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Highly dispersed palladium/cobalt hydroxide catalyst and its preparation method and application

A catalyst and highly dispersed technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems affecting the service life of the catalyst, poor ethylene selectivity, etc. Achieve high stability, high ethylene selectivity, and high catalytic activity

Active Publication Date: 2022-04-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the palladium-based catalysts traditionally used in industry have better catalytic activity, they have poor ethylene selectivity, which will cause excessive hydrogenation to generate ethane or oligomerization to generate green oil, which will affect the performance of the catalyst. service life

Method used

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  • Highly dispersed palladium/cobalt hydroxide catalyst and its preparation method and application
  • Highly dispersed palladium/cobalt hydroxide catalyst and its preparation method and application
  • Highly dispersed palladium/cobalt hydroxide catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0031] Weigh a certain amount of palladium acetate and dissolve it in concentrated hydrochloric acid, transfer it to a volumetric flask, add a certain amount of deionized water to the corresponding scale, and prepare a chloropalladium acid solution with a mass concentration of palladium of 0.001 g / mL. According to the loading capacity and its proportion listed in Table 2, mix the metered chloropalladium acid solution and a certain amount of deionized water, after stirring evenly, uniformly mix the highly dispersed Co(OH) 2 Carrier (the specific surface area is about 150-250m 2 / g) Pour into the impregnating solution, and ultrasonically disperse it evenly. Wetting the Co(OH) 2 The carrier is soaked at room temperature for 12 hours, and dried at 110°C for 12 hours. After taking out the sample, the sample is calcined at 350-700°C for 6 hours to obtain highly dispersed Pd / Co(OH) 2 catalyst.

Embodiment 4

[0032] Co(OH) in Example 4 2 The comparison of the texture properties of the carrier before and after loading Pd is shown in Table 1:

[0033] Table 1 Comparison of texture properties of supports before and after loading Pd

[0034]

Embodiment 6

[0036] With reference to the operation of embodiment 5, the only difference is that the carrier is replaced by a specific surface area of ​​60m 2 / g of alumina to make simple Pd / Al 2 o 3 catalyst.

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Abstract

The invention provides a highly dispersed Pd / Co(OH) 2 Catalyst and its preparation method and application, the present invention has firstly prepared Co(OH) with higher specific surface area by simple method 2 The carrier, and then through calcination and other operations to make the surface of the carrier have more defect sites, and then the palladium impregnating solution is loaded on the Co(OH) 2 On the carrier, a highly dispersed Pd / Co(OH) with better performance was prepared 2 Catalyst; Highly dispersed Pd / Co(OH) of the present invention 2 The preparation of the catalyst is applied in the selective hydrogenation of acetylene, which not only has high catalytic activity and high ethylene selectivity, but also has the advantages of excellent stability and high atom utilization.

Description

(1) Technical field [0001] The invention relates to a highly dispersed Pd / Co(OH) 2 Catalyst and its preparation method, and its application in the selective hydrogenation of acetylene. (2) Background technology [0002] Ethylene is one of the most important chemical products in the world and is widely used in various fields such as synthetic plastics, rubber, fibers, medicine, pesticides and dyes. Industrial ethylene is mainly produced through the cracking of raw materials such as naphtha and diesel, but in the process of preparing ethylene gas, about 0.3%-3% of acetylene is often generated; these traces of acetylene will poison the Ziegler-Natta of the downstream polyethylene process The catalyst will not only reduce the activity and service life of the catalyst, but also seriously affect the product quality of the polyethylene process. Therefore, the removal of trace acetylene in raw gas has important industrial significance. [0003] The method commonly used in industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C07C5/09C07C11/04B01J37/08B01J37/02
CPCB01J23/8906C07C5/09B01J37/0213B01J37/0205B01J37/088C07C2523/89C07C11/04Y02P20/52
Inventor 张群峰黄伟民周静马磊卢春山丰枫李小年
Owner ZHEJIANG UNIV OF TECH
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