Role of A- and B-cations in catalytic property of substituted hexaaluminate (ABAl{sub 11}O{sub 19-{alpha}}) for high temperature combustion
- Kyushu Univ., Fukuoka (Japan)
Cation-substituted hexaaluminate compounds, ABAl{sub 11}O{sub 19-{alpha}}, were investigated for application to high temperature catalytic combustion. Two series of modifications of the compounds was made by cation substitution; substitution of large cations in the mirror plane with lanthanides ions, and substitution of transition metals for Al site in the spinel block. In a series of AMnAl{sub 11}O{sub 19-{alpha}} (A = La, Pr, Sm, and Nd), surface area and catalytic activity increased with an increase in ionic radius of lanthanides. La{sup 3+} is superior as the large cation in the mirror plane of the hexaaluminate to other tri-valent cations with small ionic radii. The catalytic activities of LaBAl{sub 11}O{sub 19-{alpha}}, (B = Cr, Mn, Fe, Co, Ni, and Cu) were enhanced when Mn and Cu were employed as the B-site substituents. Although Mn and Cu were also effective substituents for enhancing catalytic activity in Ba-based hexaaluminate compounds, their activity was low as compared with the La-based catalysts. These results indicate that the redox cycle of transition metal in hexaaluminate lattice and catalytic activity appears to be affected sensitively with the electronic or structural effect of large cation in the mirror plane.
- OSTI ID:
- 467982
- Report Number(s):
- CONF-960652-; TRN: 96:004817-0019
- Resource Relation:
- Conference: 11. international congress on catalysis (ICC-11), Baltimore, MD (United States), 30 Jun - 5 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of 11th International congress on catalysis - 40th anniversary. Part A and B; Hightower, J.W.; Delgass, W.N.; Iglesia, E.; Bell, A.T. [eds.]; PB: 1482 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic properties of Pd-supported hexaaluminate catalysts for high-temperature catalytic combustion
Catalytic properties of BaMAl sub 11 O sub 19-. alpha. (M = Cr, Mn, Fe, Co, and Ni) for high-temperature catalytic combustion