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Prep. of high-load bi-and multi-component precious metallic catalyst

A precious metal catalyst and loading capacity technology, which is applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc. Ideal, high carrier specific surface area and other issues, to achieve the effect of improving metal utilization, reducing preparation costs, and high metal utilization

Inactive Publication Date: 2003-10-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of method can be used to prepare multi-component catalysts, but this type of method has higher requirements for the carrier, requires a higher specific surface area of ​​the carrier, and this type of method is not easy to achieve a high degree of dispersion of precious metals
For noble metal catalysts with high loads, the preparation effect of this method is not very ideal

Method used

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  • Prep. of high-load bi-and multi-component precious metallic catalyst
  • Prep. of high-load bi-and multi-component precious metallic catalyst
  • Prep. of high-load bi-and multi-component precious metallic catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: Preparation of PtRu / C (30PtRu%, Pt / Ru=1) electrode catalyst

[0044] Activated carbon XC-72R was pre-treated with 5 mol / L nitric acid solution, dried at 200°C for 4 hours, weighed 5 grams and dispersed with 400 ml of ethylene glycol for 30 minutes by ultrasonic oscillation to prepare carbon slurry. 3.9 gram of chloroplatinic acid (containing 1.44 gram of platinum) and 1.94 gram of ruthenium trichloride (containing 0.72 gram of ruthenium) are dissolved in 50 milliliters of deionized water and are formulated with platinum-ruthenium mixed solution, and ultrasonic oscillation is transferred to the carbon slurry after 20 minutes, and passed After argon deoxygenation and stirring for 4 hours, add 50 ml of 1 mol / L sodium hydroxide / ethylene glycol solution, continue stirring for 4 hours, then raise the temperature to 185°C and keep it for 4 hours, then cool down to 25°C, adjust with dilute hydrochloric acid solution The pH value reached 3, and after stirring for 3...

Embodiment 2

[0045] Embodiment 2: Preparation of PtRu / C (60PtRu%, Pt / Ru=1) anode catalyst

[0046] Activated carbon XC-72R was pre-treated with 5mol / L nitric acid solution, dried at 200°C for 4 hours, weighed 2 grams and dispersed with 150 ml of ethylene glycol aqueous solution (95% ethylene glycol content) for 30 minutes to obtain carbon slurry . Measure 40 milliliters of chloroplatinic acid / ethylene glycol solution (50 mg platinum / ml), measure 25 milliliters of ruthenium trichloride aqueous solution (40 mg ruthenium / ml) and mix, and add dropwise in the carbon slurry after ultrasonic oscillation for 20 minutes, After stirring for 4 hours with argon deoxygenation, 15 ml of 1.5 mol / L sodium hydroxide / ethylene glycol solution was added dropwise, and the stirring was continued for 4 hours, then the temperature was raised to 180°C and kept for 4 hours, then the temperature was lowered to 25°C, and 1.5 mol 1 / liter of dilute hydrochloric acid solution to adjust the pH value to 2.5, after stirri...

Embodiment 3

[0047] Embodiment 3: the preparation of PtRu / C (90PtRu%, Pt / Ru=1) catalyst

[0048] Activated carbon XC-72R was pre-treated with 5 mol / L nitric acid solution, dried at 200°C for 4 hours, weighed 1 gram and dispersed with 60 ml of ethylene glycol for 30 minutes by ultrasonic oscillation to prepare carbon slurry. Measure 120 ml of chloroplatinic acid / ethylene glycol solution (50 mg platinum / ml), measure 60 ml of ruthenium trichloride / ethylene glycol (50 mg ruthenium / ml) and mix, ultrasonically oscillate for 50 minutes and mix with carbon slurry After stirring for 10 hours with argon deoxygenation, add 10 ml of 2.5 mol / L sodium hydroxide solution dropwise, continue stirring for 5 hours, then raise the temperature to 180°C and keep it for 6 hours, then cool down to 25°C, and use 1.5 mol / L Adjust the pH value of the dilute hydrochloric acid solution to 2.5, stir for 5 hours, filter, and the filtrate is clear and transparent. The solid was vacuum-dried at 70°C for 8 hours to obtain...

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Abstract

The present invention is preparation process of two-component and multiple-component loaded catalyst with relatively high loaded amount and containing noble metal(s) of Pt, Pd, Ru, Os, Ir, Rh, Re, etc. and other transition metal(s). By means of altering the solvent composition in dispersion system, raising the viscosity of solvent and lowering the diffusion rate of metal particles inside the solution effectively, it is possible to prevent the mutual polymerization and enlarging of metal particles without adopting macro molecule surfactant in preparing two-component and multiple-component loaded nanometer-level noble metal-based catalyst with high dispersivity and great loaded amount. Several kinds of metal may be loaded onto the carrier in once process while ensuring high metal dispersivity even in case of high metal loading amount.

Description

technical field [0001] The invention belongs to the technical field of producing catalysts by chemical and chemical engineering methods, and in particular relates to a preparation method of supported two-component and multi-component catalysts based on precious metals. Background technique [0002] For low-content supported metal catalysts, there are already very mature preparation methods, and it is easy to make the supported metals highly dispersed. This type of catalyst is also relatively easy to prepare. The more common method is to first impregnate the precious metal precursor in Carrier, and then reduce at a certain temperature. However, it is not easy to achieve a high degree of dispersion of supported metals for high-loaded supported metal catalysts, especially bicomponent and multicomponent metal catalysts, which have a wider range of applications, resulting in low utilization of noble metals. [0003] Electrode catalysts used in low-temperature fuel cells such as ...

Claims

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Application Information

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IPC IPC(8): B01J23/40B01J37/02B01J37/16
Inventor 辛勤周卫江周振华李文震孙公权魏昭彬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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