NOx abatement in the exhaust of lean-burn natural gas engines over Ag-supported gamma-Al2O3 catalysts

作者：Azizi Y; Kambolis A; Boreave A; Giroir Fendler A; Retailleau Mevel L; Guiot B; Marchand O; Walter M; Desse M L; Marchin L; Vernoux P^*

来源：Surface Science, 2016, 646: 186-193.

DOI：10.1016/j.susc.2015.10.020

• NOx reduction
• Lean-burn natural gas
• Gamma-alumina
• Silver
• Methane combustion

A series of Ag catalysts supported on gamma-Al2O3, including two different gamma-Al2O3 supports and various Ag loadings (2-8 wt.%), was prepared, characterized (SEM, TEM, BET, physisorption, TPR, NH3-TPD) and tested for the selective catalytic reduction of NOx by CH4 for lean-burn natural gas engines exhausts. The catalysts containing 2 wt.% Ag supported on gamma-Al2O3 were found to be most efficient for the NOx reduction into N-2 with a maximal conversion of 23% at 650 degrees C. This activity was clearly linked with the ability of the catalyst to concomitantly produce CO, via the methane steam reforming, and NO2. The presence of small AgOx nanoparticles seems to be crucial for the methane activation and NOx reduction.

• 出版日期2016-4