Performance of γ-Ga2O3-Al2O3 solid solutions prepared by spray pyrolysis for CH4-SCR of NO
Precursor particles for γ-Ga2O3-Al2O3 solid solutions were prepared by spray pyrolysis of aqueous solutions of mixtures of Ga(NO3)3, Al(NO3)3, and HNO3, and the performance of the γ-Ga2O3-Al2O3 solid solutions obtained by calcination thereof at 800 °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 °C and with a total residence time of 23 s in the ovens had a high performance. The concentration of HNO3 or of metal nitrates affected the performance. The precursor prepared from Al(NO3)3 or Al(acac)3 as an aluminum source exhibited high performance; however, the precursor prepared from pseudoboehmite resulted in a lower activity.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (119 K)Download as PowerPoint slideResearch highlights► Precursor particles for γ-Ga2O3-Al2O3 solid solutions were prepared by spray pyrolysis. ► An adequate temperature in ovens and residence time for the mists in spray pyrolysis were required. ► The concentration of HNO3 or of metal nitrates in the starting solution affected the performance.
Journal: Applied Catalysis A: General - Volume 396, Issues 1–2, 15 April 2011, Pages 140–147