Metal oxide, oxygen adsorption and desorption device, oxygen concentrating device, and method for producing metal oxide
AssigneesMitsubishi Chemical Corporation, Kanagawa University
InventorsRyo NISHIDA, Keiji YAMAHARA, Teruki MOTOHASHI, Miwa SAITO, Sayaka TAMURA, Tomohiro ISEKI
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Abstract
Provided is a metal oxide containing a brownmillerite-type manganese oxide represented by (Ca2-xAx)(MnyAlzE2-y-z)wO5+δ (in the formula, A represents one or more alkaline earth metal elements other than Ca; E represents one or more 3d transition metal elements or earth metal elements other than Mn and Al; and x, y, z, δ, and w satisfy 0≤x≤2, 0<y≤2, 0≤z<2, 0<y+z≤2, 0≤δ≤0.5, and 0.8≤w≤1.2), wherein the metal oxide has a defect in a (020) plane of a crystal of the brownmillerite-type manganese oxide.
Claims11
A metal oxide, comprising a brownmillerite-type manganese oxide represented by the following Formula (1),
- wherein the metal oxide has a defect in a (020) plane of a crystal of the brownmillerite-type manganese oxide:
- (Ca2-xAx)(MnyAlzE2-y-z)wO5+δ (1)
- where, in the Formula (1),
- A represents one or more alkaline earth metal elements other than Ca;
- E represents one or more 3d transition metal elements or earth metal elements other than Mn and Al;
- and
- x, y, z, δ, and w satisfy 0≤x≤2, 0<y≤2, 0≤z<2, 0<y+z≤2, 0≤δ≤0.5, and 0.8≤w≤1.2.
A metal oxide, comprising a brownmillerite-type manganese oxide represented by the following Formula (1),
- wherein a phase transition temperature of oxygen adsorption and desorption in an air stream is 530° C. or lower:
- (Ca2-xAx)(MnyAlzE2-y-z)wO5+δ (1)
- where, in the Formula (1),
- A represents one or more alkaline earth metal elements other than Ca;
- E represents one or more 3d transition metal elements or earth metal elements other than Mn and Al;
- and
- x, y, z, δ, and w satisfy 0≤x≤2, 0<y≤2, 0≤z<2, 0<y+z≤2, 0≤δ≤0.5, and 0.8≤w≤1.2.
A method of producing a metal oxide, the method comprising a heating step of heating a brownmillerite-type manganese oxide represented by the following Formula (1) in an atmosphere having an oxygen partial pressure of 0.1 kPa or higher and lower than 20.9 kPa:
- (Ca2-xAx)(MnγAlzE2-γ-z)wO5+δ (1)
- where in the Formula (1),
- A represents one or more alkaline earth metal elements other than Ca;
- E represents one or more 3d transition metal elements or earth metal elements other than Mn and Al;
- and
- x, y, z, δ, and w satisfy 0≤x≤2, 0<y<2, 0≤z<2, 0<y+z≤2, 0≤δ≤0.5, and 0.8≤w≤1.2.
Dependencies are inferred from the claim text.