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Catalyst for hydrogen selective catalytic combustion reaction in ethyl benzene dehydrogenation process

A technology of ethylbenzene dehydrogenation and catalytic combustion, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve the problem of insufficient catalyst selectivity and achieve high-quality hydrogen The effect of catalytic combustion selectivity, high combustion activity and good technical effect

Active Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem that the catalyst selectivity is not high enough when hydrogen selective catalytic combustion is carried out in the process of ethylbenzene dehydrogenation in the prior art. burning catalyst

Method used

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  • Catalyst for hydrogen selective catalytic combustion reaction in ethyl benzene dehydrogenation process
  • Catalyst for hydrogen selective catalytic combustion reaction in ethyl benzene dehydrogenation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 40 grams of 15% alumina sol, 60 grams of 2% glycerin solution, and 0.5 grams of Span 80 were made into slurry. Then add 0.5 grams of potassium feldspar and 40 grams of γ-Al with a particle size below 20 microns to this mixture 2 o 3 powder (specific surface area 200 m 2 / gram). After stirring for about ten minutes, add 4.0 g of Ba(MO 3 ) 2 and 1.5 g of 50% SnCl 4 As an aqueous solution, the resulting slurry was ball milled for 4 hours at room temperature to control the particle size below 10 microns. Slurry spraying to MgAl particle size 4 mm 2 o 4 On the pellet, 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 with a composition of 13% (δ-Al 2 o 3 +θ-Al 2 o 3 ) / 87%MgAl 2 o 4 . 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.

[0022] Niobium ox...

Embodiment 2

[0024] Dissolve niobium oxalate in water, heat to 80 °C, and impregnate in 4 mm-Al 2 o 3 pellets, and then dried at 150°C for 2 hours. SnCl 2 , potassium chloride, magnesium chloride and chloroplatinic acid were dissolved in water respectively, and the pH of the solution was adjusted to about 3 with HCl, and then the solution was heated to 75°C and immersed in 4 mm of -Al 2 o 3pellets, then dried at 150°C for 2 hours, and then reduced in a hydrogen atmosphere at 600°C for 2 hours to obtain Catalyst B, whose composition is shown in Table 2. The radial distribution of the constituent elements of the catalyst is measured by EDX, and the thickness of the effective active layer is 80 microns.

Embodiment 3

[0026] 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 ammonium metavanadate, 1.0 grams of hexadecyl trimethyl Ammonium bromide was made into a slurry. Then add 0.4 grams of calcium silicate, 0.3 grams of potassium carbonate and 40 grams of δ-Al with a particle size of 20 microns or less to this mixture. 2 o 3 pink. After stirring for about ten minutes, add 2.0 g of 50% SnCl 4 As an aqueous solution, 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 80°C for 2 hours, then heated to 150°C and dried again for 2 hours, and finally calcined at 900°C for 6 hours to obtain a layered composite carrier with a composition of 16% (γ -Al 2 o 3 +δ-Al 2 o 3 ) / 84% mullite. The scanning electron microscope shows that the thickness of the coatin...

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Abstract

The invention relates to a catalyst for hydrogen selective catalytic combustion reaction during ethylbenzene dehydrogenation, and mainly solves the problems of low selectivity of catalyzing and combusting hydrogen by catalysts in the prior art. By adopting the technical proposal that a carrier is loaded with a catalyst active component using 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 VB compounds; the catalyst solves the problems, and can be applied in the industrial production of the hydrogen selective catalytic combustion reaction in a process of producing phenyl alkene by ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst used for hydrogen selective catalytic combustion reaction in ethylbenzene dehydrogenation process. 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 catalyze the combustion of hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/64B01J23/62C07C15/46C07C5/48
CPCY02P20/52
Inventor 李应成卢立义翁漪
Owner CHINA PETROLEUM & CHEM CORP
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