Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9610537 | Catalysis Today | 2005 | 11 Pages |
Abstract
Our recent research works on the selective catalytic reduction (SCR) of diesel engine NOx by hydrocarbons over alumina-supported silver (Ag/Al2O3) were reviewed. The reaction mechanism of the SCR of NOx by C2H5OH over Ag/Al2O3 was studied using in situ DRIFTS and DFT calculations. A novel enolic species originating from the partial oxidation of C2H5OH and C3H6, was found on the surface of Ag/Al2O3 during the SCR of NOx by in situ DRIFTS, which was also supported by DFT calculations. Based on this, a mechanism of the NOx reduction was proposed, which can successfully explain the high efficiency of the NOx reduction by C2H5OH over Ag/Al2O3. A palladium promoted Ag/Al2O3 catalyst (denoted Ag-Pd/Al2O3) was developed for the SCR of NOx by C3H6. The Ag-Pd/Al2O3 showed a higher NOx conversion than Ag/Al2O3, especially at temperatures ranging from 300 to 450 °C. The engine bench tests showed that the average NOx conversion was greater than 80% in the diesel engine exhaust temperature range of 300-400 °C using our catalytic converter with C2H5OH as reductant, which represents a leap from the Euro II standard to the Euro III standard for NOx emission control in diesel engines.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Hong He, Yunbo Yu,