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Catalyst for reducing mercury, a mercury conversion unit, and an apparatus for measuring total mercury in combustion exhaust gas by using the same

a technology of conversion unit and catalyst, which is applied in the direction of colloidal chemistry, instruments, separation processes, etc., can solve the problems of hardly feasible with the conventional apparatus for measuring total mercury, continuous measurement with catalyst performance maintained without, etc., and achieves high reducing function, high accuracy and stability. , the effect of high reducing function

Inactive Publication Date: 2011-03-17
AKIYAMA SHIGEYUKI +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a catalyst for reducing mercury in exhaust gas. The catalyst has a selectivity for mercury and is not affected by other components in the gas. It also has the ability to resist corrosion from strong acidic gases. The catalyst is made by mixing a reagent with a different salt as a crystallization inhibitor. The reagent is supported by a basic binder with an inorganic porous particle material as a carrier of the catalyst. This results in a catalyst that can maintain its efficiency even in the presence of water and other substances in the gas. The invention provides a solution for reducing mercury in exhaust gas with high efficiency.

Problems solved by technology

As described above, when various metal oxides or strongly acidic corrosive gases such as in coal combustion exhaust gas are coexistent, continuous measurement with catalyst performance maintained without undergoing the influence of coexisting components is hardly feasible with the conventional apparatus for measuring total mercury.

Method used

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  • Catalyst for reducing mercury, a mercury conversion unit, and an apparatus for measuring total mercury in combustion exhaust gas by using the same
  • Catalyst for reducing mercury, a mercury conversion unit, and an apparatus for measuring total mercury in combustion exhaust gas by using the same
  • Catalyst for reducing mercury, a mercury conversion unit, and an apparatus for measuring total mercury in combustion exhaust gas by using the same

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Embodiment Construction

[0043]Hereinafter, embodiments of the present invention are described in more detail by reference to the Drawings.

[0044]

[0045]The fundamental constitution of the mercury reduction catalyst according to the present invention is that the reagent of the present invention (corresponding to “a reagent comprising any of the sulfites of potassium, sodium, calcium and magnesium, or any of the phosphates thereof, or a combination of them”) is contained as a main reagent of the catalyst component. That is, the reagent of the present invention exerts reducing action selectively on a mercury compound (bifunctional) to covert it into element mercury, by utilizing the unique characteristics: (A) selectivity of reducing catalyst action for a mercury compound (bifunctional) and (B) unreactivity with coexisting acidic substances. The reagent of the present invention is poor in (C) reactivity with acidic substance such as SO2 and NO2, to eliminate the poisoning action thereof on the catalyst (poisoni...

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Abstract

The present invention relates to a catalyst for reducing mercury, which comprises a reagent comprising any of the sulfites of potassium, sodium, calcium and magnesium, or any of the phosphates thereof, or a combination of them, as a main reagent of a catalyst component. And the present invention relates to the catalyst for reducing mercury, wherein the catalyst component is mixed with a different salt as an agent for inhibiting crystallization of the catalyst component.

Description

RELATED APPLICATIONS[0001]This is a divisional application of U.S. Ser. No. 11 / 724,540, filed on Mar. 15, 2007, which claims priority from Japanese Application No. 2006-097630 filed Mar. 31, 2006.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a catalyst for reducing mercury, a mercury conversion unit and an apparatus for measuring total mercury in exhaust gas by using the same, and relates in particular to a catalyst for reducing mercury, a mercury conversion unit and an apparatus for measuring total mercury in exhaust gas by using the same, wherein total mercury in coal combustion exhaust gas for example is measured.[0004]2. Description of the Related Art[0005]As an apparatus for measuring total metal mercury in combustion exhaust gas, there has been conventionally used an apparatus for measuring total mercury for a fixed source by using a continuous measurement method or a dilution measurement method of using a gold amalgam catchin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/64C01B32/60
CPCG01N21/33Y10S95/90Y10S95/901G01N21/74
Inventor AKIYAMA, SHIGEYUKIKATO, JUNJIKOGA, FUJIOISHIKAWA, KOJI
Owner AKIYAMA SHIGEYUKI
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