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Exhaust gas denitration catalyst, co oxidation catalyst, exhaust gas treatment system, and exhaust gas treatment method

A technology of denitrification catalyst and oxidation catalyst, which is applied in the direction of chemical instruments and methods, gas treatment, physical/chemical process catalysts, etc., can solve the problems of catalyst performance degradation, performance degradation, and limitation of CO oxidation catalyst selection options, etc., to achieve good denitrification The effect of nitrogen properties

Inactive Publication Date: 2019-02-05
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the choice of CO oxidation catalysts that can be applied in such exhaust gases is limited
If a general platinum / alumina-based CO oxidation catalyst is used, there will be SO x Tendency to cause reduced catalyst performance in the short term
[0010] On the other hand, as also confirmed by the examples described later, if the resistance to SO x Excellent Pt / TiO 2 The inventors of the present inventors confirmed that the performance deteriorated in a short period of time when evaluation was performed using actual gas from a sintering furnace, etc.
If the oxidation ability is high, at the same time SO x is also oxidized, due to SO 3 Increased smog generation may increase the impact of sulfuric acid corrosion on the back-stage machines

Method used

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  • Exhaust gas denitration catalyst, co oxidation catalyst, exhaust gas treatment system, and exhaust gas treatment method
  • Exhaust gas denitration catalyst, co oxidation catalyst, exhaust gas treatment system, and exhaust gas treatment method
  • Exhaust gas denitration catalyst, co oxidation catalyst, exhaust gas treatment system, and exhaust gas treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Example 1 (Preparation of exhaust gas denitrification catalyst as honeycomb catalyst)

[0143] With respect to the total amount of iridium and barium sulfate, dilute the iridium(II) chloride solution (H 2 IrCl 6 ), in the aqueous solution, impregnated barium sulfate (BaSO 4 ), evaporate to dryness at 140°C, and calcinate the obtained catalyst at 500°C for 5 hours in the atmosphere to prepare BaSO with iridium 4 Powder catalyst.

[0144] 1200g of the catalyst and commercially available colloidal silica (silica sol, containing 20% ​​by mass SiO 2 ) 681.6 g, 38.4 g of alumina sol, and 3907.2 g of ion-exchange water are ground and mixed with a ball mill to prepare a slurry for washing.

[0145] A honeycomb (4.2 mmp, 0.55 mmt, 5 holes×10 holes×500 mL) was immersed in the prepared slurry. The excess liquid in the cell pores of the honeycomb is blown off with compressed air.

[0146] After that, the honeycomb was fired at 500°C for 5 hours, and 100g / m was coated on the honeycomb 2 Th...

Embodiment 2

[0147] Example 2 (Activity Evaluation Test of Honeycomb Catalyst)

[0148] The honeycomb catalyst prepared in Example 1 was subjected to an activity evaluation test. The exhaust gas temperature at the catalyst inlet was 180 to 360°C, and the following gas composition was used to evaluate AV=10.3 [Nm / hr]. Also, AV means area velocity (gas amount / total contact area of ​​catalyst), and the unit of AV is Nm 3 / m 2 ·H, expressed as (m 3 (normal)) / m 2 ·H.

[0149] Reactive gas composition:

[0150] NO: 100ppm

[0151] CO: 10000ppm

[0152] CO 2 : 10%

[0153] H 2 O: 10%

[0154] O 2 : 13%

[0155] SO 2 :100ppm

[0156] N 2 :margin

[0157] The NO conversion rate and the CO conversion rate are shown in Figure 3(a) and Figure 3(b), respectively.

[0158] As shown in Fig. 3(a), before the peak of the denitrification rate is reached, as the temperature rises, the denitrification rate increases in a steep curve. The CO is turned to denitrification in a relatively large ratio, and the combustion rati...

Embodiment 3

[0161] Example 3 (Comparative denitrification test with other exhaust gas denitrification catalysts)

[0162] Among the exhaust gas denitrification catalysts used in Example 2, a catalyst in which 0.5% by weight of iridium is supported on barium sulfate is used as the exhaust gas denitrification catalyst of the present invention. For the exhaust gas denitrification catalyst of the present invention, it contains CO at a high concentration of 4000 to 15000 ppm. For exhaust gas composed of the following gas, a denitrification test was performed. The exhaust gas temperature at the inlet of the catalyst was 180 to 300°C, and the test was performed with AV=10.3 [Nm / hr]. The comparative exhaust gas denitrification catalyst is Ir / TiO 2 (Iridium is supported on a titanium oxide support). The preparation method of the comparative exhaust gas denitrification catalyst is equivalent to the method for preparing the catalyst of the present invention. That is, except that the support is made ...

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Abstract

Provided is an exhaust gas treatment catalyst that is obtained by causing barium sulfate to carry 0.25-20.0% of iridium by weight and that is used for treating exhaust gas containing 4000-15000 ppm ofCO.

Description

Technical field [0001] The invention relates to an exhaust gas denitrification catalyst, a CO oxidation catalyst, an exhaust gas treatment system and an exhaust gas treatment method. Background technique [0002] Background technology of the first group of inventions [0003] As we all know, for the nitrogen oxides (NO X ) For denitrification treatment. [0004] In the denitrification treatment of exhaust gas, ammonia is added as a reducing agent for denitrification treatment. In addition, it is not necessary to add such a reducing agent, and it is also known in the prior art that CO originally contained in the exhaust gas is effectively used as a reducing agent (Patent Document 1). This is because there is no need to add ammonia as a reducing agent, and cost reduction can be achieved. [0005] Here, for example, the exhaust gas from a sintering furnace or the like contains CO at a particularly high concentration. [0006] As for the exhaust gas containing CO in a high concentration,...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01D53/86
CPCB01D53/865B01D2255/1028B01D2255/2042B01D2257/404B01D2257/502B01J23/58
Inventor 增田具承矶部知昭东野耕次
Owner MITSUBISHI HITACHIPOWER SYST LTD
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