Improving of cold-start and combustion emissions in lean NO conditions with active and selective AgAl mesoporous catalysts

Mesoporous AgAl-MCM41 catalytic adsorbents were synthesized. Template-ion exchange (tie) and incipient wet impregnation (iwi) methods were employed to incorporate Ag. The presence of non-structural and structural Ag(I) ionic species were detected. As the former refers to the ions that occupy an active site, the latter are part of the support hexagonal network. In addition, Ag2O nanoparticles were observed.