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Thin shell type catalyst and preparation method thereof

A catalyst and thin-shell technology, applied in the field of thin-shell catalysts, can solve the problems of shell precious metal loss and easy wear, and achieve the effect of excellent activity and stability

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of loss of precious metals in the shell caused by the easy abrasion of the surface of the catalyst used in the hydrogen selective oxidation reaction that exists in the prior art. Thin-shell Catalysts for Selective Oxidation of Hydrogen

Method used

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  • Thin shell type catalyst and preparation method thereof
  • Thin shell type catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put 10 grams of small spherical particle thin-shell carrier AI whose core is mullite, thin shell is γ-alumina, and the shell thickness is 0.21 mm, into 50 mL of oxalic acid aqueous solution with a concentration of 0.01 mol / L for 10 min. Afterwards, the pellets were filtered out, and dried in an oven at 120° C. for 14 hours to obtain the thin-shell carrier AII.

[0035] Dissolve ammonium chloroplatinate in water to prepare a solution. Put the thin-shell carrier AII impregnated with oxalic acid into 40mL ammonium chloroplatinate solution for impregnation, then dry at 90°C for 24 hours, then bake at 400°C for 20 hours, and cool to room temperature to obtain a non-uniform distribution of Pt in the shell The thin-shell catalyst A. Elemental analysis showed that the mass fraction of Pt in the catalyst was 0.0502%.

[0036] The attrition rate of the thin-shell catalyst A was determined to be 0.80% according to the method of the standard HG / T 2976-1999, and the mass fraction ...

Embodiment 2

[0045] Put 10 grams of small spherical particle thin-shell carrier BI whose core is silicon carbide, thin shell is δ-alumina, and shell thickness is 0.33 mm into 50 mL of tartaric acid aqueous solution with a concentration of 0.05 mol / L for 8 minutes. After dipping The pellets were filtered out and dried in an oven at 100°C for 20 hours to obtain the thin-shell carrier BII.

[0046] Dissolve triruthenium dodecacarbonyl in water to prepare a solution. The thin-shell carrier BII impregnated with tartaric acid was immersed in 40 mL of triruthenium dodecacarbonyl solution, then dried at 100°C for 2 hours, then calcined at 300°C for 24 hours, and cooled to room temperature to obtain Ru in the shell. Evenly distributed thin-shell catalyst B. Elemental analysis showed that the mass fraction of Ru in the catalyst was 0.688%.

[0047] The attrition rate of the thin-shell catalyst B was determined to be 0.46% according to the method of the standard HG / T 2976-1999, and the mass fractio...

Embodiment 3

[0051] Put 10 grams of thin-shell carrier CI with spinel as the inner core, θ-alumina as the thin shell, and a shell thickness of 0.35 mm into 50 mL of citric acid aqueous solution with a concentration of 0.20 mol / L for 6 min. After impregnation, the pellets were filtered out and dried in an oven at 100°C for 5 hours to obtain the thin-shell carrier CII.

[0052] Dissolve ammonium hexachloroosmate in water to make a solution. Put the thin-shell carrier CII impregnated with citric acid into 40mL ammonium hexachloroosmate solution for impregnation, then dry at 100°C for 15 hours, then bake at 500°C for 8 hours, and cool to room temperature to obtain Os in the shell Non-uniformly distributed thin-shell catalyst C. Elemental analysis showed that the mass fraction of Os in the catalyst was 0.3040%.

[0053] The attrition rate of the thin-shell catalyst C was determined to be 0.27% by the method of the standard HG / T 2976-1999, and the mass fraction of Os in the catalyst with the a...

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Abstract

The invention relates to thin shell type catalyst of which the active ingredients are non-uniformly distributed in the shell layer. The problem in the prior art that precious metals in the shell layer are lost because the shell layer of the thin shell type catalyst is worn is mainly solved. With the adoption of the technical scheme, the thin shell type catalyst of which the active ingredients are non-uniformly distributed in the shell layer comprises an inert carrier core, and a porous material shell layer bound to the core, wherein at least one platinum metal active ingredient is loaded to the shell layer; and the content of the platinum metal active ingredients on the surface of the shell layer is lower than the content at the inner side of the shell layer. The problem is well solved, and the catalyst can be used for hydrogen selectivity oxidizing reaction in the process of producing unsaturated hydrocarbons through dehydrogenation of aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a thin-shell catalyst with non-uniform distribution of active components. Background technique [0002] The combustion reaction is a process in which the combustible components in the mixture react rapidly with oxygen to release a large amount of heat and intense light. The essence of combustion is the reaction of oxidation of combustible components. Catalytic combustion is to achieve the complete oxidation of combustible components at a relatively low temperature with the help of a catalyst. Catalytic combustion reduces energy consumption and is safe and efficient. [0003] Typical catalytic combustion catalysts use noble metals (mainly platinum and palladium) as active components, and the active components of early combustion catalysts are almost evenly distributed in the catalyst. Due to the high price of noble metal catalysts and the lack of resources, people have paid special attention to the development and research of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J27/224B01J23/46B01J29/00B01J23/44C07C15/46C07C5/48
Inventor 邵一凡孙清卢立义缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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