Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/92399
Title: Synthesis of hydrotalcite-like precursor compounds MgCo(II)Co(III)-HTlcs
Authors: Zeng, H.C. 
Xu, Z.P. 
Qian, M.
Issue Date: 1999
Source: 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

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

32
checked on Feb 24, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.