Catalyst selective oxidation reaction of hydrogen gas

An oxidation reaction and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the loss of raw materials for dehydrogenation compounds, poor selectivity, low activity, etc. problem, to achieve the effect of shortened residence time, thin effective active layer and high combustion activity

Active Publication Date: 2009-05-13
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 problem of low activity and poor selectivity when the by-product hydrogen is oxidized in the process of dehydrogenating satu

Method used

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  • Catalyst selective oxidation reaction of hydrogen gas
  • Catalyst selective oxidation reaction of hydrogen gas

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% polyvinyl alcohol solution, and 0.5 grams of Tween were prepared into a slurry. Then add 0.4 grams of calcium silicate and 40 grams of γ-Al with a particle size of 100 microns or less to this mixture. 2 o 3 pink. After stirring for about ten minutes, 1.5 grams of 50% tin tetrachloride 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. Slurry spraying to α-Al with a particle size of 4 mm 2 o 3 On the sphere, dry at 80°C for 2 hours, then heat up to 100°C and dry again for 2 hours, and finally bake at 1050°C for 8 hours to obtain a layered composite carrier. The scanning electron microscope shows that the thickness of the coating is about 80 microns, and the specific surface area of ​​the coating is 73 meters 2 / gram.

[0017]Dissolve lithium nitrate, sodium nitrate and chloroplatinic acid in w...

Embodiment 2

[0019] 40 grams of alumina sol (containing 15% by mass of alumina), 60 grams of 3% cyclodextrin solution, and 0.2 grams of tetraethylammonium bromide were prepared into a slurry. Then add 0.3 grams of potassium feldspar and 40 grams of θ-Al with a particle size of 100 microns or less to this mixture. 2 o 3 pink. After stirring for about ten minutes, add 2.0 grams of 50% tin dichloride and 1.1 grams of MgCl 2 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 magnesium-aluminum spinel spheres 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 1000°C for 10 hours to obtain a layered composite carrier. The scanning electron microscope shows that the thickness of the coating is about 120 microns, and the specific surface area of ​​the coating is 105 meters 2 / gram.

[0020] Dissolve...

Embodiment 3

[0022] 35 grams of alumina sol (containing 25% mass ratio of alumina), 5 grams of 40% silica sol, 60 grams of 4% carboxyethyl cellulose solution, 1.0 grams of P123 (water-soluble polyoxyethylene-polyoxypropylene - polyoxyethylene triblock copolymer, trade name Pluronics) made into slurry. Then add 0.4 grams of calcium silicate 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, 2.5 grams of 50% tin tetrachloride and 1 gram of 8% lead nitrate aqueous solution were 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 cordierite spheres 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 1200°C for 2 hours to obtain a layered composite carrier. Scanning electron microscopy shows that the thickness of the coating is about ...

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Abstract

The invention relates to a catalyst used in a selective oxidation reaction of hydrogen gas, and mainly solves the problems of low catalytic activity, poor selectivity and heavy loss of dehydrogenation chemical materials. In order to solve the problems, the technical scheme is as follows: the catalyst used in the selective oxidation reaction of hydrogen gas comprises a layered composite carrier, which comprises an inert carrier inner core and a porous coating as an outer layer conjugated on the inner core; and at least one platinum metal selected from Ru, Rh, Pd, Os, Ir and Pt, at least one modifier selected from alkali metals and alkaline earth metals, and at least one catalyst promoter selected from IVA compounds are loaded on the layered composite carrier. The catalyst is applied to the selective oxidation reaction of hydrogen gas in the industrial production of unsaturated hydrocarbons by alkane dehydrogenation or aromatic hydrocarbon dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst for hydrogen selective oxidation reaction. Background technique [0002] Catalytic dehydrogenation has many important applications in the petrochemical and petroleum refining industries. The dehydrogenation of saturated hydrocarbons to produce unsaturated hydrocarbons is an important process in the petrochemical industry, especially the catalytic dehydrogenation of low-carbon alkanes to olefins and the dehydrogenation of saturated aromatics to unsaturated aromatics has opened up the source of unsaturated hydrocarbons An effective way, thus has important industrial value. Such as butane or C4 olefin dehydrogenation to produce butadiene, n-paraffin dehydrogenation, ethylbenzene catalytic dehydrogenation to produce styrene, etc. Since the dehydrogenation reaction is an endothermic reaction, the bed temperature of the catalyst will decrease significantly during the reaction process, resulting in a decrease in the conve...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J23/58B01J37/025C07C5/333
Inventor 李应成卢立义顾国耀杨为民
Owner CHINA PETROLEUM & CHEM CORP
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