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Supported copper-based metal catalyst with high dispersion as well as preparation method and application thereof

A supported catalyst technology, applied in the preparation of hydroxyl compounds, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of large metal oxide particle size, easy collapse of laminates, and poor dispersion and other problems, to achieve the effect of preventing sintering aggregation, improving dispersion and good stability

Inactive Publication Date: 2013-04-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after hydrotalcite is roasted at high temperature, the laminates are easy to collapse and sinter and aggregate, and the obtained metal oxide particles have large size and poor dispersion.

Method used

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  • Supported copper-based metal catalyst with high dispersion as well as preparation method and application thereof
  • Supported copper-based metal catalyst with high dispersion as well as preparation method and application thereof
  • Supported copper-based metal catalyst with high dispersion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 0.6444g of Cu(NO 3 ) 2 ·6H 2 O and 1.5866g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 4ml deionized water to prepare Cu(NO 3 ) 2 and Zn(NO 3 ) 2 The mixed salt solution, and the mol ratio of copper nitrate and zinc nitrate is 0.5: 1; Then add 0.9614g urea to it again. Weigh 2g spherical γ-Al 2 o 3 The carrier was added to the above-prepared solution, soaked for 1 hour, transferred to a 25mL polytetrafluoroethylene liner and placed in a high-pressure reactor, and reacted at 100°C for 10 hours. Secondary to neutral, dry in an oven at 70°C for 12 hours to obtain in-situ supported copper-based hydrotalcite CuZnAl-LDHs / γ-Al 2 o 3 . The resulting CuZnAl-LDHs / γ-Al 2 o 3 Placed in a muffle furnace for calcination, raised to 500°C at a heating rate of 5°C / min and held for 6 hours, and cooled naturally to room temperature to obtain the corresponding in-situ supported composite metal oxide. Then put the obtained in-situ supported composite metal oxide in a tubul...

Embodiment 2

[0028] Weigh 0.9664g of Cu(NO 3 ) 2 ·6H 2 O and 1.0256g of Mg(NO 3 ) 2 ·6H 2 O was dissolved in 4ml deionized water to prepare Cu(NO 3 ) 2 and Mg(NO 3 ) 2 The mixed salt solution, and the mol ratio of copper nitrate and magnesium nitrate is 1: 1; Then add 1.4422g urea to it again. Weigh 2g spherical γ-Al 2 o 3 The carrier was added to the above-prepared solution, soaked for 2 hours, transferred to a 25mL polytetrafluoroethylene liner and placed in a high-pressure reactor, and reacted at 120°C for 14 hours. After the reaction was completed, it was naturally cooled to room temperature. Secondary to neutral, dried in an oven at 60°C for 16 hours to obtain in-situ supported copper-based hydrotalcite CuMgAl-LDHs / γ-Al 2 o 3 . The obtained CuMgAl-LDHs / γ-Al 2 o 3 Placed in a muffle furnace for calcination, raised to 600°C at a rate of 10°C / min and held for 7 hours, and cooled naturally to room temperature to obtain the corresponding in-situ supported composite metal oxi...

Embodiment 3

[0031] Weigh 0.4832g of Cu(NO 3 ) 2 ·6H 2 O and 1.7462g of Co(NO 3 ) 2 ·6H 2 O was dissolved in 4ml deionized water to prepare Cu(NO 3 ) 2 and Co(NO 3 ) 2 The mixed salt solution, and the mol ratio of copper nitrate and zinc nitrate is 0.3: 1; Then add 1.6825g urea to it again. Weigh 2g spherical γ-Al 2 o 3 The carrier was added to the above-prepared solution, soaked for 4 hours, transferred to a 25mL polytetrafluoroethylene liner and placed in a high-pressure reactor, and reacted at 110°C for 24 hours. After the reaction was completed, it was naturally cooled to room temperature. Secondary to neutral, dried in an oven at 30°C for 10 hours to obtain in-situ supported copper-based hydrotalcite CuCoAl-LDHs / γ-Al 2 o 3 . The resulting CuCoAl-LDHs / γ-Al 2 o 3 Placed in a muffle furnace for calcination, raised to 700°C at a heating rate of 5°C / min and held for 5 hours, and cooled naturally to room temperature to obtain the corresponding in-situ supported composite meta...

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Abstract

The invention provides a supported copper-based metal catalyst with high dispersion as well as a preparation method and application thereof. The catalyst is obtained by loading Cu (Copper) nanoparticles and MO (Molybdenum) on a surface of gamma-Al2O3 (Aluminum Oxide), and a chemical formula of the catalyst is Cu / MO / gamma-Al2O3. The preparation method of the supported copper-based metal catalyst comprises the following steps of: placing a gamma-Al2O3 carrier into a mixed salt solution containing divalent metal ions of copper ions, crystallizing the mixed solution to obtain a supported copper-based lamellar bimetal hydroxide precursor at 100 to 140 DEG C, and then roasting, decomposing and reducing the supported copper-based lamellar bimetal hydroxide precursor to obtain the supported copper-based metal catalyst. The Cu content in the catalyst is 0.5% to 10% by mass. The catalyst is mainly used for the selective catalytic hydrogenation of cinnamyl aldehyde; and furthermore, when the Cu content in the catalyst is 3% to 6% by mass, the percent conversion and the selectivity can reach up to 92% to 99% and 88% to 97%, respectively. In addition, the supported copper-based metal catalyst with high dispersion has the characteristics of high efficiency, cheapness and easiness in separation and recycling as well.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a highly dispersed and supported copper-based metal catalyst and the use of the catalyst in a selective catalytic hydrogenation reaction process of cinnamaldehyde. technical background [0002] Cinnamyl alcohol is a typical α, β-unsaturated alcohol, which is one of the important intermediates in the synthesis of fine chemicals, and is widely used in the preparation of flavors and fragrances and in the field of pharmaceutical synthesis. At present, cinnamyl alcohol is mostly prepared by selective hydrogenation of cinnamaldehyde, because the bond energy of the C=O bond (715kJ / mol) is greater than the bond energy of the C=C bond (615kJ / mol), and there is also a conjugated C=C bond and C=O bond, it is not easy to selectively hydrogenate the C=O bond while retaining the C=C double bond. Studies have shown that in order to improve the s...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J23/72B01J23/75B01J23/755C07C33/32C07C29/141
Inventor 李峰李木子张绍岩刘全遥范国利
Owner BEIJING UNIV OF CHEM TECH
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