Cumene cracking activity and enhanced regeneration of FCC catalysts comprising HY-zeolite and LaBO3 (B = Co, Mn, and Fe) perovskites

• 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.

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