Promising Stability of Gold-Based Catalysts Prepared by Direct Anionic Exchange for DeNO x Applications in Lean Burn Conditions
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Supported gold catalysts on γ-Al2O3 have been investigated in the catalytic reduction of NO x 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
We would like to thank the CNRS which stimulates this research project through the International Associate Laboratory between UCCS and NCL with a Ph’D fellowship (D.L. Nguyen). We thank Arnaud Beaurain and A.S. Mamede who conducted XPS measurements.
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