کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
157677 | 456980 | 2010 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: NO SCR reduction by hydrogen generated in line on perovskite-type catalysts for automotive diesel exhaust gas treatment NO SCR reduction by hydrogen generated in line on perovskite-type catalysts for automotive diesel exhaust gas treatment](/preview/png/157677.png)
This paper deals with the preparation (by solution combustion synthesis, SCS), characterization (by XRD, BET, FESEM and TPD/R analyses), catalytic activity evaluation (in a temperature-programmed reaction—TPRe apparatus), and the assessment of the reaction mechanism of NO reduction by H2 in the presence of oxygen on a series of perovskite-type catalysts belonging to the LaFeO3 family (LaFeO3, La0.8Sr0.2FeO3, Pd/La0.8Sr0.2FeO3, La0.8Sr0.2Fe0.9Pd0.1O3, La0.7Sr0.2Ce0.1FeO3, Pd/La0.7Sr0.2Ce0.1FeO3, La0.7Sr0.2Ce0.1Fe0.9Pd0.1O3). The catalysts have been studied in the 25–350 °C temperature range. Significant catalytic activities were measured at 150–250 °C. Among the catalysts screened, La0.8Sr0.2Fe0.9Pd0.1O3, showed the best performance. Hence, it was deposited directly over a ceramic honeycomb monolith by in situ SCS and then tested in a lab-scale test rig. A mechanistic analysis is presented concerning the relationship between the observed activity and the reducibility of the B site, determined from TPR experiments, as well as the correlation between the observed oxygen inhibition and the proposed NOx reduction mechanism.Some final conclusions are drawn on the perspective of the practical application of the investigated after-treatment route for diesel exhaust gases.
Journal: Chemical Engineering Science - Volume 65, Issue 1, 1 January 2010, Pages 120–127