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Preparation method of palladium metal catalyst

A metal catalyst and microporous technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation process and low catalytic activity, so as to solve complex preparation process and improve catalytic activity. active effect

Pending Publication Date: 2020-06-02
陕西瑞科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation method of palladium metal catalyst, has solved the complicated preparation process in the existing palladium metal catalyst preparation method, the problem of low catalytic activity

Method used

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Examples

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Effect test

preparation example Construction

[0028] A kind of preparation method of palladium metal catalyst of the present invention comprises the following steps:

[0029] Step 1, prepare the alcoholic solution

[0030] Add ethyl cellulose powder to methanol solution, and conduct low-temperature ultrasonic treatment for 2-5 hours at a temperature of 10-20°C and an ultrasonic frequency of 50-100kHz to obtain an alcohol solution; the concentration of ethyl cellulose in the alcohol solution is 10-40g / ml; The purpose of low-temperature ultrasound is to avoid the volatilization of methanol.

[0031] Step 2, prepare the suspension

[0032] Add polyvinyl alcohol powder to the alcohol solution obtained in step 1 and stir at a speed of 1000-2000r / min to form a suspension; wherein the mass ratio of polyvinyl alcohol to ethyl cellulose in step 1 is 2-5 :1.

[0033] Step 3, mold shaping

[0034] Inject the suspension in step 2 into the shaping mold, heat it to 90-120°C to make it solidify better, pressurize it to 10-20MPa and...

Embodiment 1

[0040] Step 1: Add ethyl cellulose powder to methanol solution, and conduct low-temperature ultrasonic treatment for 2 hours at a temperature of 10° C. and an ultrasonic frequency of 100 kHz to obtain an alcohol solution; the concentration of ethyl cellulose in the alcohol solution is 10 g / ml.

[0041] Step 2, adding polyvinyl alcohol powder to the alcohol solution obtained in step 1 is 1000r / min stirring at a speed to form a suspension; wherein the mass ratio of the quality of polyvinyl alcohol to ethyl cellulose in step 1 is 2: 1.

[0042] Step 3: Inject the suspension in step 2 into a shaped mold, heat to 120°C, pressurize to 10MPa and keep for 5 hours, then release the pressure from the micropores to obtain a solid block, and put the solid block under the ultraviolet light intensity of 60mW / cm 2 1. Treat for 6 hours at a temperature of 80°C to obtain a microporous block;

[0043] Micropore pressure relief parameters: the micropore size is 20-200 microns, and the pressure ...

Embodiment 2

[0047] Step 1: Add ethyl cellulose powder to methanol solution, and conduct low-temperature ultrasonic treatment for 2.5 hours at a temperature of 12°C and an ultrasonic frequency of 90 kHz to obtain an alcohol solution; the concentration of ethyl cellulose in the alcohol solution is 20 g / ml.

[0048] Step 2, adding polyvinyl alcohol powder to the alcohol solution obtained in step 1 is 1200r / min stirring at a speed to form a suspension; wherein the mass ratio of the quality of polyvinyl alcohol to ethyl cellulose in step 1 is 2.6: 1.

[0049] Step 3: Inject the suspension in step 2 into a shaped mold, heat to 90°C, pressurize to 20MPa and keep for 2 hours, then release the pressure from the micropores to obtain a solid block, and then subject the solid block to an ultraviolet light intensity of 10mW / cm 2 1. Treat at 120°C for 3 hours to obtain a microporous block;

[0050] Micropore pressure relief parameters: the micropore size is 20-200 microns, and the pressure relief spee...

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Abstract

The invention discloses a preparation method of a palladium metal catalyst. The preparation method comprises the following steps: preparing an alcoholic solution; adding polyvinyl alcohol powder intothe alcoholic solution, and stirring to form turbid liquid; injecting the mixture into a shaping mold for molding, then, carrying out micropore pressure relief to obtain a solid block, and carrying out ultraviolet irradiation on the solid block to obtain a micropore block; adding palladium acetate into acetone, carrying out uniform mixing to obtain a dilute solution, then, uniformly coating the microporous block with the dilute solution, and carrying out drying; and carrying out high-temperature treatment on the coated microporous block to polymerize the polyvinyl alcohol, thereby obtaining the palladium solid catalyst. According to the preparation method disclosed by the invention, a thicker pore passage can be formed in the solid block through micropore pressure relief, so that reactionmaterials can enter and exit conveniently; under the irradiation of ultraviolet light, ethyl cellulose is decomposed to form richer and finer pore channels; and by using polyvinyl alcohol, polyvinyl alcohol can be converted into a conjugated double bond-containing polymer at a high temperature, and has conductivity, so that the catalytic activity of palladium metal is improved.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalysts, and in particular relates to a preparation method of a palladium metal catalyst. Background technique [0002] Precious metal catalyst (precious metal catalyst) is a kind of precious metal material that can change the speed of chemical reaction without participating in the final product of the reaction; because their d electron orbitals are not filled, the surface is easy to adsorb reactants, and the strength is moderate, which is conducive to the formation of The intermediate "active compound" has high catalytic activity, and also has comprehensive excellent properties such as high temperature resistance, oxidation resistance, and corrosion resistance, and has become the most important catalyst material. [0003] According to the type of catalytic reaction, noble metal catalysts can be divided into two categories: homogeneous catalysis and heterogeneous catalysis. The catalyst use...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J35/10B01J37/02B01J37/08B01J37/34
CPCB01J31/06B01J37/345B01J37/0009B01J37/0215B01J37/0219B01J37/0236B01J37/08B01J35/60
Inventor 周淑雁杜继山王虹
Owner 陕西瑞科新材料股份有限公司