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Catalyst for H2 selective oxidation in styrene production

An oxidation reaction and catalyst technology, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the problems of short service life and high loss rate of raw material aromatics, and achieve Effect of high combustion activity, shortened residence time, and short diffusion paths

Active 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

[0004] The technical problem to be solved by the present invention is the short service life of the catalyst and the high loss rate of raw material aromatics when the hydrogen selective oxidation reaction is carried out in the process of ethylbenzene dehydrogenation in the prior art, and a new method for ethylbenzene dehydrogenation is provided. Catalyst for the selective oxidation of hydrogen in the process

Method used

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  • Catalyst for H2 selective oxidation in styrene production
  • Catalyst for H2 selective oxidation in styrene production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 40 grams of alumina sol (containing 15% alumina by mass ratio), 60 grams of 2% glycerin solution, and 0.5 grams of Span 80 were made into a slurry. Then add 0.5 grams of potassium feldspar and 40 grams of γ-Al with a particle size of 100 microns or less to this mixture. 2 o 3 powder (specific surface area 200 m 2 / gram). After stirring for about ten minutes, add 0.85 g of Ce 2 o 3 , 2.2 grams of barium oxide and 0.2 grams of germanium dioxide, and the resulting slurry was ball milled at room temperature for 4 hours so that the particle size was controlled below 10 microns. Slurry spraying to MgAl particle size 4mm 2 o 4On the pellets, dry at 80°C for 2 hours, then heat up to 100°C and dry again for 2 hours, and finally bake at 1100°C for 6 hours to obtain a layered composite carrier. Scanning electron microscopy shows that the thickness of the coating is about 90 microns, and the specific surface area of ​​the coating is 165 meters 2 / gram.

[0017] Dissolve ch...

Embodiment 2

[0019] SnCl 2 and praseodymium chloride are dissolved in water according to the molar ratio of 1:0.5, and the above solution is impregnated in θ-Al 2 o 3 (solid-to-liquid ratio 1:2) on the powder, dried at 150°C for 2 hours, and calcined at 400°C for 4 hours. 40 grams of alumina sol (containing 15% alumina), 60 grams of 3% polyacrylamide solution, and 0.4 grams of betaine were made into slurry. Then add 0.3 grams of calcium silicate, 40 grams of θ-Al impregnated with Sn and Pr with a particle size of less than 100 microns to this mixture. 2 o 3 powder. 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 carr...

Embodiment 3

[0022] 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, 0.4 grams of lead oxide and 40 grams of δ-Al with a particle size of 100 microns or less to this mixture. 2 o 3 pink. After stirring for about ten minutes, 2.0 g of 10% neodymium chloride aqueous solution was added, and the obtained slurry was ball milled at room temperature for 4 hours to control the particle size below 10 microns. The slurry was sprayed onto mullite spheres with a particle size of 4 mm, dried at 80°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. The scanning electron microscope shows that the thickness of the coating is about 100 microns, and the specific ...

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Abstract

The invention relates to a catalyst for hydrogen selective oxidation reaction during phenyl ethylene production, and mainly solves the problems of low using efficiency and short service life of the catalyst, and high raw material loss in the prior art. The catalyst for the hydrogen selective oxidation reaction during the phenyl ethylene production comprises a kernel of an inert carrier and a layered composite carrier which is combined on the kernel and consists of an outer layer of a porous coating material, wherein the outer layer of the layered composite carrier is loaded with at least one platinum series metal selected from ruthenium, rhodium, palladium, osmium, iridium and platinum, at least one dressing agent selected from alkali metals and alkaline-earth metals, and an assistant catalyst selected from one of IVA compounds and at least one of lanthanide series compounds. The technical proposal solves the problems well, and the catalyst can be applied in the industrial production of the hydrogen selective oxidation reaction in a process of producing phenyl alkene by ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst for the selective oxidation of hydrogen in the production of styrene. Background technique [0002] Styrene is an important basic organic chemical raw material widely used in the production of plastics, rubber and resins. Catalytic dehydrogenation of ethylbenzene is the most important method for the production of styrene. The dehydrogenation of ethylbenzene to generate styrene and hydrogen is an endothermic reaction, so the bed temperature of the catalyst will decrease significantly during the reaction process, resulting in a decrease in the conversion rate of raw materials. Increasing the reaction temperature can increase the one-pass conversion of ethylbenzene, but it is still limited by thermodynamic equilibrium. A more effective way to control the reaction temperature is to introduce oxygen or oxygen-containing gas into the reaction to selectively oxidize hydrogen, that is, to catalytically burn the hydrogen ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/025C07C5/333C07C15/46
Inventor 李应成卢立义顾国耀杨为民
Owner CHINA PETROLEUM & CHEM CORP
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