Green diesel is an alkane compound produced from vegetables oil by hydrogenation which has properties similar to diesel fuel. The ingredients that can be converted into green diesel is Crude Palm Oil (CPO). Green diesel is produced using a catalytic hydrogenation process with 10-30 psia hydrogen injection, the use of natural zeolite catalysts with the variation of catalyst by 1 wt%, 2 wt%, 3 wt% and 4 wt%, and temperatures of 350°C, 375°C, and 400°C for 3 h. The purpose of this research is to obtain optimum conditions in the process of hydrotreating CPO into green diesel. The use of 3 wt% of zeolite catalyst at 400°C and H2 pressure 30 psia was the optimum condition in this study and resulted in a yield percentage of 37.30%. The physical properties of green diesel obtained from this study include density (782.41-807.99 kg/m3), kinematic viscosity (2.24-2.53 cSt), and flash point (55.1-58.5°C).

The reaction of aluminum (Al) INTRODUCTIONHydrogen is a promising alternative energy for carbon-based fuel substitution. The advantages of hydrogen fuel are free emissions of COx and SOx and its high heating value (HHV = 142 MJ/kg and LHV = 120.2 MJ/kg) or about three times higher than the heating value of gasoline. Gutbier and Hohne (1976) attempted to produce hydrogen through a reaction between magnesium-aluminum and seawater. Soler et al. (2005) reported the reaction of aluminum powder with sodium hydroxide solution (NaOH) produced an optimum yield of hydrogen at temperature of 70-90 o C. However, higher yield was obtained in reacting aluminum with sodium aluminate (NaAlO2) than that of NaOH solution (Soler et al., 2009).

Biodiesel is methyl or ethyl esters which is an alternative fuel for diesel engines that is produced by chemical reaction of vegetable oil or animal fat with alcohol such as methanol. The reaction requires a catalyst that is usually a strong base, such as potassium hydroxide. The purpose of this research was to produced biodiesel from Bintaro seed with potassium hydroxide as catalyst that have quality based on Standard Biodiesel Quality (SNI 7182:2015). Degumming process is required to remove the gum and the other impurities of vegetable oil which is the raw material for biodiesel production by using weak acids, such as phosphoric acid and citric acid was studied in this research. The experiment used catalyst with concentration 0.6-1.2 % (v/v) of raw material and the result shows the highest yield of biodiesel at 0.6 %(v/v) was 87.6 %. The characterization of methyl ester from bintaro seeds has the value that fulfilled the recommendation of biodiesel standards.

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One of the aims of this research is to implement the use of nature as the source of learning in class X MAN 4 Pidie of the academic year 2018/2019. This study is a classroom action research which was conducted in two cycles. Each cycle consisted of planning, acting, observing and reflecting. The subjects of the research were the students of MAN 4 class X. They were 36 students. The object of the study is biology in class X – which was implemented through the use of nature as media to learn. The result indicated that there were improvements in students understanding through learning by nature, it can be seen that the percentage was increased in each cycle. Cycle   I, 65.25 %, cycle II, 91. 5 %. It was increased 26,25%.