The effect of palladium precursors and the preparation route on the catalytic performance of mesoporous materials Pd/Al-MCM-41 in methane oxidation was investigated in this work. The catalysts were prepared using both methods, namely hydrothermal method (DHT) and template ion exchange method (TIE), from three different palladium precursors Pd(NH3)4Cl2, PdCl2(MeCN)2 and Pd(acac)2. All catalysts were characterized by a variety of physico-chemical techniques such as X-ray diffraction (XRD), N2 physisorption, H2 chemisorption, temperature programmed desorption of H2 , diffuse reflectance UV–visible spectroscopy andelemental analysis by ICP, and then tested in methane combustion. According to the obtained results, the use of different palladium precursors and preparation routes play an important role on the catalytic properties of materials. The use of bis(acetonitrile)palladium (II) chloride as precursor by the TIE method seems to conduct to the best catalytic performance. This is in agreement with a better dispersion of PdO nanoparticles, thus optimizing the accessibility of reactants to the active sites in the mesoporous channels of Al-MCM-41.
A. Gannouni, S. Zribi, R. Dardouri, M. Saïd Zina
Al-MCM-41, Palladium, Template ion exchange, Hydrothermal, Methane