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Catalyst and its preparation method and application

A technology of catalyst and hydrogenation reaction, applied in the direction of catalyst activation/preparation, catalyst, carbon compound catalyst, etc., can solve the problem of low ethylene selectivity and achieve high acetylene conversion rate and ethylene selectivity effect

Active Publication Date: 2020-09-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other metal catalysts (Cu, Ni), the supported Pd catalyst has better catalytic performance for acetylene hydrogenation, but the selectivity to ethylene is still not high under the condition of higher acetylene conversion or higher hydrogen partial pressure.

Method used

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  • Catalyst and its preparation method and application
  • Catalyst and its preparation method and application
  • Catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 Shown, a kind of preparation method of catalyst comprises:

[0030] Step S1: providing soluble palladium salt and Cu-BTC, the dosage ratio of the soluble palladium salt and Cu-BTC is (0.01-0.1) mmol: 1g;

[0031] Step S2: fully dissolving the soluble palladium salt in ammonia water to obtain an ammonia solution of palladium, adding water to the ammonia solution of palladium to adjust the pH to 7-8 to obtain a reaction solution;

[0032] Step S3: fully mixing the reaction solution and Cu-BTC to obtain a mixture;

[0033] Step S4: drying and calcining the mixture to obtain the desired catalyst. The catalyst can be recorded as Pd-Cu / C catalyst.

[0034] In the preparation method of the catalyst, the soluble palladium salt referred to in step S1 may be palladium chloride, palladium nitrate and the like. Cu-BTC can be purchased directly or prepared by yourself. Preferably, the preparation method of the catalyst further includes the preparation of Cu-BTC...

Embodiment 2

[0068] A catalyst, prepared by the preparation method of the catalyst in Example 1. as mentioned above and Figure 6-8 It can be seen that the catalyst has a quasi-octahedral structure, and the distribution is uniform and the size is uniform and regular. In addition, the surface of the catalyst is covered with pores and small round particles. The BET specific surface area of ​​the catalyst is 100-150m2 / g. The average pore diameter of the catalyst is 10-25nm.

Embodiment 3

[0070] An application of the catalyst, the catalyst in the second embodiment is applied to remove acetylene from ethylene, and the hydrogenation reaction of the acetylene is catalyzed to remove it. It can be understood that the content of acetylene is less, and the purpose of this catalyst is, one, to remove acetylene as much as possible, that is, hope to obtain a higher conversion rate of acetylene; second, to obtain more ethylene, that is, to use unnecessary Acetylene is converted to ethylene, that is, a higher ethylene selectivity is expected.

[0071] Using this catalyst to remove acetylene from ethylene, the results are shown in the table below:

[0072] temperature(℃) Acetylene conversion rate (%) Ethylene selectivity (%) 75 45 96 100 70 92 125 86 84 150 90 80

[0073] The reaction condition is 2.91vol% H 2 ,0.97vol%C 2 h 2 and 96.11vol%C 2 h 4

[0074] It can be seen from the above table that the catalyst has better acety...

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Abstract

The invention relates to the technical field of chemical materials, and provides a catalyst as well as a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: providing soluble palladium salt and Cu-BTC in a dosage ratio of (0.01 to 0.1)mmol to 1g; fully dissolving the soluble palladium salt in ammonium hydroxide to obtain an ammonium solution of palladium, adding water into the ammonium solution to adjust the pH to 7 to 8 in order to obtain a reaction solution; fully mixing the reaction solution with the Cu-BTC to obtain a mixture; drying the mixture, and sintering to obtain a desired catalyst. The catalyst prepared with the preparation method of the catalyst is particularly suitable for removing acetylene from ethylene, and hasa higher ethylene conversion rate and ethylene selectivity at the same time. The invention also provides a catalyst prepared with the preparation method of the catalyst. The invention further providesapplication of the catalyst. The catalyst is applied to removal of the acetylene from the ethylene.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a catalyst and its preparation method and application. Background technique [0002] Ethylene is an important chemical raw material in the organic synthesis industry. Thousands of mid- and downstream products can be produced through different polymerization reactions, and its output is used to measure the development level of a country's basic petrochemical industry. Today, the main source of industrial ethylene is the thermal cracking of petroleum. The ethylene produced during petroleum pyrolysis often contains a small amount of acetylene, which seriously affects the catalytic performance of subsequent ethylene polymerization catalysts. The process of selective hydrogenation of acetylene to ethylene is economical and simple, so it has become the most commonly used method for removing acetylene in industry. The deacetylation effect is the key to evaluating catalysts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/10B01J37/08C07C7/167C07C11/04
CPCB01J23/8926B01J35/1019B01J35/1061B01J37/086C07C7/167C07C2523/89C07C11/04Y02P20/52
Inventor 闫晓亮卢晶军李瑞丰袁臣胡通范立明于峰范彬彬
Owner TAIYUAN UNIV OF TECH
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