کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1487154 | 1510694 | 2016 | 8 صفحه PDF | دانلود رایگان |
• A-site defective perovskites increases the oxidation state of the B-cation.
• Not always non-stoichiometric perovskites exhibit higher catalytic activity in soot combustion.
• The highly symmetric cubic crystalline structure diminishes the redox properties of perovskites.
The influence of lanthanum stoichiometry in Ag-doped (La1-xAgxMn0.9Co0.1O3) and A-site deficient (La1-xMn0.9Co0.1O3-δ) perovskites with x equal to 10, 20 and 30 at.% has been investigated in catalysts for soot combustion. The catalysts were prepared by the amorphous citrate method and characterized by XRD, nitrogen adsorption, XPS, O2-TPD and TPR. The formation of a rhombohedral excess-oxygen perovskite for Ag-doped and a cubic perovskite structure for an A-site deficient series is confirmed. The efficient catalytic performance of the larger Ag-doped perovskite structure is attributed to the rhombohedral crystalline structure, Ag2O segregated phases and the redox pair Mn4+/Mn3+. A poor catalytic activity for soot combustion was observed with A-site deficient perovskites, despite the increase in the redox pair Mn4+/Mn3+, which is attributed to the cubic crystalline structure.
Figure optionsDownload as PowerPoint slide
Journal: Materials Research Bulletin - Volume 81, September 2016, Pages 134–141