Oxygen Radicals Occlusion/Release Behavior of Nanoporous Aluminosilicate, Ca₁₂Al_14-XSi_XO_33+0.5X (0≦X≦4)

Abstract:

Oxygen radicals occlusion / release behavior of nanoporous aluminosilicate, Ca12Al14-XSiXO33+0.5X (0≦X≦4), synthesized under different condition was examined by the temperature programmed reduction (TPR) in an atmosphere of hydrogen in the temperature range of 200-1000°C and temperature programmed oxidation (TPO) measurement at 800°C. From the TPR results of Ca12Al14O33 (X=0) and Ca12Al10Si4O35 (X=4), it was found that there were three oxygen release peaks, denoted as α, β and γ, on each sample and the peaks appeared in the temperature range 300-420°C, 420-600°C, and 600-750°C, respectively. The oxygen contents of α and γ of samples were almost the same. However, the oxygen content of β in the sample with x = 4 was much larger, almost double, compared to that in x = 0. From the TPR, TPO results and catalytic performance, it was concluded that the oxygen content of β peak strongly influenced the catalytic activity of the nanoporous aluminosilicate in the propylene combustion.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 2105-2109
• DOI: https://doi.org/10.4028/www.scientific.net/AST.45.2105
• Online since: October 2006
• Authors: Makoto Nagashima, Daisuke Hirabayashi, Kenzi Suzuki
• Keywords: Alumino-Silicate, Catalytic Activity, Nano-Porous Materials, Occlusion, Oxygen Radicals, Release

References

[1] H. Hosono and Y. Abe: Inorg. Chem., Vol. 26 (1987) p.1192.

[2] K. Hayashi, M. Hirano, S. Matsuishi and H. Hosono: J. Am. Chem. Soc., Vol. 124 (2002) p.738.

[3] S. Fujita, K. Suzuki, M. Ohkawa, T. Mori, Y. Iida, Y. Miwa, H. Masuda and S. Shimada: Chem. Mater., Vol. 15 (2003) p.255.

[4] S. Fujita, M. Ohkawa, K. Suzuki, H. Nakano, T. Mori and H. Masuda: Chem. Mater., Vol. 15, (2003) p.4879.

[5] K. Hayashi, M. Hirano and H. Hosono: Chem. Lett., Vol. 34 (2005) p.586.

[6] S. Fujita, K. Suzuki and T. Mori: Catal. Lett., Vol. 86 (2003) p.139.

[7] S. Fujita, K. Suzuki, T. Mori and H. Masuda: J. Eur. Ceram. Soc., Vol. 25 (2005) p.3479.

[8] K. Mochizuki, D. Hirabayashi, Y. Kojima and K. Suzuki: Mater. Trans., Vol. 46 (2005) p.2629.

[9] K. Sato, M. Yamaguchi, S. Fujita, K. Suzuki and T. Mori, Catal. Commun., Vol. 7 (2006) p.132.

[10] S. Fujita, H. Nakano, K. Suzuki, T. Mori and H. Masuda: Catal. Lett., Vol. 106 (2006) p.139.