Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for reclaiming precious metal from metallic carrier catalyst device

A catalyst device and metal carrier technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as difficult selective separation of catalyst layers

Inactive Publication Date: 2007-03-07
ISHIFUKU METAL IND CO LTD
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, although the reaction proceeds smoothly when the acid solution is consumed in the dissolution of the catalyst layer, if the catalyst layer becomes small, the metal support substrate is rapidly dissolved, so there is a problem that it is difficult to selectively separate the catalyst layer.

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 reclaiming precious metal from metallic carrier catalyst device
  • Method for reclaiming precious metal from metallic carrier catalyst device

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0027] Coat 140g of activated alumina on a heat-resistant stainless steel honeycomb body with a diameter of 900mm and a height of 1260mm (hereinafter referred to as a metal carrier; a capacity of 800cc). After sintering, 0.3g of platinum (Pt), 2.3g of Palladium (Pd) and 0.3g rhodium (Rh) are used to make a metal supported catalyst device.

Embodiment 1

[0029] According to the flow chart shown in FIG. 1, the metal supported catalyst device prepared in Reference Example 1 was immersed in an aqueous solution containing 20% ​​by weight of sulfuric acid and 2% by weight of nitric acid, and treated at 80° C. for 5 hours. After standing to cool, the metal carrier (1) was taken out from the aqueous solution, the metal carrier was washed with water, and the washing solution was mixed with the aqueous solution to obtain an aqueous solution (2) containing undissolved residues. The recovered metal support was identical in appearance to the metal support before being coated with activated alumina, without any trace of dissolution.

[0030] Filter the aqueous solution (2), after separating the undissolved residue (3) from the aqueous solution (4), add 10 g of iron (Fe) powder in the aqueous solution (4) and carry out reduction treatment, so that the noble metal (Pt, Pd, Rh) components (5 ) precipitation and recovery. Next, the recovered ...

Embodiment 2

[0032] According to the flow chart shown in Fig. 1, the metal carrier catalyst device that will make in reference example 1 is immersed in the aqueous solution that contains 20% by weight sulfuric acid and 2% by weight nitric acid, handles 5 hours at 80 ℃, metal carrier (1 ) was taken out from the above aqueous solution, then dipped into a newly prepared aqueous solution containing 20% ​​by weight of sulfuric acid and 2% by weight of nitric acid, and then treated at 80° C. for 5 hours. After standing to cool, the metal support was washed with water, and the washing solution was mixed with the aqueous solution to obtain an aqueous solution (2) containing undissolved residue. The recovered metal support was identical in appearance to the metal support before being coated with activated alumina, without any trace of dissolution.

[0033] Filter the aqueous solution (2), after separating the undissolved residue (3) from the aqueous solution (4), add 10 g of iron (Fe) powder in the...

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

A method for recovering a wash coat carrying a noble metal component from a catalyst device having a metal carrier, which comprises treating the catalyst device having a metal carrier provided with a wash coat and, carried thereon, a catalyst component containing a noble metal with an aqueous mixed acid solution containing sulfuric acid and nitric acid. The method can be employed for separating and recovering a wash coat carrying a catalyst component containing a noble metal from the metal carrier of a used catalyst device having a metal carrier for use in the clarification of an exhaust gas from an internal combustion engine, without substantially crashing or dissolving said metal carrier with good efficiency.

Description

technical field [0001] The invention relates to a method for separating and recovering a loaded coating containing precious metal catalyst components from the metal carrier of a used metal carrier catalyst device, and further recovering the precious metal. Background technique [0002] As catalyst supports used in catalyst devices for purifying exhaust gas of internal combustion engines, there are ceramic supports and metal supports. [0003] As a method for recovering precious metals from ceramic supported catalyst devices, acid dissolution using hydrochloric acid, aqua regia, etc. is generally used. However, when this acid dissolution method is applied to a metal support catalyst device, a large amount of acid is required to dissolve the metal support, and there is a problem that it is difficult to efficiently separate the noble metal from the solution. [0004] Therefore, various proposals have been made for methods of recovering precious metals from metal-supported cata...

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): B01J38/00B01J23/46B01J37/02B01J38/60C22B3/06C22B3/08C22B3/46
CPCC22B11/048B01J23/464B01J37/0225B01J38/60C22B3/065C22B3/08C22B3/46Y02P10/20
Inventor 中津滋横田幸尚
Owner ISHIFUKU METAL IND CO LTD