Avaliação de catalisador mesoporoso na reação de hidrocraqueamento do cumeno.

Abstract

The reserves of petrol in the more external layers of oil are beginning to exhaust and, consequently, the finding of petrol in deeper layers will demand new techniques of extraction and refinement. For that reason, the refineries of petrol are processing increasingly heavier loads, due to changes in the composition of petrol. The growing severity of the new environmental laws has caused a great demand for de development of new hydrorefinement catalyzers (HDR), specially the catalytic hydrocracking ones with a performance superior than the ones employed up to now. The development of new HDR catalyzers demands the analysis of new active phases, new promoters or supports. The M41S family and other mesoporous sieves have a wide superficial area (»1000 m2/g) and pore volume (» 1,0 cm3/g), which gives new possibilities to obtain catalyzers that have a high dispersion capacity of the MoO3 in MCM-41, when compared to the zeolites of the kind NaZSM-5 and NaY. The MCM-41 was synthesized using low concentrations of surfactant at the room temperature, which makes this methodology simple and economically interesting. As a result, the support (MCM-41) was regularly obtained at the temperature of 500°C for 4 hours. The impregnations with nickel promoted a reduction in the intensity of the characteristic peaks by DRX. However, by the technique of MET, one can observe the uniform distribution of the MCM-41 channels. By the analysis of the area and pore volume definition, an area of support superior to the one observed in the literature was observed. After the impregnations, the lowering of area and volume in function of the metal percentage used was observed. The catalyzers under investigation showed stability in the cumene hydrocracking reaction during seven hours of reaction. In the used operational conditions, the results of catalytic activity presented by the catalyzers MCM-41 Ni1Mo10 and MCM-41 Ni2Mo10 were superior when compared to the one catalyzer used as a reference. The activity and conversion decreased with the raising of the impregnated metal percentage. The reference catalyzer presented selectivity to HID.