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Ni-Zn-Co metal composite catalyst and preparation method thereof

A metal composite and catalyst technology, applied in the direction of carbon compound catalysts, metal/metal oxide/metal hydroxide catalysts, catalysts, etc., to achieve the effects of good dispersion, high acetylene conversion rate, and high ethylene selectivity

Active Publication Date: 2017-11-10
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no literature report on the synthesis of catalytic materials related to the gas phase reaction under the gas phase atmosphere required by the reaction system

Method used

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  • Ni-Zn-Co metal composite catalyst and preparation method thereof
  • Ni-Zn-Co metal composite catalyst and preparation method thereof

Examples

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preparation example Construction

[0029] On the other hand, the present invention provides the preparation method of above-mentioned catalyst, comprises the following steps:

[0030] Step 1: Weigh nickel acetylacetonate, zinc acetylacetonate and cobalt acetylacetonate, add them into oleylamine, and stir until all acetylacetonate salts are dissolved to obtain a mixed solution;

[0031] Step 2: placing the mixed solution in a mixed atmosphere of hydrogen and acetylene, stirring, reacting at a certain temperature, cooling, and centrifuging to obtain a calcined precursor;

[0032] Step 3: calcining the calcined precursor obtained in step 2 in an air atmosphere to obtain a composite oxide;

[0033] Step 4: reducing the composite oxide with hydrogen to obtain the Ni-Zn-Co metal composite catalyst.

[0034] The specific steps are:

[0035] Step 1: Weigh a certain mass of nickel acetylacetonate, zinc acetylacetonate and cobalt acetylacetonate in proportion, add them into a dynamic reaction kettle equipped with oleyl...

Embodiment 1

[0050] The preparation method of catalyst comprises the following steps:

[0051] Step 1: Add 100g of oleylamine solvent into the dynamic reaction kettle, then add 1g of nickel acetylacetonate, 3g of zinc acetylacetonate and 0.5g of cobalt acetylacetonate into the solution in sequence, and keep stirring until the acetylacetonate is completely dissolved in oleylamine That's it.

[0052] Step 2: After sealing the dynamic kettle, feed the mixed gas of hydrogen and acetylene, and the volume ratio of hydrogen and acetylene is 4:1, inflate and exhaust at least 5 times, then close the outlet of the dynamic kettle; Mixed gas of hydrogen and acetylene, pressurized to 0.01MPa, close the mixed gas. Adjust the rotational speed of the dynamic reaction kettle to 500r / min, and the temperature to 100°C, and naturally cool to room temperature after reacting for 10 hours.

[0053] Step 3: After exhausting the dynamic reactor, stop stirring. Centrifuge the mixture in the kettle, and alternate...

Embodiment 2- Embodiment 8

[0057] The present invention has passed multiple sets of experimental verifications in the laboratory. The catalyst preparation process in the verification process and the steps of preparing ethylene by hydrogenation of acetylene are all the same as the method steps introduced in Example 1. The difference lies in the proportioning of the catalyst components. And the control parameters of the preparation process and the acetylene hydrogenation reaction conditions are different, and the specific differences are shown in the table below.

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Abstract

The invention provides an Ni-Zn-Co metal composite catalyst. The mass ratio of Ni to Zn to Co is (0.228-0.685) to (0.744-1.241) to (0.083-0.248). The invention further provides a preparation method of the Ni-Zn-Co metal composite catalyst. A novel catalyst synthesis method is adopted, and under the condition that synthesis atmosphere and reaction atmosphere are consistent, through optimization combination, solution reaction and calcination in air, the Ni-Zn-Co metal composite catalyst with good dispersibility and a uniform shape is finally prepared after hydrogen reduction in a fixed-bed reactor; the catalyst is used in acetylene selective hydrogenation to obtain a combined composition with a high acetylene conversion rate and high ethylene selectivity, the reaction conditions are mild, and operational and industrial amplification is facilitated.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a Ni-Zn-Co metal composite catalyst and a preparation method thereof. Background technique [0002] In the selective catalytic hydrogenation of acetylene to ethylene, palladium-based catalysts supported by alumina are usually used, and alkali metals or alkaline earth metals are added to improve the conversion of acetylene and the selectivity of ethylene. Especially in supported Pd-Ag / Al 2 o 3 In the catalyst, the addition of Ag can effectively improve the selectivity of acetylene selective hydrogenation to ethylene. Using noble metal Pd as an effective active component, the catalyst is not only expensive, but also easily deactivated by the poisoning of impurity gases such as sulfide, phosphide and arsenide contained in acetylene gas. The supported catalyst of Ni-Zn system is most likely to replace the noble metal Pd-Ag system because of its low price and strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C07C5/05C07C11/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C07C5/05B01J23/80C07C2523/80B01J35/613C07C11/04Y02P20/52
Inventor 史东军史雪君余海鹏黄伟吴黎阳苏二强吴道洪
Owner BEIJING HUAFU ENG
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