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Hydrotalcite-like compound-based magnesium-zirconium-aluminum composite oxide catalyst and use thereof

A composite oxide and catalyst technology, applied in physical/chemical process catalysts, hydroxyl compound preparation, chemical/physical processes, etc., can solve the problems of increasing catalyst energy consumption, uneven grain dispersion, catalyst activity limitation, etc. The effect of mild conditions, uniform distribution and improved activity

Inactive Publication Date: 2010-06-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is reduced with hydrogen before use, and the activity of the catalyst is limited at low temperatures, so the possible yield is also limited, while at high temperatures the activity of the catalyst will increase, but it will also dehydrate the generated α-phenylethanol into benzene ethylene, thus reducing the selectivity of the reaction
②.CN 1557545A (04.12.29) describes an amorphous alloy catalyst containing nickel and boron, but the preparation of the catalyst is relatively complicated and the reaction pressure is relatively high
However, it will be roasted twice during the preparation process, which will increase the energy consumption of catalyst preparation, and the loading of ZrO 2 ZrO sometimes occurs during 2 Inhomogeneous grain dispersion

Method used

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  • Hydrotalcite-like compound-based magnesium-zirconium-aluminum composite oxide catalyst and use thereof
  • Hydrotalcite-like compound-based magnesium-zirconium-aluminum composite oxide catalyst and use thereof
  • Hydrotalcite-like compound-based magnesium-zirconium-aluminum composite oxide catalyst and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Preparation of hydrotalcite-like magnesium-zirconium-aluminum composite oxide (Mg / Zr / Al-LDO) catalyst

[0026] The preparation of the precursor magnesium-zirconium-aluminum hydrotalcite (Mg / Zr / Al-LDH): by co-precipitation method, adding 38.46g Mg(NO 3 ) 2 ·6H 2 O, 1.94g Zr(NO 3 ) 4 ·5H 2 O and 28.13gAl(NO 3 ) 3 9H 2 O to 100g of deionized water, fully stirred to dissolve. Add 250 mL of Na to a 500 mL three-neck flask 2 CO 3 solution, the magnesium-zirconium-aluminum mixed solution was added dropwise thereto, and at the same time, the pH value was adjusted to 10.0 with NaOH solution. After the dropwise addition, put the white turbid liquid into a crystallization kettle for crystallization for 18 hours, then wash and filter, and dry the white solid at 100°C to obtain magnesium-zirconium-aluminum hydrotalcite Mg 2 / Zr 0.06 / Al 1 -LDH.

[0027] The above-mentioned magnesium-zirconium-aluminum hydrotalcite (Mg 2 / Zr 0.06 / Al 1 -LDH) was calcine...

Embodiment 2

[0028] Embodiment 2: the preparation of the Mg / Zr / Al-LDO catalyst of different calcining temperature

[0029] According to the method of Example 1, the catalyst precursor magnesium-zirconium-aluminum hydrotalcite Mg / Zr / Al-LDH was obtained, and different calcination temperatures (250°C, 300°C, 400°C, 700°C) were obtained by changing the calcination temperature of the catalyst precursor. , 900°C) Mg / Zr / Al-LDO catalyst, the calcination time is 8h. Gained catalyst is recorded as: Mg 2 / Zr 0.06 / Al 1 -LDO-300, Mg 2 / Zr 0.06 / Al 1 -LDO-400, Mg 2 / Zr 0.06 / Al 1 -LDO-700, Mg 2 / Zr 0.06 / Al 1 -LDO-900.

Embodiment 3

[0030] Embodiment 3: supported zirconium oxide (ZrO 2 - Preparation of Mg / Al-LDO) catalyst

[0031] The preparation of carrier magnesium-aluminum composite oxide (Mg / Al-LDO): by co-precipitation method, adding 38.46g Mg(NO 3 ) 2 ·6H 2 O and 28.13g Al(NO 3 ) 3 9H 2 O to 100g of deionized water, fully stirred to dissolve. Add 250 mL of Na to a 500 mL three-neck flask 2 CO 3 solution, the magnesium-aluminum mixed solution was added dropwise therein, and at the same time, the pH value was adjusted to 10.0 with NaOH solution. After the dropwise addition, the white turbid liquid was put into a crystallization tank for crystallization for 12 hours, washed and filtered, and the white solid was dried at 100°C to obtain magnesium aluminum hydrotalcite (Mg 2 / Al 1 -LDH). The magnesium aluminum hydrotalcite (Mg 2 / Al 1 -LDH), the magnesium-aluminum composite metal oxide (Mg 2 / Al 1 -LDO).

[0032] Then add 1.47g Zr(NO 3 ) 4 ·5H 2 O was dissolved in 100 g of deionized wa...

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Abstract

The invention discloses a hydrotalcite-like compound-based magnesium-zirconium-aluminum composite oxide catalyst and use thereof. The catalyst is prepared by roasting magnesium-zirconium-aluminum hydrotalcite (Mg / Zr / Al-LDH). The composition of the magnesium-zirconium-aluminum composite oxide catalyst (Mg / Zr / Al-LDO) is represented by (MgO)x(Zro2)y(Al2O3)0.5, wherein x is between 0 and 20 and y is between 0 and 1. The catalyst can be used in the reaction for preparing corresponding alcohol compounds by reducing ketones (particularly cyclohexanone or acetophenone) by hydrogenation and has the advantages of mild reaction conditions, low reaction energy consumption, high catalytic activity and selectivity, simple post-reaction processing, simple preparation process and low cost.

Description

(1) Technical field [0001] The invention relates to a hydrotalcite-like magnesium-zirconium-aluminum composite oxide Mg / Zr / Al-LDO catalyst and its application, mainly for the preparation of corresponding alcohol compounds (such as cyclohexanol, α-phenylethyl alcohol, etc.) in the hydrogenation reduction of ketones in the application. (2) Background technology [0002] Alcohol compounds such as cyclohexanol, 2-octanol, α-phenylethyl alcohol, α, β-unsaturated alcohol, etc. are important chemical raw materials, widely used in detergents, surfactants, synthetic fragrances, pharmaceuticals and fine chemical intermediates body etc. One of the effective ways to synthesize the above-mentioned alcohols is by hydrogenation reduction of corresponding ketones; but ketones are a relatively stable compound, and under normal circumstances, it is difficult to generate alcohols by hydrogenation, and its activation energy must be reduced in the presence of a catalyst. to react. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/10C07C29/143C07C35/08C07C33/22
Inventor 石能富张波徐春雷卢晗峰葛忠华
Owner ZHEJIANG UNIV OF TECH
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