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Nitrogen oxide decomposing element and nitrogen oxide decomposing apparatus including the same

A technology for nitrogen oxides and decomposition components, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of difficult to deal with unreacted ammonia treatment, undesired use of ammonia, etc.

Inactive Publication Date: 2008-01-16
町田 正人 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the method proposed in Patent Document 1 has the following problems: the use of ammonia is undesirable for the environment and human beings, and the treatment must be performed at a high temperature of 400°C, and it is difficult to perform corresponding treatment according to changes in the concentration of nitrogen oxides , Need to deal with unreacted ammonia
The method in Patent Document 2 also has the following problem: when desorbing the adsorbed nitrogen oxides to regenerate the adsorbent, it must be treated at a high temperature of 300-400°C

Method used

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  • Nitrogen oxide decomposing element and nitrogen oxide decomposing apparatus including the same
  • Nitrogen oxide decomposing element and nitrogen oxide decomposing apparatus including the same
  • Nitrogen oxide decomposing element and nitrogen oxide decomposing apparatus including the same

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Embodiment approach 1

[0020] FIG. 1 is a schematic diagram showing the structures of a nitrogen oxide decomposing element and a nitrogen oxide decomposing device according to Embodiment 1 of the present invention.

[0021] The nitrogen oxide decomposing device according to Embodiment 1 includes a nitrogen oxide decomposing element 1 and a frame 7 in which the element is placed. The nitrogen oxide decomposing element 1 includes a conductive solid electrolyte membrane 2 selectively permeating hydrogen ions, an electronically conductive substrate disposed on a part of the surface of the solid electrolyte membrane 2, and a catalyst (hereinafter referred to as anode catalyst), a second electrode layer 4 consisting of an electronically conductive substrate and a cathode reduction-promoting catalyst (hereinafter referred to as cathode catalyst) arranged on other parts of the surface of the solid electrolyte membrane 2, And the platinum group catalyst 6 supported on the porous metal oxide 5 disposed adjace...

Embodiment approach 2

[0052] The nitrogen oxide decomposing element in Embodiment 2 is formed by bonding and disposing the following mixed layer between the solid electrolyte membrane 2 and the second electrode layer 4 of the nitrogen oxide decomposing element 1 (see FIG. 1 ) in Embodiment 1. element, the mixed layer includes an electronically conductive substrate, a solid electrolyte membrane, a platinum group catalyst, and a cathode catalyst (not shown). The mixed layer can be formed by dispersing a platinum group catalyst, a cathode catalyst, a micronized electronically conductive substrate and a micronized solid electrolyte membrane in a solution, heating and vaporizing their volatile components, and combining the particle components with each other.

[0053] Since the electrochemical reaction described in Embodiment Mode 1 occurs at the interface of each electrode and the solid electrolyte membrane, the reaction amount and reaction speed are proportional to the interface area. In Embodiment 2,...

Embodiment approach 3

[0055] FIG. 6 is a schematic diagram showing a nitrogen oxide decomposition device of Embodiment 3. FIG. In this figure, since the same components are assigned the same reference numerals, their descriptions are omitted. The nitrogen oxide decomposition device in the present embodiment has a nitrogen oxide detector 14 and a power source control device 15, and the detector 14 detects the concentration of nitrogen oxides; The magnitude of the current flowing between the first electrode layer 3 and the second electrode layer 4 and the energization time are controlled by the concentration of the oxide. With this structure, the magnitude and energization time of the current flowing through the nitrogen oxide decomposing element 1 can be controlled according to the concentration of nitrogen oxides. In addition, the nitrogen oxide detector 14 is preferably installed near the platinum group catalyst 6 supported on the metal oxide 5 on the cathode side. For example, a nitrogen oxide ...

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Abstract

A nitrogen oxide decomposing element and a nitrogen oxide decomposing apparatus can perform a treatment at a relatively low temperature without using a material, which is suspected to have influence on the environment and human body, as an oxidant or a catalyst. There is proposed a nitrogen oxide decomposing element 1 including a conductive solid electrolyte film 2 for selectively allowing a hydrogen ion to pass through, a first electrode layer 3 made of an electronic conductivity base material and a catalyst for accelerating anodic oxidation, a second electrode layer 4 made of an electronic conductivity base material and a catalyst for accelerating cathodic reduction, and a platinum group catalyst 6 supported by a porous metal oxide 5 disposed to be adjacent to the second electrode layer 4. A low-power consumption nitrogen oxide decomposing apparatus which can efficiently use electric energy is obtained by locating a nitrogen oxide sensor 14 in the vicinity of the platinum group catalyst 6 supported by the metal oxide 5, and controlling the magnitude of a current flowing between the first and the second electrode layers 3 and 4 and the energization time by a power source / control device 15 in accordance with the concentration of nitrogen oxide detected by the nitrogen oxide sensor 14.

Description

technical field [0001] The present invention relates to a nitrogen oxide decomposition element for decomposing and removing nitrogen oxide and a nitrogen oxide decomposition device having the element. Background technique [0002] The nitrogen oxide purification system that decomposes and removes nitrogen oxides is widely used in various fields: for example, automobile exhaust treatment, distributed combined heat and power systems, air purification in closed spaces such as long-distance tunnels and factories, etc., the future demand for them The quantity is also very impressive. A general technique for removing nitrogen oxides is disclosed in, for example, Japanese Patent Laid-Open Publication No. 2002-153755 (Patent Document 1). This patent document 1 discloses using ammonia as a reducing agent to purify nitrogen oxides NO x Methods. In the method disclosed above, the ammonia molecule (NH 3 Molecule) provides an electron to nitric oxide (NO) adsorbed on the noble metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/94B01D53/22B01D53/32B01D53/56
CPCB01D53/326B01D53/56
Inventor 町田正人山内四郎木村秀山地茂
Owner 町田 正人