Physico-chemical characterization of Ni/MCM-41 synthesized by a template ion exchange approach

摘要: A template ion exchange approach has been employed to prepare Ni/MCM-41 with varying nickel loadings. The synthesized samples were studied by nitrogen physisorption, X-ray diffraction, atomic absorption spectroscopy, transmission electron microscopy, energy-dispersive photoelectron temperature-programmed reduction and Fourier transform infrared spectroscopy. Extensive compound formation was found result from the adopted preparation method. Ni(II) phase elucidated be a silicate layer structure. Corresponding layers comprised of an octahedral sheet in between two tetrahedral SiO4 sheets. Nickel accompanied simultaneous dissolution support material. most likely deposited onto external surface MCM-41 particles. Temperature-programmed desorption ammonia used investigate influence content on acidity. Moderate acidity for undoped Introduction led additional types acid sites weak moderate characteristics.