Method for preparing Pt/C catalyst from platinum-containing waste catalyst

A technology of spent catalysts and catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems such as high raw material costs, complicated operations, and environmental pollution. Achieve the effect of low cost, simple operation and short process

Inactive Publication Date: 2019-01-04
UNIV OF SCI & TECH BEIJING
View PDF11 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned preparation method has high cost of raw materials, complex operation and a large amount of waste liquid will be generated in the process, polluting the environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing Pt/C catalyst from platinum-containing waste catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After the platinum-containing waste catalyst was roasted at 700°C for 8 hours, it was oxidized to chloroplatinic acid by hydrogen peroxide under the condition of hydrogen ion concentration of 6.0 mol / L in the system. The crude chloroplatinic acid solution was obtained by filtration. Chloroplatinic acid solution was obtained by extraction with tert-butylamine. The volume ratio of tert-butylamine to crude chloroplatinic acid aqueous solution was 0.5:1, and then back-extracted with 5.0 mol / L sodium hydroxide solution to obtain a solution in which 99% of the solute was sodium chloroplatinate. Mix carbon black with 99% of the solute solution of sodium chloroplatinate in a reaction kettle, add formaldehyde and reduce sodium chloroplatinate for 3 hours at 20°C to obtain a Pt / C powder with a Pt loading of 10%, after filtration, Wash and dry to obtain Pt / C catalyst.

Embodiment 2

[0033] After the platinum-containing spent catalyst was calcined at 800°C for 6 hours, it was oxidized to chloroplatinic acid by hydrogen peroxide under the condition of hydrogen ion concentration of 4.0 mol / L in the system. The crude chloroplatinic acid solution was obtained by filtration. Chloroplatinic acid solution was obtained by extraction with tert-butylamine. The volume ratio of tert-butylamine to crude chloroplatinic acid aqueous solution was 0.75:1, and then back-extracted with 4.0mol / L sodium hydroxide solution to obtain a solution in which 99.1% of the solute was sodium chloroplatinate. Mix carbon black with a solution of 99.1% sodium chloroplatinate as the solute in a reaction kettle, add formaldehyde and reduce sodium chloroplatinate at 40°C for 2.5h to obtain Pt / C powder with a Pt loading of 9%, and filter , washing and drying to obtain a Pt / C catalyst.

Embodiment 3

[0035] After the platinum-containing waste catalyst was calcined at 900°C for 4 hours, it was oxidized to chloroplatinic acid by hydrogen peroxide under the condition of hydrogen ion concentration of 2.0 mol / L in the system. The crude chloroplatinic acid solution was obtained by filtration. Chloroplatinic acid solution was obtained by extraction with tert-butylamine. The volume ratio of tert-butylamine to crude chloroplatinic acid aqueous solution was 1:1, and then back-extracted with 3.0mol / L sodium hydroxide solution to obtain a solution in which 99.3% of the solute was sodium chloroplatinate. Mix carbon black with 99.3% of the solute solution of sodium chloroplatinate in a reaction kettle, add formaldehyde and reduce sodium chloroplatinate at 60°C for 2 hours to obtain Pt / C powder with a Pt loading of 8%, filter, Wash and dry to obtain Pt / C catalyst.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of recycling of precious metal, and particularly relates to a method for preparing a Pt / C catalyst from a platinum-containing waste catalyst. The method comprises the following steps: roasting, oxidizing and filtering the platinum-containing waste catalyst to obtain a coarse chloroplatinic acid solution; then extracting and reversely extracting to obtain a sodium chloroplatinate solution; and finally mixing the sodium chloroplatinate solution with a carbon black carrier and reducing, filtering and drying to obtain the Pt / C catalyst. The Pt / C catalyst prepared by the method is good in dispersity and high in stability, high-valued reusing of the platinum-containing waste catalyst is realized, the process is simple, and industrialized application is facilitated.

Description

technical field [0001] The invention mainly belongs to the technical field of precious metal recovery and utilization, and in particular relates to a method for preparing a Pt / C catalyst from a platinum-containing waste catalyst. Background technique [0002] Due to their unique physical and chemical properties, in addition to being used as jewelry and currency, platinum group metals are also widely used in aerospace, electronic information, automobile manufacturing, petrochemical and military industries, and are listed as strategic materials. my country's platinum group metal resources are very scarce, mainly relying on imports. Therefore, it is of great significance to carry out the recycling of secondary resources of platinum group metals. [0003] In the prior art, there are mainly two processes for recovering platinum from spent catalysts: fire method and wet method. Chinese patent CN107190147 A discloses that the spent catalyst is roasted and decarburized, then groun...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42
CPCB01J23/42
Inventor 张深根刘波李佳怡丁云集
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap