| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 39459 | Applied Catalysis A: General | 2014 | 10 Pages |
•LaBO3 (B = Co, Mn, Fe) perovskites were used as oxidation promoters in FCC catalysts.•LCoO oxidizes the highest and LMnO the lowest fraction of the feed during cracking.•LFeO exhibits the highest and LMnO the lowest coke formation tendencies.•The perovskites decrease the conversion and increase deactivation of the catalysts.•The perovskites significantly lower CO evolution in coked catalysts regeneration.
The effects of LaBO3 (B = Co, Mn, Fe) perovskites physically mixed with HY-zeolite (Y), denoted as LBO-Y binary catalysts, on both cumene cracking and the catalysts regeneration were studied. All the catalysts exhibit more than 82% cumene conversion and their activities decrease in the order of Y-zeolite > LCoO-Y > LFeO-Y > LMnO-Y. During cumene cracking, the perovskites are reduced leading to increase in dehydrogenation coking and oxidation of a portion of the carbon content of the feed into carbon oxides. As compared to the Y-zeolite with no promoter, a decline of about 8.3% and increase of around 75.0 and 83.3% in coke formation are observed for LMnO-Y, LCoO-Y and LFeO-Y, respectively. Furthermore, the addition of LCoO, LFeO and LMnO to the Y-zeolite lowers the ratio of CO evolution per deposited carbon in the coked catalysts regeneration by about 91, 48 and 34%, respectively. Finally, among the screened perovskites, LMnO exhibits both the lowest coke formation tendency and a considerable CO oxidation activity, thus it is a potential additive to fluid catalytic cracking catalysts.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (306 K)Download as PowerPoint slide
