Na-Al alloy using Co/C catalyst at various mass variations of the catalyst was successfully synthesized. The alloy of Na and Al metals are made with a mole ratio (1: 1) and a milling time of 3 hours and a Ball to Powder Ratio (BPR) (10: 1). Based on the characterization results of XRD, the Na-Al + Co / C alloy formed according to JCPDS (No 22-1337) and JCPDS (No 42-1467). Meanwhile, the results…