Synthesis of Co/Mesoporous Silica-Alumina Catalyst from Sidoarjo Mud Templated by Bovine Bone's Gelatin for Hydrocracking of Waste Lubricant

Abstract

The synthesis of Co/Mesoporous Silica-Alumina (MSA) catalyst from Sidoarjo mud templated by bovine bone’s gelatin for hydrocracking of waste lubricant has been done. The gelatin was obtained from bovine bone by the combination method of acids (CH 3 COOH 4% and HCl 1 M) and base (NaOH 0.1 M). The silica was obtained from Sidoarjo mud using the batch method (distilled water, HCl 6 M, and NaOH 6 M). The synthesis of MSA was carried out using silica from Sidoarjo mud with the variation of Si/Al of 25, 50, and 100, respectively, using gelatin as a template to produce MSA(25), MSA(50), and MSA(100); and was then analyzed by FTIR and acidity test. The MSA with the highest acidity and optimum thermal stability (MSA(x)) was analyzed by GSA and TEM. The cobalt metal from Co(NO 3 ) 2 ·6H 2 O as salt precursor was loaded to the MSA(x) using the Wet Impregnation (WI) and Ion Exchange (IE) method. The Co/SAM(x) was tested as a catalyst for hydrocracking of waste lubricant oil. The results showed that the MSA(100) has the highest acidity and optimum thermal stability with an average pore diameter of 3.37 nm, the pore volume of 0.87 cm 3 g –1 , and a surface area of 230.73 m 2 . The cobalt metal content loaded on the MSA(100) by WI and EI method was 0.50% and 0.15 wt.%, respectively. The hydrocracking of lubricant oil using Co/MSA(100)WI catalyst yielded a liquid fraction of 39.20 wt.% with selectivity for gasoline and diesel fraction of 29.30 and 9.48 wt.%. The Co/MSA(100)IE catalyst produced a liquid fraction of 28.10 wt.% with selectivity for gasoline and diesel fraction of 22.70 and 5.32 wt.%.