It has been shown that Ru nanoparticles deposited on carbon nanotubes (CNTs) act as an active, stable catalyst for the decomposition of ammonia. This work aims at developing low cost Ni-based catalysts. Catalysts were prepared from two Ni precursors by wet impregnation and H2 reduction. Several methods were tested to optimize the impregnation, such as treatment with 3M HNO3 and KOH. The Ni was deposited by refluxing the tubes in a Ni(NO3)2/water, or in toluene solution of Nickelocene (NiCp2). The Ni/CNT catalysts proved to be effective in the decomposition of ammonia. The catalytic performance was evaluated in a continuous flow quartz reactor, the output of which was analyzed with gas chromatography. Initial data show that the catalyst prepared by depositing Ni from Ni(NO3)2 solution, has the best conversion. After analyzing the peak area of unreacted ammonia compared to calibration data at a given flow rate, the best performing catalysts were analyzed with high resolution transmission electron microscopy (TEM), coupled with energy dispersive spectroscopy. TEM images confirm the presence of Ni nanoparticles on the nanotubes, from both preparation methods. However, Ni particles deposited from NiCp2 are smaller in size and more abundant. Future work is aimed at achieving a homogenious particle size and distribution, but it is clear that Ni nanoparticles on CNTs are an active inexpensive catalyst for ammonia decomposition.