新規酸素貯蔵物質としてのアルミノケイ酸カルシウム

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The total amount of superoxide (O_2^-) and peroxide (O_2^<2->) occluded in micropores of calcium aluminosilicate (Ca_<12>Al_<10>Si_4O_<35>; mayenite) was determined from their reaction with pulsed H_2. Mayenite was prepared by calcining precursor hydrogarnet, which was synthesized via hydrothermal reaction of a stoichiometric mixture of CaO, Al_2O_3, and amorphous SiO_2. Since a part of Ca^<2+> in hydrogarnet could be substituted with other metal ions by adding a corresponding metal nitrate to the mixture, metal-substituted mayenite was also prepared by calcining the precursor metal-substituted hydrogarnet. Substitution of Ca^<2+> with other metal ions markedly increased the amount of oxide anions reacting with pulsed H_2 and the amount was largest for Cu-mayenite. The amount of O_2 taken up in oxide anion-deficient mayenite was found to be largest for Cu-substituted mayenite. It was also confirmed that reaction between oxide anions in Cu-mayenite and pulsed H_2 and that between oxide anion-deficient Cu-mayenite and pulsed O_2 were completed even under a very high flow rate of the carrier gas, corresponding to the space velocity of >10^5h^<-1>. A large amount of occluded oxide anions reacting with H_2 together with their quick regeneration in oxide anion-deficient mayenite leads us to expect that Cu-mayenite is applied as a new material with an excellent oxygen storage capacity to an automotive three-way catalyst.
社団法人日本セラミックス協会の論文
2007-06-01

新規酸素貯蔵物質としてのアルミノケイ酸カルシウム

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