Vol 7, No 8 (2016) > Chemical Engineering >

Synthesis of Renewable Diesel from Palm Oil and Jatropha Curcas Oil through Hydrodeoxygenation using NiMo/Zal

Bambang Heru Susanto, Muhammad Bagus Prakasa, Mohammad Nasikin, Sukirno Sukirno


Abstract: Hydrodeoxygenation of
palm oil and Jatropha curcas oil over NiMo/ZAL (nickel molybdenum/zeolit alam
Lampung) catalyst was investigated under temperatures of 375°C and 400°C and H2
pressure of 15 bar in a semibatch stirred autoclave reactor. NiMo/ZAL catalyst
was prepared using a rapid cooling method. NiMo/ZAL characterization revealed a
crystal size of 70.07 nm, surface area of 12.25 m2/g, and pore size
and pore volume of 9.83 Å and 0.0062 cm3/g, respectively. The hydrodeoxygenation removal
pathway of palm oil and Jatropha curcas oil over NiMo/ZAL catalyst was
primarily achieved through decarboxylation. Under hydrogen pressure of 15 bar
and temperature of 375°C, palm oil and Jatropha curcas oil can be converted
into paraffin chains (from n-C15 up to n-C18) by a
decarboxylation reaction that produces water, methane, and COx gases
as byproducts and contains some undesirable reactions. These byproducts can
produce alkene bonds that form chains different
from those in conventional diesel fuel. The conversion was 80.87%, selectivity was 52.78%, and yield was 45.66%.
The hydrodeoxygenation reaction catalyzed by NiMo/ZAL catalyst was found to be
suitable for removing oxygen and producing paraffin chains; this increased the
heating value and stability of renewable diesel fuel.
Keywords: Hydrodeoxygenation; Jatropha curcas oil; NiMo/ZAL; Palm oil; Renewable diesel

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