| Summary: | ABSTRACT
Catalytic hydrocracking of waste lubricant oil into liquid fuel fraction using ZnO, Nb2050activated natural zeolite
(ZAAH) and their modification has been investigated.The zeolite was produced in Wonosari, Yogyakarta.Activation
of the zeolite was carried out by refluxing with HCI 3M for 30 min, produced the activated natural zeolite (ZAAH). The
ZnO/ZAAH catalyst was prepared by impregnation of Zn onto the ZAAH by ion exchange method using salt
precursor of Zn(N03h 4H20. The Nb20slZAAHcatalyst was prepared by mixing the ZAAH sample with Nb20s and
oxalic acid solution until the paste was formed. The impregnation of Zn onto Nb20slZAAH was carried out using the
same method to that of the ZnO/ZAAH catalyst, resulted ZnOINb20s-ZAAHcatalyst. Characterization of catalyst
include determination of Zn metal by Atomic Absorption Spectroscopy (AAS), acidity by gravimetric method and
catalyst porosity by Surface Area Analyzer (NOVA-1000).Catalytic hydrocracking was carried out in a semi-batch
reactor system using ZnO, ZAAH, ZnO/ZAAH and ZnOINb20s-ZAAH catalysts at 450°C under the H2flow rate
of 15 mUmin. and the ratio of catalyst/feed = 1/5. The composition of liquid products was analyzed by Gas
Chromatograpy (GC).The results showed that impregnation of ZnO and/or Nb20son the ZAAH increased the acidity
and specific surface area of catalyst. The products of the hydrocracking process were liquid, coke and gas.
Conversion of liquid products was increased by the increase of catalyst acidity. The highest liquid product was
produced by ZnOINb20s-ZAAHcatalyst, 52.97 wt-%,consistof gasoline,38.87 wt-% and diesel, 14.10 wt-%.
Keywords: hydrocracking, waste lubricant oil, liquid fuel fraction
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