| Summary: | , Mordenite Preparation of γ-Al2O3 , and activated natural zeolite catalysts
supported by nickel for hydrocracking of polyethylene has been carried out. This
study was begun by activation of natural zeolite (ZA) from Sukabumi by
treatment of HCl 6 N for 30 min, followed by immersion with NH4Cl 1 N for a
week, produced activated natural zeolite (ZAA). The catalysts were prepared by
loading nickel metal onto γ-Al2O3, Mordenite, and ZAA using the precursor of
Ni(NO3)2·6H2O by wet impregnation method, followed by calcination with
microwave at 450 watt for 30 min, and reduction by H2 gas at 400 °C for 3 h,
obtained Ni/γ-Al2O3, Ni/Mordenite, and Ni/ZAA catalysts. Characterization of the
catalysts has been conducted by X-ray diffraction (XRD), infrared spectrometry
(FT-IR), and atomic absorption spectroscopy (AAS) methods. Catalysts acidity
was determined by gravimetric method using ammonia and pyridine base vapor.
Activity test of catalysts has been performed through hydrocracking process of
polyethylene plastic type LDPE (Low Density Polyethylene) over these catalysts
with various temperatures of 350, 400, and 450 °C under operation condition of
hydrogen flow rate of 20 mL/min for an hour, feed/catalyst ratio of 5. The liquid
yield of hydrocracking was analyzed by gas chromatography (GC) and gas
chromatography-mass spectrometer (GC-MS).
, Mordenite, and ZAA
The XRD results showed that acid treatment toward ZA and loading of
nickel metal onto γ-Al2O3 did not ruin the crystalinity of
catalysts significantly. According to FTIR spectrum, the acid treatment toward ZA
sample caused dealumination and loss of cristalline and amorpous impurities so
that increased Si/Al ratio qualitatively. The acid treatment and loading of nickel
metal also increased the acid amount of catalysts. The highest conversion of liquid
yield was obtained by Ni/Mordenite catalyst at 400 °C as much as 63.62 wt% with
the total conversion of gasoline and diesel fractions as much as 42.32 wt% and
21.30 wt% that consisted of isoparaffins, naphthenes, and oleffins.
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