catalysts have quite high catalytic activity at low temperature. However, due to the limited natural reserves of precious metals in...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C07C9/04C07C1/04
Inventor 傅强高丽君包信和
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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