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|Title:||Synthesis of hydrotalcite-like precursor compounds MgCo(II)Co(III)-HTlcs||Authors:||Zeng, H.C.
|Issue Date:||1999||Citation:||Zeng, H.C.,Xu, Z.P.,Qian, M. (1999). Synthesis of hydrotalcite-like precursor compounds MgCo(II)Co(III)-HTlcs. Materials Research Society Symposium - Proceedings 549 : 85-90. ScholarBank@NUS Repository.||Abstract:||Precursor compounds of MgCo(II)Co(III)-HTlcs for Mg-Co oxide catalysts have been synthesized by coprecipitation in an ammoniacal solution and hydrothermal treatments under various O2/N2 atmospheres. Using elemental analysis (EA) and redox titration, it is found that about 23% of original Co2+ are oxidized to Co3+, resulting in formation of hydrotalcite-like (HTl) structure. The anion (NO3 -) intercalation increases with the rise in O2 partial pressure. X-ray diffraction pattern shows a conversion from brucite-like to HTl structures with increase of O2 partial pressure. It is found that thermal stability of the HTl-compounds is proportional to the Mg content. Higher specific surface areas are observed for decomposed products with low Co/Mg ratio. A trace amount of Co3O4 is also detected by FTIR for samples synthesized under high O2 partial pressures, which can be attributed to a deeper oxidation of Co2+.||Source Title:||Materials Research Society Symposium - Proceedings||URI:||http://scholarbank.nus.edu.sg/handle/10635/92399||ISSN:||02729172|
|Appears in Collections:||Staff Publications|
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