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- W1995404612 abstract "Anionic clays with hydrotalcite-type (HT) structures (mixed hydroxides containing exchangeable anions) have many interesting industrial applications; in particular, they may be useful precursors of multicomponent catalysts such as, for example, Ni/Al catalysts for steam reforming of methane and higher paraffins. The structure and the synthesis of HT anionic clays are examined in order to identify the key factors involved in the preparation of pure compounds, the homogeneity of which can be verified by various techniques (XRD, EXAFS, 27Al NMR and TG analysis). TG and DSC analyses of HT precipitates show that their decomposition involves an initial loss of interlayer water followed by the elimination of hydroxide and carbonate ions, with some differences related to the composition and crystallinity of the samples. The aluminum-containing samples obtained by thermal decomposition exhibit high surface area and stability, and are characterized by the small size and the low reducibility of NiO particles. For Ni/Al and Ni/Cr samples, the formation of spinel phases has a negative effect, giving rise to remarkable increases in both NiO crystal size and reducibility, while for Ni/Mg/Al samples this increase of reducibility is not necessarily observed always as a function of the formation of NiO/MgO solid solutions. A model for Ni/Al mixed oxides obtained from HT anionic clays is proposed involving the formation of NiO and Ni-doped alumina phases, which strongly interact with a spinel-type phase present at their interface. This phase is thought to be responsible for the thermal stability and low reducibility of the NiO particles. The validity of this model is discussed as a function of the different HT anionic clay compositions examined and of the phases formed at different calcination temperatures." @default.
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- W1995404612 date "1993-08-01" @default.
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- W1995404612 title "Synthesis and thermal reactivity of nickel-containing anionic clays" @default.
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- W1995404612 doi "https://doi.org/10.1016/0169-1317(93)90035-y" @default.
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