Performance of [gamma]-Ga sub(2O) sub(3)-Al sub(2O) sub(3) solid solutions prepared by spray pyrolysis for CH sub(4-SCR of NO)

• Published in: Applied catalysis. A, General General, 2011-04, Vol.396 (1-2), p.140-147
• Main Authors: Watanabe, Tsunenori, Miki, Yoshihisa, Masuda, Takeo, Kanai, Hiroyoshi, Hosokawa, Saburo, Wada, Kenji, Inoue, Masashi
• Format: Article
• Language: English
• Subjects: Aluminum; Aqueous solutions; Metal nitrates; Methane; Ovens; Precursors; Selective catalytic reduction; Solid solutions; Spray pyrolysis
• ISSN: 0926-860X
• DOI: 10.1016/j.apcata.2011.02.005

Precursor particles for [gamma]-Ga sub(2O) sub(3)-Al sub(2O) sub(3) solid solutions were prepared by spray pyrolysis of aqueous solutions of mixtures of Ga(NO sub(3)) sub(3), Al(NO sub(3)) sub(3), and HNO sub(3, and the performance of the [gamma]-Ga) sub(2)O sub(3-Al) sub(2)O sub(3 solid solutions obtained by calcination thereof at 800 [deg]C was investigated for the selective catalytic reduction of NO with methane as a reducing agent. The precursor prepared with a temperature gradient from 200 to 700 [deg]C and with a total residence time of 23 s in the ovens had a high performance. The concentration of HNO) sub(3) or of metal nitrates affected the performance. The precursor prepared from Al(NO sub(3)) sub(3) or Al(acac) sub(3 as an aluminum source exhibited high performance; however, the precursor prepared from pseudoboehmite resulted in a lower activity.)