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Preparation method of thin shell shaped noble metal catalyst

A precious metal catalyst and thin shell technology is applied in the field of preparation of thin shell precious metal catalysts, which can solve the problems of short life, high amount of precious metal, poor selectivity, etc., and achieve the effects of reducing the loss of raw materials, large specific surface area and reducing side reactions.

Inactive Publication Date: 2009-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of high noble metal consumption, poor selectivity and short lifespan in the preparation of thin-shell precious metal catalysts in the prior art, and a new preparation method of thin-shell precious metal catalysts is provided

Method used

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  • Preparation method of thin shell shaped noble metal catalyst
  • Preparation method of thin shell shaped noble metal catalyst
  • Preparation method of thin shell shaped noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 20 grams of aluminum sol (containing 15% mass ratio of aluminum oxide), 3.0 grams of barium oxide, 0.6 grams of zirconium oxychloride, 50 grams of mordenite powder (below 5 microns in particle size, and a specific surface area of ​​270 meters 2 / gram), 12 grams of 6% polyvinyl alcohol and 100 grams of distilled water were mixed, stirred for 1.0 hour to prepare the coating slurry, and the cordierite pellets with a diameter of 4 mm were immersed in the prepared mixed coating slurry, and placed overnight , dried at 80°C for 2 hours, then heated up to 150°C and dried again for 2 hours, and finally calcined at 1100°C for 3 hours to obtain a layered composite carrier. Analysis shows that the thickness of the coating is about 120 microns, and the specific surface area of ​​the coating is 178 meters 2 / gram.

[0023] Then the prepared composite layered support was immersed in chloroplatinic acid and palladium chloride solution with pH = 2-6, then dried at 120°C for 2 hours, fo...

Embodiment 2

[0025] 40 grams of alumina sol (containing 15% by mass ratio of alumina), 60 grams of 3% polyacrylamide solution, and 0.4 grams of betaine were prepared into slurry. Then add 0.3 grams of calcium silicate, 40 grams of θ-Al to this mixture 2 o 3 pink. After stirring for about ten minutes, add 2.0 g of 25% MgCl 2 As an aqueous solution, the resulting slurry was ball milled for 4 hours at room temperature to control the particle size below 20 microns. Slurry spraying to α-Al with a particle size of 4 mm 2 o 3 On the pellets, dry at 80°C for 2 hours, then heat up to 150°C and dry again for 2 hours, and finally bake at 800°C for 10 hours to obtain a layered composite carrier. Analysis shows that the thickness of the coating is about 80 microns, and the specific surface area of ​​the coating is 138 meters 2 / gram.

[0026] The layered composite support was impregnated in a mixed solution of lithium nitrate and palladium chloride by an equal volume impregnation method in a rot...

Embodiment 3

[0028] 35 grams of alumina sol (containing 25% mass ratio of alumina), 5 grams of 40% silica sol, 60 grams of 4% cyclodextrin solution, 2.0 grams of lanthanum oxide, 1.0 grams of hexadecyl trimethyl bromide ammonium chloride to make a slurry. Then add 0.4 grams of calcium silicate, 0.3 grams of potassium carbonate and 40 grams of pre-treated δ-Al with a size below 10 microns to this mixture 2 o 3 pink. The resulting slurry was ball milled for 4 hours at room temperature to control the particle size below 10 microns. The slurry was sprayed onto mullite pellets with a particle size of 4 mm, dried at 100°C for 2 hours, then heated to 150°C for another 2 hours, and finally calcined at 900°C for 6 hours to obtain a layered composite carrier. Analysis shows that the thickness of the coating is about 100 microns, and the specific surface area of ​​the coating is 120 meters 2 / gram.

[0029] Measure 0.16 ml concentration of 50wt% SnCl 4 solution, add water to 16 ml. Weigh out 0...

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Abstract

The invention relates to a preparation method of thin-shelled noble metal catalyst, and mainly solves the problems of the prior art of high dosage, poor selectivity and short service life of noble metal. The preparation method better solves the technical problems of the prior art by adopting the technical proposal comprising the following steps of: (a) coating the slurry of a coat porous material on the inner core of an inert carrier, drying the slurry coating and baking the slurry coating at a temperature of between 700 and 1,200 DEG C for 0.5 to 10 hours to obtain a laminar composite carrier; (b) impregnating the surface of the laminar composite carrier with a solution containing noble metal and cocatalyst components, drying the laminar composite carrier, and baking the laminar composite carrier in the air at a temperature of between 200 and 700 DEG C for 1 to 24 hours to obtain a thin-shelled catalyst precursor; and (c) reducing the thin-shelled catalyst precursor in a reducing atmosphere at a temperature between 300 and 800 DEG C for 1 to 24 hours to obtain the thin-shelled noble metal catalyst. The preparation method can be used in the industrial production of gas purification materials which are dehydrogenation-deoxidization catalysts, alkanes and aromatic hydrocarbons for selective hydrogen oxidation in a dehydrogenation process.

Description

technical field [0001] The invention relates to a preparation method of a thin-shell noble metal catalyst. Background technique [0002] The rapid development of electronics industry, semiconductor materials, modern chemical industry, metallurgy, instrumentation, aerospace and atomic energy and other industries requires more and more high-purity gases, such as high-purity hydrogen, nitrogen, oxygen, helium, argon, carbon dioxide, etc. The purification of these gases usually involves dehydrogenation and deoxygenation processes, such as the removal of hydrogen impurities in nitrogen, methane, carbon monoxide, carbon dioxide and various inert gases (nitrogen, xenon, krypton, neon, etc.) in the presence of oxygen, or in hydrogen In the presence of oxygen, the oxygen impurities in the above-mentioned gases are removed. This process can use absorption-type purifiers, such as CuO to remove H 2 , Consumable materials can also be used, such as using a carbon deoxidizer to convert o...

Claims

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Application Information

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IPC IPC(8): B01J37/025B01J29/22B01J23/40B01J23/62C07C5/333
Inventor 李应成卢立义杨为民
Owner CHINA PETROLEUM & CHEM CORP
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