Abstract
The precursor particles for γ-Ga2O3–Al2O3 solid solutions were prepared by the coprecipitation method from aqueous solutions of Ga(NO3)3 and Al(NO3)3 with (NH4)2CO3 as a precipitant. The γ-Ga2O3–Al2O3 solid solutions were obtained by calcination of the precursor at 700 °C. In this paper, the performance of the catalysts treated with NH3 was investigated for the selective catalytic reduction (SCR) of NO with methane as a reducing agent, and it was found that γ-Ga2O3–Al2O3 catalysts treated with NH3 and subsequently annealed in air showed higher activities than the γ-Ga2O3–Al2O3 catalysts without NH3 treatment. NH3 treatment of the catalyst caused partial rearrangement of Ga3+ and Al3+ ions and increased the population of tetrahedral Ga3+ ions in the defective spinel structure. The activity of the γ-Ga2O3–Al2O3 catalysts for the selective catalytic reduction of NO with methane was improved by the NH3 treatment followed by annealing in air. This treatment caused an increase in the proportion of tetrahedrally-coordinated Ga3+ ions in the catalyst.
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