Characterization of reduced natural garnierite and its catalytic activity for carbon monoxide hydrogenation
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AbstractNatural garnierite, a nickel-containing mineral from New Caledonia, was reduced in hydrogen. The mineral and its reduced forms were characterized by X-ray diffraction, electron microscopy, and microprobe analysis. The reduction was followed volumetrically and the Ni0 phase characterized by H2 chemisorption. The catalytic activity of this mineral was determined in the hydrogenation reaction of carbon monoxide. Experiments were done in typical methanation and so-called Fischer-Tropsch conditions. The mineral consists of a mixture of a 10-Å phase (talc-like fluffy particles) and a 7-Å serpentine-like phase (fibers). The major amount of nickel is associated with the talc phase. Minor amounts are in the serpentine fibers and possibly substituted in the lattice of the minerals. Qualitative evidence for a redispersion of Ni in the serpentine fibers is advanced. At the moment this occurs, the turnover numbers of CO disappearance are optimum. Compared to other supports, they are considerably lower. The product distribution is within C1–C4 and follows closely a Schulz-Flory distribution.

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