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Carried nanometer bi-metal catalyst, and prepn. method and application thereof

A bimetallic catalyst and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, preparation of hydroxyl compounds, etc., can solve the problem of high cost, achieve low cost, high catalytic activity, and reaction short cycle effect

Inactive Publication Date: 2006-11-29
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this noble metal catalyst is relatively expensive

Method used

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  • Carried nanometer bi-metal catalyst, and prepn. method and application thereof
  • Carried nanometer bi-metal catalyst, and prepn. method and application thereof
  • Carried nanometer bi-metal catalyst, and prepn. method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Measure 12ml (11.12g) of ethyl orthosilicate, 20ml (16g) of absolute ethanol and 6ml (5.97g) of glacial acetic acid in a 250ml flask, heat and stir, and when the solution becomes clear, add 13.5g of Ni ( NO 3 ) 2 ·6H 2 O and 6.8gCr(NO 3 ) 3 9H 2 0, stirring to obtain an alcoholic aqueous solution of nickel nitrate and chromium nitrate; the heating temperature is 80° C., kept at a constant temperature for 0.5 hours under stirring, and a blue-green viscous and uniform sol is formed, and the stirring is stopped, and the sample is packed into a cylindrical mold with one end sealed. And block the other open end with a metal mesh, then put it into an autoclave, add 280ml of absolute ethanol in the kettle, heat up with a heating rate of 5°C / min after the kettle is sealed, and the pressure in the kettle is also constantly rising until the temperature and the pressure are above the critical value of ethanol, that is, it reaches the supercritical state. When the whole system...

Embodiment 2

[0031]Measure 12ml (11.12g) of ethyl orthosilicate, 5ml (3.95g) of absolute ethanol and 6ml (5.97g) of glacial acetic acid in a 250ml flask, heat and stir, when the solution becomes clear, add 13.5g of Ni (NO 3 ) 2 ·6H 2 O and 6.8gCr(NO 3 ) 3 9H 2 O, stir to obtain the alcoholic aqueous solution of nickel nitrate and chromium nitrate; keep the constant temperature for 0.5 hours at a heating temperature of 80° C. under stirring, produce a blue-green gel, stop stirring, pour it into a beaker and cool and age for 2 hours; put the gel Put it in the tubular mold as in Example 1, block the other open end with a metal mesh, then put it into an autoclave, add 300ml absolute ethanol in the still, all the other processes are the same as in Example 1, to obtain 40% Ni, 13% Cr NiO-Cr 2 o 3 -SiO 2 Supported nano-bimetallic catalyst; its specific surface area is 450.45m by BET method 2 / g.

[0032] attached image 3 It is NiO-Cr obtained in embodiment 2 2 o 3 -SiO 2 TEM images...

Embodiment 3

[0038] Measure 12ml (11.12g) of ethyl orthosilicate, 40ml (32g) of absolute ethanol and 6ml (5.97g) of glacial acetic acid in a 250ml flask, heat and stir, and when the solution becomes clear, add 13.5g of Ni ( NO 3 ) 2 ·6H 2 O and 6.8gCr(NO 3 ) 3 9H 2 0, stirring to obtain an alcoholic aqueous solution of nickel nitrate and chromium nitrate; the heating temperature was 80° C. and kept at a constant temperature for 0.5 hours under stirring to form a blue-green viscous and uniform sol, stop stirring, and directly pour the sample into the sample as in Example 1. In the tubular mould, block the other open end with a metal mesh, then put it into an autoclave, add 260ml of absolute ethanol in the still, and all the other processes are the same as in Example 1 to obtain NiO containing 40%Ni and 13%Cr. -Cr 2 o 3 -SiO 2 Supported nano-bimetallic catalyst, its specific surface area is 502.96m by BET method 2 / g.

[0039] In a 100ml autoclave, add 20ml solvent methanol and 10m...

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Abstract

A nano-bimetal carried catalyst NiO-Cr2O3-SiO2 for preparing alcohol by catalytic hydrogenating reaction of aldehyde or ketone is prepared from nickel nitrate and chromium nitrate through adding them to alcohol-acetic acid solution, heating, hydrolyzing to obtain sol, supercritical drying in high-pressure reactor by using alcohol as medium to obtain aerogel, calcining to obtain NiO-CrO3-SiO2, and reducing in H2 to obtain NiO-Cr2O3-SiO2.

Description

technical field [0001] The invention relates to a catalyst containing metal or metal oxide, in particular to a supported nano-nickel-chromium bimetallic catalyst and a preparation method and application thereof. Background technique [0002] As an important non-noble metal hydrogenation catalyst, nickel-based catalyst has the advantages of high catalytic activity, high selectivity and low cost, and has been paid attention by researchers. However, when nickel monometallic catalysts catalyze some hydrogenation reactions, they are easily poisoned and deactivated by some small molecules. For example, when the catalyst is used for the catalytic hydrogenation of the intermediate product 2,2-dimethylolbutyraldehyde in the synthesis of trimethylolpropane, it is particularly easy to absorb formaldehyde in the reaction solution and deactivate it. Therefore, a small amount of second metal can be added to the nickel-based catalyst to form a bimetallic catalyst, and its catalytic activi...

Claims

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Application Information

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IPC IPC(8): B01J23/86B01J21/08C07B41/02C07C31/22C07C29/136
Inventor 方莉刘滇生赵永祥马宏勋王永钊张因
Owner SHANXI UNIV
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