The research of this study is to investigate Hydrotreating reaction of Palm Fatty Acid Distillate, Palm Olein and Palm Biodiesel using Nickel Molybdenum catalyst for Phase Change Material (PCM) production. The experiments were conducted in fixed bed continues-flow reactor at temperatures of 300, 320, 340, 360 and 380 ºC. Pressures were varied at 450, 750 and 1,050 psi. The experimental results demonstrated that all 3 types of reactants have a similar reaction and produce the products that consist of alkane 15 to 18 carbon atom. On the one hand, an increasing temperature resulted in the increasing of decarboxylation reaction of 3 reactants. On the other hand, the increased pressure lead to the increasing of Hydrodeoxygenation reaction. In addition, Different reactants are the cause of different product’s compositions and reaction conditions. Palm Fatty Acid Distillate is the most suitable for the even number of carbon atom contrast with Palm olein that suitable for the odd number of a carbon atom. Moreover, the reaction of Palm biodiesel occurred well at a lower temperature than other 2 reactants.