Catalyst for removing hydrogen gas in carbonic oxide (CO) mixed gas by selective oxidation

A technology of selective oxidation and mixed gas, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, carbon monoxide, etc., can solve the problems of low hydrogen removal rate and high CO loss rate, and achieve short Diffusion path, reduction of side reactions, and high effective utilization

Active Publication Date: 2011-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the technical problem of high CO loss rate and low hydrogen removal rate in the process of selective ox

Method used

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  • Catalyst for removing hydrogen gas in carbonic oxide (CO) mixed gas by selective oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve ferric oxalate in water, heat to 70 °C, and impregnate in 3 mm of α-Al by vacuum rotation 2 o 3 pellets, and then dried at 120°C for 6 hours. SnCl 2 , magnesium nitrate and palladium nitrate were dissolved in water respectively, and the pH of the solution was adjusted to about 4 with HCl, and then the solution was heated to 80°C, impregnated on the carrier again, then dried at 140°C for 8 hours, and then heated at 450°C Calcined in air atmosphere for 4 hours, reduced in hydrogen atmosphere at 400°C for 2 hours to obtain catalyst A, whose composition is shown in Table 1. The radial distribution of the constituent elements of the catalyst is measured by EDX, and the thickness of the effective active layer is 130 microns.

Embodiment 2

[0026] Dissolve ferric nitrate in water, heat to 80 °C, and impregnate in 5 mm of α-Al by vacuum rotation 2 o 3 pellets, and then dried at 120°C for 4 hours. Dissolve potassium chloride and ammonium chloropalladate in water, adjust the solution with HCl to make the pH value about 4, then heat the solution to 80°C, impregnate it on the carrier again, and then dry it at 140°C for 4 hours, then Calcined in air atmosphere at 450°C for 4 hours, and reduced in hydrogen atmosphere at 400°C for 2 hours to obtain catalyst B, whose composition is shown in Table 1. 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

[0028] 40 grams of alumina sol (containing 20% ​​alumina by mass ratio), 7 grams of 35% silica sol, 70 grams of 4% cyclodextrin solution, and 10 grams of cetyltrimethylammonium bromide were prepared into a slurry. Then add 0.4 grams of potassium bicarbonate and 45 grams of δ-Al with a particle size of 30 microns or less to this mixture. 2 o 3 pink. After stirring for about 20 minutes, add 2.0 g of 50% SnCl 4 As an aqueous solution, the resulting slurry was ball milled for 6 hours at room temperature to control the particle size below 20 microns. The slurry was sprayed onto ZSM-5 molecular sieve pellets with a particle size of 2.0 mm (the ratio of silicon to aluminum was 500:1, and the specific surface area was 380 square meters per gram), dried at 80°C for 4 hours, then heated to 153°C and dried again for 4 hours , and finally calcined at 900°C for 2 hours to obtain a layered composite support with a composition of 14% (γ-Al 2 o 3 +δ-Al 2 o 3 ) / 86% ZSM-5 molecular sieve...

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Abstract

The invention relates to a catalyst for removing hydrogen gas in carbonic oxide (CO) mixed gas by selective oxidation, which mainly solves the technical problems of low hydrogen gas removing rate and high CO loss rate in the prior art. The invention adopts the technical scheme that the catalyst comprises the following components (carrier, active component and assistant) metered by simple substances in percentage by weight of the catalyst: 0.003-1% of at least one active component selected from platinum metals, 0.005-15% of at least one assistant selected from alkali metal compounds, alkali earth metal compounds or transition metal compounds, and 84-99.5% of at least one carrier selected from aluminum oxide, silicon carbide, silicon oxide, molecular sieve, magnesium oxide, zirconium oxide or titanium dioxide, thereby preferably solving the problems in the prior art. The catalyst of the invention can be used for industrial production for removing the hydrogen gas in the CO mixed gas by the selective oxidation.

Description

technical field [0001] The invention relates to a catalyst for selective oxidation and dehydrogenation of CO mixed gas, in particular to a catalyst for selective oxidation and dehydrogenation of CO coupling raw material gas for oxalate ester production. Background technique [0002] Oxalate is an important organic chemical raw material, which is widely used in the fine chemical industry to produce various dyes, medicines, important solvents, extractants and various intermediates. In the 21st century, oxalate, as a degradable and environmentally friendly engineering plastic monomer, has received extensive international attention. In addition, oxalic acid can be obtained by normal pressure hydrolysis of oxalate, and oxalamide can be obtained by normal pressure ammonia solution. Oxalate can also be used as a solvent to produce pharmaceutical and dye intermediates, etc., such as various condensation reactions with fatty acid esters, cyclohexylacetophenone, amino alcohols, and m...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/835B01J23/78B01J23/62B01J23/656B01J23/83B01J23/648B01J23/644C01B31/18C01B32/40
Inventor 李斯琴刘俊涛蒯骏李蕾
Owner CHINA PETROLEUM & CHEM CORP
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