Journal
SOLID STATE IONICS
Volume 134, Issue 3-4, Pages 229-239Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(00)00772-4
Keywords
nickel nitrate hexahydrate; magnesium oxide; controlled thermal analysis; solid solution; nickel oxide reducibility
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Several NiO-MgO samples were prepared from nickel nitrate hexahydrate and different sources of magnesia by using a NiO/MgO weight ratio of 1:1 and 4:1 and two different preparative paths. All the samples were structurally characterized using BET, XRD, SEM and TPR techniques. The results showed that the sequence of decomposition of the Ni(NO3)(2) 6H(2)O-MgO systems is similar to the sequence reported for the nickel nitrate hexahydrate without magnesia. XRD identified complete solid solutions for all the NiO-MgO systems prepared. Their BET areas were similar but their different morphologies and particle sizes mainly depended on the preparative path. Independently of the magnesia used, the NiO-MgO systems prepared by controlled decomposition of the nickel nitrate hexahydrate until Ni-3(NO3)(2)(OH)(4) was formed and which were subsequently calcined to form NiO (path B) led to very homogeneous particles of sizes around 100 nm. Path B also gave the highest degrees of NiO reduction. (C) 2000 Elsevier Science B.V. All rights reserved.
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