Promising Stability of Gold-Based Catalysts Prepared by Direct Anionic Exchange for DeNOx Applications in Lean Burn Conditions
Supported gold catalysts on γ-Al2O3 have been investigated in the catalytic reduction of NOx in simulated Diesel exhaust gas conditions. Different parameters have been examined essentially the mode of gold incorporation via classical deposition–precipitation and anionic exchange methods and the nature of the pre-activation thermal treatment. The resistance to thermal ageing under reactive conditions at 500 °C was found completely different with a significant rate enhancement on anionic-exchange samples. Further comparisons also show that the nature of the pre-activation thermal treatment influences the extent of surface reconstructions during thermal ageing with a detrimental effect of reductive pre-treatment on the catalytic performances.
KeywordsAu/Al2O3 catalyst Anionic-exchange Deposition–precipitation NOx abatement Selective catalytic reduction
- 21.Parvulescu VI, Cojocaru B, Parvulescu V, Richards R, Li Z, Cadigan C, Granger P, Miquel P, Hardacre C (2010) J Catal 272:92–100Google Scholar