Abstract
Two original methods of preparation of lanthana with hexagonal structure as well as the stabilization of its cubic structure by addition of yttria were investigated. The physical properties and the catalytic behaviour of these samples are compared with classical preparations. The influence of the preparation techniques and of the pretreatment on the specific area, morphology and chemisorption of probe molecules were tested, the latter using mainly Fourier transform infrared spectroscopy. Catalytic tests, operated at high CO-H2 pressure and high temperature, led to the classical isosynthesis product distribution. The prepared lanthana samples are active in the hydrogenation of carbonate to formate species which can be involved in the formation of formaldehyde in the first step of the isosynthesis reaction. The evolution of the oxide catalysts to hydrates and carbonates during the reaction was studied.
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