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Method for detecting low concentration gas コモンズ

外国特許コード F120006741
掲載日 2012年5月31日
出願国 アメリカ合衆国
出願番号 59159909
公報番号 20100294020
公報番号 8365576
出願日 平成21年11月24日(2009.11.24)
公報発行日 平成22年11月25日(2010.11.25)
公報発行日 平成25年2月5日(2013.2.5)
優先権データ
  • 特願2009-124040 (2009.5.22) JP
発明の名称 (英語) Method for detecting low concentration gas コモンズ
発明の概要(英語) Disclosed is a method for detecting a low concentration gas.
In the method, a measurand gas containing the target gas in a concentration of 50 ppm or less is supplied to an oscillation element which contains a quartz crystal resonator and a zeolite including a metal complex (such as a zeolite including a cobalt phthalocyanine complex) present on or above the quartz crystal resonator.
The target gas is then detected through a change in resonance frequency of the quartz crystal resonator, the change being caused by the adsorption of the target gas by the metal-complex-including zeolite.
特許請求の範囲(英語) [claim1]
1. A method for detecting a low concentration gas contained in a measurand gas, the method comprising the steps of: supplying the measurand gas containing the target gas in a concentration of 50 ppm or less to an oscillation element, the oscillation element containing a quartz crystal resonator and a zeolite including a metal complex (hereinafter simply referred to as "metal-complex-including zeolite") present on or above the quartz crystal resonator, and
detecting the target gas through a change in resonance frequency of the quartz crystal resonator, the change caused by the adsorption of the target gas by the metal-complex-including zeolite,
wherein the zeolite is selected from the group consisting of zeolite X, zeolite Y, EMT, SAPO-37, and beryllophosphate X having an internal pore diameter of 1.3 nm and a pore opening diameter of 0.7 nm,
the metal complex is a metal phthalocyanine complex encapsulated in a unit cell of the zeolite, and
the metal-complex-including zeolite is just supported on an electrode of the quartz crystal resonator.
[claim2]
2. The method according to claim 1, wherein the oscillation element comprises a powder of the metal-complex-including zeolite supported on or above the quartz crystal resonator and contains substantially no binder.
[claim3]
3. The method according to claim 2, wherein the metal-complex-including zeolite is a zeolite X including a cobalt phthalocyanine complex encapsulated in a unit cell of the zeolite X.
[claim4]
4. A gas sensor for use in the method of claim 3, the gas sensor comprising: an oscillation element containing a quartz crystal resonator and a metal-complex-including zeolite present on or above the quartz crystal resonator;
a measurand gas supply unit that supplies the measurand gas to the oscillation element; and,
a frequency counter that determines the resonance frequency of the quartz crystal resonator.
[claim5]
5. A method for manufacturing an oscillation element for use in the method of claim 3, the manufacturing method comprising the steps of: preparing a powder of a zeolite including a metal complex, the metal complex having a size larger than that of the opening of a zeolite unit cell and being encapsulated in the zeolite unit cell;
placing the powder of metal-complex-including zeolite in a solvent and homogenizing the powder in the solvent through ultrasonic disintegration to give a suspension containing substantially no binder; and,
applying the suspension prepared through homogenization to a surface of an electrode of a quartz crystal resonator and drying the applied suspension.
[claim6]
6. A gas sensor for use in the method of claim 2, the gas sensor comprising: an oscillation element containing a quartz crystal resonator and a metal-complex-including zeolite present on or above the quartz crystal resonator;
a measurand gas supply unit that supplies the measurand gas to the oscillation element; and,
a frequency counter that determines the resonance frequency of the quartz crystal resonator.
[claim7]
7. A method for manufacturing an oscillation element for use in the method of claim 2, the manufacturing method comprising the steps of: preparing a powder of a zeolite including a metal complex, the metal complex having a size larger than that of the opening of a zeolite unit cell and being encapsulated in the zeolite unit cell;
placing the powder of metal-complex-including zeolite in a solvent and homogenizing the powder in the solvent through ultrasonic disintegration to give a suspension containing substantially no binder; and,
applying the suspension prepared through homogenization to a surface of an electrode of a quartz crystal resonator and drying the applied suspension.
[claim8]
8. The method according to claim 1, wherein the metal-complex-including zeolite is a zeolite X including a cobalt phthalocyanine complex encapsulated in a unit cell of the zeolite X.
[claim9]
9. A gas sensor for use in the method of claim 8, the gas sensor comprising: an oscillation element containing a quartz crystal resonator and a metal-complex-including zeolite present on or above the quartz crystal resonator;
a measurand gas supply unit that supplies the measurand gas to the oscillation element; and,
a frequency counter that determines the resonance frequency of the quartz crystal resonator.
[claim10]
10. A method for manufacturing an oscillation element for use in the method of claim 8, the manufacturing method comprising the steps of: preparing a powder of a zeolite including a metal complex, the metal complex having a size larger than that of the opening of a zeolite unit cell and being encapsulated in the zeolite unit cell;
placing the powder of metal-complex-including zeolite in a solvent and homogenizing the powder in the solvent through ultrasonic disintegration to give a suspension containing substantially no binder; and,
applying the suspension prepared through homogenization to a surface of an electrode of a quartz crystal resonator and drying the applied suspension.
[claim11]
11. A gas sensor for use in the method of claim 1, the gas sensor comprising: an oscillation element containing a quartz crystal resonator and a metal-complex-including zeolite present on or above the quartz crystal resonator;
a measurand gas supply unit that supplies the measurand gas to the oscillation element; and,
a frequency counter that determines the resonance frequency of the quartz crystal resonator.
[claim12]
12. A method for manufacturing an oscillation element for use in the method of claim 1, the manufacturing method comprising the steps of: preparing a powder of a zeolite including a metal complex, the metal complex having a size larger than that of the opening of a zeolite unit cell and being encapsulated in the zeolite unit cell;
placing the powder of metal-complex-including zeolite in a solvent and homogenizing the powder in the solvent through ultrasonic disintegration to give a suspension containing substantially no binder; and,
applying the suspension prepared through homogenization to a surface of an electrode of a quartz crystal resonator and drying the applied suspension.
[claim13]
13. The method according to claim 1, wherein the target gas is selected from the group consisting of toluene, pyridine, acetaldehyde, and xylene.
[claim14]
14. The method according to claim 13, wherein the metal-complex-including zeolite is a zeolite X including a cobalt phthalocyanine complex encapsulated in a unit cell of the zeolite X.
[claim15]
15. A gas sensor for use in the method of claim 13, the gas sensor comprising: an oscillation element containing a quartz crystal resonator and a metal-complex-including zeolite present on or above the quartz crystal resonator;
a measurand gas supply unit that supplies the measurand gas to the oscillation element; and,
a frequency counter that determines the resonance frequency of the quartz crystal resonator.
[claim16]
16. A method for manufacturing an oscillation element for use in the method of claim 13, the manufacturing method comprising the steps of: preparing a powder of a zeolite including a metal complex, the metal complex having a size larger than that of the opening of a zeolite unit cell and being encapsulated in the zeolite unit cell;
placing the powder of metal-complex-including zeolite in a solvent and homogenizing the powder in the solvent through ultrasonic disintegration to give a suspension containing substantially no binder; and,
applying the suspension prepared through homogenization to a surface of an electrode of a quartz crystal resonator and drying the applied suspension.
  • 発明者/出願人(英語)
  • MASUDA HIDEKI
  • INOMATA TOMOHIKO
  • SAWAKI TAKU
  • NAGOYA INSTITUTE OF TECHNOLOGY
国際特許分類(IPC)
米国特許分類/主・副
  • 73/24.06
  • 73/24.01
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