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Eggshell type Pd catalyst prepared by reaction deposition method

A catalyst and eggshell-type technology, which is applied in the field of preparation of eggshell-type Pd catalysts by reaction deposition, can solve the problems of high solvent cost, harsh carrier requirements, and unfavorable industrialization, and achieve few influencing factors, excellent performance, and easy industrialization Effect

Active Publication Date: 2012-05-23
成都大研科技产业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is that it is harsh on the carrier and is limited to hydrophobic silica
Its disadvantage is that the steps are cumbersome, the solvent cost is high, and it is not conducive to industrialization

Method used

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  • Eggshell type Pd catalyst prepared by reaction deposition method
  • Eggshell type Pd catalyst prepared by reaction deposition method
  • Eggshell type Pd catalyst prepared by reaction deposition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 0.0186gPdCl 2 , Measure the ethanol solution (25mL ethanol + 1mL deionized water), put it into a 50mL round bottom reaction bottle, and then add 2.0g of SiO2 calcined in air at 500°C 2 -Al 2 o 3 Carrier, feed CO to react, the flow rate is 26mL / min, and vigorously stir at room temperature. After two hours of reaction, adjust the CO flow rate below 5 mL / min and keep the reaction under CO atmosphere for 3 days. After the reaction is completed, the carrier is filtered out, washed with ethanol for more than 3 times, and dried in an Ar atmosphere to obtain eggshell-type Pd / SiO 2 -Al 2 o 3 catalyst. ICP results show that the mass percentage of metal Pd is 0.20%. The EPMA characterization result of gained eggshell type Pd catalyst is as follows figure 1 shown.

Embodiment 2

[0022] Weigh 0.0505gPdCl 2 , Measure the ethanol solution (25mL ethanol + 1mL deionized water), put it into a 50mL round bottom reaction bottle, and then add 2.0g of SiO2 calcined in air at 500°C 2 -Al 2 o 3 Carrier, feed CO to react, the flow rate is 26mL / min, and vigorously stir at room temperature. After two hours of reaction, adjust the CO flow rate below 5 mL / min and keep the reaction under CO atmosphere for 3 days. After the reaction is completed, the carrier is filtered out, washed with ethanol for more than 3 times, and dried in an Ar atmosphere to obtain eggshell-type Pd / SiO 2 -Al 2 o 3 catalyst. ICP results showed that the mass percentage of metal Pd was 0.23%. The EPMA characterization results of eggshell-type Pd catalysts are as follows: figure 2 .

Embodiment 3

[0024] Weigh 0.1302gPdCl 2 , Measure the ethanol solution (25mL ethanol + 1mL deionized water), put it into a 50mL round bottom reaction bottle, and then add 2.0g of SiO2 calcined in air at 500°C 2 -Al 2 o 3 Carrier, feed CO to react, the flow rate is 26mL / min, and vigorously stir at room temperature. After two hours of reaction, adjust the CO flow rate below 5 mL / min and keep the reaction under CO atmosphere for 3 days. After the reaction is completed, the carrier is filtered out, washed with ethanol for more than 3 times, and dried in an Ar atmosphere to obtain eggshell-type Pd / SiO 2 -Al 2 o 3 catalyst. ICP results showed that the mass percentage of metal Pd was 0.39%. The transmission electron micrograph of the Pd particle on the gained eggshell catalyst is as follows: image 3 shown.

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Abstract

The invention discloses an eggshell type Pd catalyst prepared by a reaction deposition method, which belongs to the technical field of industrial catalysts. The method comprises the following steps: adding a carrier into Pd metal salt solution; controlling the deposition of Pd on the surface of the carrier by a rapid reduction reaction; and carrying out filtering, washing as well as heating and drying in inert atmosphere to form a stable eggshell type Pd catalyst. The eggshell type Pd catalyst has the advantages of simple process, controllable structure, low energy consumption process and thelike; Pd particles in the prepared eggshell type Pd catalyst are evenly distributed on the surface of the carrier, thus the eggshell type Pd catalyst reduces the consumption of noble metal Pd, effectively reduces the cost of the catalyst and has favorable industrial application prospect. The eggshell type Pd catalyst can be used for enyne hydrocarbon selective hydrogenation, cracking ethylene C9 fraction selective hydrogenation, olefin aldehyde selective hydrogenation, anthraquinone catalytic hydrogenation in H2O2 synthesis and other reactions.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis, and relates to a reaction deposition method for preparing eggshell-type Pd catalysts. Background technique [0002] Supported noble metal catalysts are widely used in petrochemical and fine chemical industries. The use of the carrier can increase the dispersion of the noble metal, improve the utilization rate of the noble metal and reduce the cost of the noble metal catalyst. In recent years, a great deal of research has involved the particle size and distribution control of noble metals on supports. The choice of the optimal distribution of metals in the carrier is mainly determined by the activity, selectivity and other reaction parameters (such as reaction kinetics, mass transfer) required by the catalytic reaction. The distribution of typical active ingredients on the carrier can be divided into eggshell type, egg white type, egg yolk type and homogeneous type. Among them, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J35/02B01J37/16C07C15/46C07C5/09C10G45/40C07C45/62C01B15/023B01J35/00
Inventor 梁长海邵正锋李闯陈霄
Owner 成都大研科技产业发展有限公司