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Method for preparing nano-catalyst by using platinum group metal in waste gas treatment catalyst

A technology of nano-catalysts and platinum group metals, applied in metal processing equipment, nanotechnology for materials and surface science, nanotechnology, etc., to achieve the effects of simple devices, reduced production costs, and low-cost preparation of raw materials

Pending Publication Date: 2022-02-15
湖北华德莱节能减排科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention proposes a method for preparing nano-catalysts using platinum group metals in exhaust gas treatment catalysts to solve or at least partially solve the technical problems existing in the prior art

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  • Method for preparing nano-catalyst by using platinum group metal in waste gas treatment catalyst
  • Method for preparing nano-catalyst by using platinum group metal in waste gas treatment catalyst
  • Method for preparing nano-catalyst by using platinum group metal in waste gas treatment catalyst

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Embodiment 1

[0052] A method for preparing nano-catalysts using platinum group metals in exhaust gas treatment catalysts, comprising the following steps:

[0053] S1. Add an oxidant to the hydrochloric acid solution to obtain a mixed solution; wherein the volume of the mixed solution is 1 L, the concentration of the mixed solution hydrochloric acid is 5mol / L, the oxidant is hydrogen peroxide, and the mass concentration of the hydrogen peroxide in the mixed solution is 5%;

[0054] S2, the Pt-Rh type automobile exhaust treatment catalyst (the mass content of Rh in this catalyst is relatively low, and the mass content of Rh is only 1 / 15~1 / 20 of the mass content of Pt) is crushed and ground until the particle size is 100 mesh , and set aside; then 100 g of the ground exhaust gas treatment catalyst was added to the mixed solution and stirred at 25° C. for 6 hours, and the platinum group metal leach solution was obtained after solid-liquid separation, wherein the leaching rate of Pt was 96.62%, ...

Embodiment 2

[0064] A method for preparing nano-catalysts using platinum group metals in exhaust gas treatment catalysts, comprising the following steps:

[0065] S1, add oxidant to hydrochloric acid solution, obtain mixed solution; Wherein the volume of mixed solution is 500mL, the concentration of mixed solution hydrochloric acid is 9mol / L, oxidant is sodium hypochlorite, and the molar concentration of sodium hypochlorite in mixed solution is 0.1mol / L;

[0066] S2, breaking and grinding the Pd-Rh type automobile exhaust gas treatment catalyst (the mass content of Rh in the catalyst is relatively low, and the mass content of Rh is only 1 / 15 to 1 / 20 of the mass content of Pd) and ground until the particle size is 100 mesh , set aside; then 100g of the ground waste gas treatment catalyst was added to the mixed solution and stirred at 25°C for 6h, and the platinum group metal leachate was obtained after solid-liquid separation, wherein the leaching rate of Pt was 97.30%, and the leaching rate...

Embodiment 3

[0073] A method for preparing nano-catalysts using platinum group metals in exhaust gas treatment catalysts, comprising the following steps:

[0074] S1, add oxidant to hydrochloric acid solution, obtain mixed solution; Wherein the volume of mixed solution is 2L, the concentration of mixed solution hydrochloric acid is 7mol / L, oxidant is chlorine, and the concentration of chlorine in mixed solution is 0.05 mole per liter;

[0075] S2. Crush and grind the waste gas treatment catalyst Pt-Pd metal industrial waste gas catalyst to a particle size of 100 mesh, and set aside; then add 100g of the ground waste gas treatment catalyst to the mixed solution and stir at 25°C for 8 hours, and separate the solid and liquid Finally, a platinum group metal leaching solution was obtained, wherein the Pt leaching rate was 95.41%, and the Pd leaching rate was 97.85%;

[0076] S3, evaporating and concentrating the leach solution of platinum group metals to obtain a precursor solution of platinum...

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Abstract

The invention provides a method for preparing a nano-catalyst by using platinum group metals in a waste gas treatment catalyst. The method comprises the following steps of: adding an oxidant into a hydrochloric acid solution to obtain a mixed solution; adding a waste gas treatment catalyst into the mixed solution, and acquiring platinum group metal leachate after stirring leaching and solid-liquid separation; concentrating the platinum group metal leachate to obtain a precursor solution; and reducing the precursor solution by adopting a reduction method to obtain a platinum group metal nano-catalyst. According to the method, highly toxic reagents such as cyanide do not need to be used, harmful substances are not generated in the treatment process, the process is green and environment-friendly, operation is easy and convenient, devices are simple, investment is small, and the method is flexibly suitable for production of various scales; and the components of the leaching solution are optimized, the waste gas treatment catalyst leaching solution can be directly used for preparing the platinum group metal nano-catalyst, generation of secondary pollution such as a large amount of acid wastewater is avoided, and the complex metal separation and purification step is omitted.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a method for preparing nanometer catalysts by using platinum group metals in waste gas treatment catalysts. Background technique [0002] Platinum group metals are rare and precious metals, which are widely used in jewelry, electronic components, exhaust gas treatment catalysts, chemical catalysts, energy storage and other fields, and support the development of many strategic emerging industries. With the vigorous development of applications such as hydrogen energy and fuel cells, my country's demand for platinum group metals will also increase sharply. my country's platinum group metal mineral reserves are small, the amount of use is large, and the dependence on foreign countries is high. The secondary resource recovery of platinum group metals is imperative. [0003] Exhaust gas treatment catalysts use platinum group metals such as platinum, palladium, iridium, an...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00B22F1/054B22F9/24C25B1/04C25B11/054C25B11/065C25B11/081H01M4/92B82Y30/00
CPCC22B7/007C22B11/048B22F9/24C25B1/04C25B11/081C25B11/054C25B11/065B82Y30/00H01M4/921H01M4/926Y02E60/36Y02E60/50
Inventor 吴旭韦聚才石霖易娟吴怀德
Owner 湖北华德莱节能减排科技有限公司
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