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Selective CO methanation catalyst, method of producing the same, and apparatus using the same

外国特許コード F120006902
整理番号 P09-016US
掲載日 2012年10月4日
出願国 アメリカ合衆国
出願番号 201113278990
公報番号 20120063963
公報番号 9005552
出願日 平成23年10月21日(2011.10.21)
公報発行日 平成24年3月15日(2012.3.15)
公報発行日 平成27年4月14日(2015.4.14)
優先権データ
  • 特願2009-106938 (2009.4.24) JP
  • 2010WO-JP54279 (2010.3.9) WO
発明の名称 (英語) Selective CO methanation catalyst, method of producing the same, and apparatus using the same
発明の概要(英語) (US9005552)
Provided is a new catalyst capable of removing carbon monoxide economically without adding particular reaction gas externally.
Also provided are a process for producing and an apparatus using such a catalyst.
Impregnation of a Ni―Al composite oxide precursor of a nonstoichiometric composition prepared by the solution-spray plasma technique with a ruthenium salt to be supported and performing reduction treatment allows CO methanation reaction to selectively proceed even in the high-temperature range in which CO2 methanation reaction and reverse water-gas-shift reaction proceed preferentially with conventional catalysts.
Selective CO methanation reaction occurs reproducibly with another Ni―Al composite oxide precursor or an additive metallic species.
Also, the low-temperature activity of CO methanation reaction can be improved through steps different from conventional catalyst production processes in producing such a catalyst material, whereby the temperature window the resulting catalyst material has can be utilized most effectively.
特許請求の範囲(英語) [claim1]
1. A method of producing a selective CO methanation catalyst comprising the steps of: preparing a composite oxide precursor containing at least nickel and aluminum of a nonstoichiometric and substantially uniform composition; and
heating the precursor at a temperature of 200 to 700 degrees C. under a reductive gas atmosphere to cause metal nickel particles to disperse from the precursor, and to appear and be supported on a surface thereof,
wherein the step of preparing a composite oxide precursor comprises the step of heat-treating fine droplets of metal salt solution containing at least nickel and aluminum under atmospheric plasma or low-pressure plasma.
[claim2]
2. The method of producing a selective CO methanation catalyst according to claim 1, further comprising the step of shaping catalyst powder with the metal nickel particles dispersing thereon into grains or a plate or coating onto a honeycomb substrate.
[claim3]
3. The method of producing a selective CO methanation catalyst according to claim 1 further comprising the step of impregnating the composite oxide precursor with raw material salt solution of a metal having an oxide reductive capacity or adding the precursor with the metal prior to the step of heating the precursor under a reductive gas atmosphere.
[claim4]
4. A method of producing a selective CO methanation catalyst comprising the steps of: preparing a composite oxide precursor containing at least nickel and aluminum of a nonstoichiometric and substantially uniform composition; and
heating the precursor at a temperature of 200 to 700 degrees C. under a reductive gas atmosphere to cause metal nickel particles to disperse from the precursor, and to appear and be supported on a surface thereof,
wherein the step of preparing a composite oxide precursor comprises a sol-gel step for forming a mesoporous material.
[claim5]
5. The method of producing a selective CO methanation catalyst according to claim 4, further comprising the step of shaping catalyst powder with the metal nickel particles dispersing thereon into grains or a plate or coating onto a honeycomb substrate.
[claim6]
6. The method of producing a selective CO methanation catalyst according to claim 4, further comprising the step of impregnating the composite oxide precursor with raw material salt solution of a metal having an oxide reductive capacity or adding the precursor with the metal prior to the step of heating the precursor under a reductive gas atmosphere.
[claim7]
7. A method of producing a selective CO methanation catalyst comprising the steps of: preparing a composite oxide precursor containing at least nickel and aluminum of a nonstoichiometric and substantially uniform composition;
heating the precursor at a temperature of 200 to 700 degrees C. under a reductive gas atmosphere to cause metal nickel particles to disperse from the precursor, and to appear and be supported on a surface thereof; and
impregnating the composite oxide precursor with raw material salt solution of a metal having an oxide reductive capacity or adding the precursor with the metal prior to the step of heating the precursor under a reductive gas atmosphere.
[claim8]
8. The method of producing a selective CO methanation catalyst according to claim 7, wherein the metal which can promote reduction of oxide includes one or two or more selected from the group consisting of ruthenium, platinum, palladium, rhodium, iridium, and osmium.
[claim9]
9. The method of producing a selective CO methanation catalyst according to claim 7, further comprising the step of shaping catalyst powder with the metal nickel particles dispersing thereon into grains or a plate or coating onto a honeycomb substrate.
  • 発明者/出願人(英語)
  • WATANABE MASAHIRO
  • YAMASHITA HISAO
  • HIGASHIYAMA KAZUTOSHI
  • MIYAO TOSHIHIRO
  • CHEN AIHUA
  • UNIVERSITY OF YAMANASHI
国際特許分類(IPC)
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