PEMBUATAN, KARAKTERISASI DAN UJI AKTIVITAS KATALIS NiMo/Z DAN NiMo/Z-Nb2O5 PADA REAKSI HIDRORENGKAH FRAKSI SAMPAH PLASTIK MENJADI FRAKSI BENSIN

Abstract

Activity test of NiMo/active natural zeolite (Z) and NiMo/Z-Nb2O5 catalysts for hydrocracking of waste plastic fraction polyprophylene (PP) type were done. Catalysts were prepared by impregnation method, then were calcined at 500oC, oxidized and reduced at 400oC under nitrogen, oxygen and hydrogen stream, respectively. The characterization of catalysts including spesific surface area, average pore radius, and total pore volume were determined by gas sorption analyzer, amount of total acid sites was determined by gas sorption method, and acid site strength was confirmed by IR sepectroscopy. The hydrocracking process was carried out in a semi-flow reactor system at 360oC and catalyst/feed ratio 0.5 under hydrogen stream (150 mL/hour). The feed was vaporized from the pyrolisis reactor into the hydrocracking reactor. A liquid product was collected and analyzed by gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS). The characterization results showed that spesific surface area, average pore radius, and total pore volume of the Z sample decreased after loading of the metal and Nb2O5. Amount of total acid sites of the catalysts were higher than that of the Z sample. The activity of catalysts followed the order of NiMo/Z>NiMo/Z-Nb2O5>Z (conversion of hydrocarbon C>12) and NiMoZ>NiMo/Z-Nb2O5>Z (total yield gasoline fraction). The selectivity of catalysts for C7-C8 product followed the order of NiMo/Z-Nb2O5>Z>NiMo/Z. Loading of Nb2O5 significantly affected the selectivity of C7-C8 product.

Keywords: activity, polyprophylene, catalyst, gasoline fraction