Preparation method of organic-inorganic hybrid material coated nickel silicate nanotube catalyst

A hybrid material, nickel silicate technology, applied in the direction of physical/chemical process catalysts, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of reducing active centers, reducing reactivity, affecting molecular diffusion of reactants and products, etc. Achieve the effects of inhibiting nucleation, improving anti-carbon performance, good stability and anti-carbon performance

Pending Publication Date: 2022-02-18
TIANJIN UNIV
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Problems solved by technology

The sintering of the active components of the nickel-based catalyst reduces the active center of the catalyst and reduces the reaction activity; in addition, the carbon deposits generated by the catalyst during the reaction not only cover the active site of the catalyst, but also block its pores, affecting the reaction of reactants and product molecules. Diffusion

Method used

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  • Preparation method of organic-inorganic hybrid material coated nickel silicate nanotube catalyst
  • Preparation method of organic-inorganic hybrid material coated nickel silicate nanotube catalyst

Examples

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Effect test

Embodiment 1

[0035] Preparation of nickel silicate nanotubes 40 milliliters of 0.5mol / L sodium silicate solution was poured into 150 milliliters of 0.7mol / L NiCl under stirring conditions 2 ·6H 2 O aqueous solution, after 10 minutes, 29g NaOH was added to the above mixed solution at one time, stirred for 10 minutes, put into a crystallization kettle for crystallization at 210°C for 24 hours. The obtained precipitate was washed three times with water and washed with alcohol three times, and then dried overnight at 60° C. to obtain a nickel silicate nanotube precursor.

[0036] Organic-inorganic hybrid material-coated nickel silicate nanotube catalyst was prepared by direct synthesis and functionalization: 0.1g nickel silicate nanotube and 0.4g hexadecyltrimethylammonium bromide were dispersed in 30ml deionized water and 90ml anhydrous In the mixed solution of ethanol, sonicate for 2h. Then, under stirring, 3 ml of ammonia water was introduced. Mix 112.5 μL 3-aminopropyltriethoxysilane (A...

Embodiment 2

[0040] Preparation of nickel silicate nanotubes: 40 milliliters of 0.5mol / L sodium silicate solution was poured into 150 milliliters of 0.7mol / L NiCl under stirring conditions 2 ·6H 2 O aqueous solution, after 10 minutes, 29g NaOH was quickly added to the above mixed solution, stirred for 10 minutes, and placed in a crystallization kettle for crystallization at 210°C for 24 hours. The obtained precipitate was washed three times with water and washed with alcohol three times, and then dried overnight at 60° C. to obtain a nickel silicate nanotube precursor.

[0041] Post-synthesis functionalization Synthesis of organic-inorganic hybrid material coated nickel silicate nanotube catalyst, 0.1g nickel silicate nanotube and 0.4g hexadecyltrimethylammonium bromide dispersed in 30ml deionized water and 90ml absolute ethanol In the mixed solution, ultrasonic 2h. Then, under stirring, 3 ml of ammonia water was introduced. Mix 112.5 μL tetraethyl orthosilicate in 25 ml absolute ethano...

Embodiment 3

[0044] The other steps were the same as in Example 1, changing the addition amount of APTES to 75 μL and the addition amount of TEOS to 225 μL, the methane conversion rate dropped to 72% after 60h activity evaluation, resulting in 1.51% carbon deposition.

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Abstract

The invention relates to a preparation method of an organic-inorganic hybrid material coated nickel silicate nanotube catalyst. According to the method, a modified Stober method is used, and a nickel silicate nanotube coated with an amino-functionalized organic-inorganic hybrid material is realized at normal temperature in one step, namely, an inorganic silicon source tetraethoxysilane (TEOS) is added, and meanwhile, an amino-carrying organic silicon source 3-aminopropyltriethoxysilane (APTES) is added; nickel nanoparticles with small sizes are obtained and are limited in a coating structure, and amino modification has a coordination effect, so that the catalyst sintering resistance is improved. The obtained organic-inorganic hybrid material coated nickel silicate nanotube catalyst has excellent catalytic performance, the sintering resistance and the carbon deposition resistance of the catalyst are improved, and a coupling enhancement effect is generated.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and environmental protection, and in particular relates to a preparation method of an organic-inorganic hybrid material-coated nickel silicate nanotube catalyst. Background technique [0002] In recent years, with the advancement and development of science and technology, the demand for fossil fuels has been increasing. Due to the burning of a large amount of fossil fuels, the content of carbon dioxide in the atmosphere has increased year by year, which has led to the intensification of the greenhouse effect. But besides being a greenhouse gas, carbon dioxide itself is also a valuable resource, so more and more scientists hope to seek a breakthrough in the utilization of carbon dioxide. At the same time, with the over-exploitation of oil resources, its reserves are becoming increasingly scarce. Natural gas, which is one of the three major fossil energy sources but has not been fully e...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/40C01B32/40
CPCB01J27/24C01B3/40C01B32/40Y02P20/52
Inventor 马新宾王胜平吕静李茂帅郭丹
Owner TIANJIN UNIV
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