Catalyzer for purifying CO under certain environmental condition

A technology of catalysts and composite oxides, applied in the direction of physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, chemical instruments and methods, etc. Inability to obtain low-temperature active loaded gold catalysts and other issues, to achieve good anti-sulfur poisoning and good anti-water vapor poisoning effects

Inactive Publication Date: 2006-01-25
NO 63971 TROOPS PLA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the pretreatment is more complicated, and at room temperature, it cannot play an effective role
However, if gold is supported on a single carrier Al 2 o 3 In general, supported gold catalysts with low-temperature activity are generally not available. If gold is supported on a single transition metal oxide, the prepared catalyst generally has considerable difficulties in the process of realizing industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] Example 1: A gold catalyst was prepared by deposition and precipitation. Take the shaped composite oxide support CoOx / Al 2 o 3 1.0g, it was added to distilled water, under vigorous stirring with 0.5M Na 2 CO 3 The solution was adjusted to pH 8. Heating and maintaining the system temperature at 70°C. Then add 0.25 mL of 0.1M chloroauric acid dropwise, while continuing to add 0.5M Na 2 CO 3 To maintain the pH of the system at 8. After reacting for 1 hour, filter, wash, dry overnight at 90°C, and then bake at 400°C to obtain Au:CoOx:CoOx / Al 2 o 3 Au / CoOx / Al with a weight ratio of 1:10:200 2 o 3 catalyst. The finished product is in the form of small balls with a uniform black color.

[0012] The raw gas composition is CO: 0.5%, O 2 : 21%, N 2 : 78.5% (volume percentage), gas volume space velocity is 8000h -1 , the catalyst catalyzes the complete conversion of CO to CO 2 The allowable minimum reaction temperature is -18°C (255K).

example 2

[0013] Example 2: A gold catalyst was prepared using the deposition precipitation method described in Example 1. Take the shaped composite oxide support CoOx / Al 2 o 3 1.0g, it was added to distilled water, and 5.0g of urea was added under vigorous stirring. Then add 0.25mL of 0.1M chloroauric acid, heat, and maintain the system temperature at 70°C until the pH value of the system reaches 8.0. Filter, wash, dry overnight at 90°C, and then bake at 400°C to obtain Au:CoOx:CoOx / Al 2 o 3 Au / CoOx / Al with a weight ratio of 1:10:200 2 o 3 catalyst. The finished product is in the form of small balls with a uniform black color.

[0014] When using the feed gas and gas volume space velocity described in Example 1, the catalyst catalyzes CO completely into CO 2 The allowable minimum reaction temperature is below -30°C (<243K).

example 3

[0015] Example 3: 1.0g FeOx / Al 2 o 3 The carrier was added to distilled water, and the deposition and precipitation method described in Example 2 was used to prepare Au: FeOx: FeOx / Al 2 o 3 Au / FeOx / Al with a weight ratio of 1:10:200 2 o 3 catalyst. The finished catalyst is in the shape of small balls and is uniformly black.

[0016] When using the feed gas and gas volume space velocity described in Example 1, the catalyst catalyzes CO completely into CO 2 The allowable minimum reaction temperature is below -30°C (<243K).

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PUM

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Abstract

A catalyst for convering CO to CO2 isn environmental condition in order to clean air is composed of gold as its active component and MOx / Al2O3 as carrier, where MOx may be CoOx or FeOx, MiOx, MnOx, CuOx and ZnOx. With it the CO can be converted to CO2 at -30-50 deg.C, in ordinary ambient condition.

Description

Technical field [0001] The invention is a catalyst capable of catalytically purifying CO under ambient temperature and ambient humidity. It is mainly used for various anti-CO protective masks and devices, as well as for indoor air purification, especially in some special or closed environments. Background technique [0002] The CO purification catalytic material used for a long time in the past is Hopcalite (mainly Cu, Mn composite oxide). Judging from the current situation in our country, the CO purification material equipped on some large protective devices is mainly Hopcalite. The catalyst has a good effect of catalyzing CO at room temperature, but its water resistance is extremely poor, and it will fail when encountering a small amount of water, so it is difficult Long-term use and storage. [0003] Supported noble metal platinum and palladium catalysts have always been more effective catalysts for CO oxidation. Pt / SnOx [Stark D.S., Haris M.R.J. Phys.E 1988, 21:715] h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01D53/62B01D53/86
Inventor 王东辉郝郑平程代云史喜成
Owner NO 63971 TROOPS PLA
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