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Synthesis of Hydrotalcite-Like Precursor Compounds MgCo(11) Co(111).-HTlcs

Published online by Cambridge University Press:  15 February 2011

H.C. Zeng ,
Z.P. Xu  and
M. Qian
H.C. Zeng
Affiliation:
Department of Chemical and Environmental Engineering, Faculty of Engineering National University of Singapore, 10 Kent Ridge Crescent, Singapore119260Email address: chezhc@nus.edu.sg
Z.P. Xu
Affiliation:
Department of Chemical and Environmental Engineering, Faculty of Engineering National University of Singapore, 10 Kent Ridge Crescent, Singapore119260
M. Qian
Affiliation:
Department of Chemical and Environmental Engineering, Faculty of Engineering National University of Singapore, 10 Kent Ridge Crescent, Singapore119260
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Abstract

Precursor compounds of MgCo(11)Co(111)-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 Co+3, resulting in formation of hydrotalcite-like (HTI) 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+.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 549: Symposium FF – Advanced Catalytic Materials - 1998 , 1998 , 85
Copyright
Copyright © Materials Research Society 1999

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References

1. Cavani, F., Trifiro, F., and Vaccari, A., Catal. Today 11, p. 173 (1991).Google Scholar
2. Reichle, W.T., Solid State Ionics 22, p. 135 (1986).Google Scholar
3. Ulibarri, M.A., Fernandez, J.M., Labajos, F.M., and Rives, V., Chem. Mater. 3, p. 626 (1991).Google Scholar
4. Kannan, S., and Swamy, C.S., J. Mater. Sci. Lett. 11, p. 1,585 (1992).Google Scholar
5. Tsuji, M., Mao, G., Yoshida, T., and Tamaura, Y., J. Mater. Res. 8, p. 1,137 (1993).Google Scholar
6. Porta, P., Morpurgo, S., and Pettiti, I., J. Solid State Chem. 121, p. 372 (1992).Google Scholar
7. Morpurgo, S., Jacono, M.L., and Porta, P., J. Solid State Chem. 122, p. 324 (1996).Google Scholar
8. Kannan, S., and Swamy, C.S., Appl. Catal. B 3, p. 109 (1994).Google Scholar
9. Armor, J.N., Braymer, T.A., Li, Y., Petrocelli, E.P., Weist, E.L., Kannan, S., and Swamy, C.S., Appl. Catal. B 7, p. 397 (1996).Google Scholar
10. Qian, M., and Zeng, H.C., J. Mater. Chem. 7, p. 493 (1997).Google Scholar
11. Zeng, H.C., Xu, Z.P. and Qian, M., Chem. Mater. 10, p. 2,277 (1998).Google Scholar
12. Labajos, F.M., and Rives, V., Inorg. Chem. 35, p. 5,313 (1996).Google Scholar
13. Zeng, H.C., and Tung, S.K., Chem. Mater. 8, p. 2,667 (1996).Google Scholar
14. Grey, I.E., and Ragozzini, R., J. Solid State Chem. 94, p. 244 (1991).Google Scholar
15. Ulibarri, M.A., Hernandez, M.J., and Cornejo, J., J. Mater. Sci. 26, p. 1,512 (1991).Google Scholar
16. Chisem, I.C., and Jones, W., J. Mater. Chem. 4, p. 1,737 (1994).Google Scholar
17. Kruissink, E., van Reijen, L.L., and Ross, J. R. H., J. Chem. Soc., Faraday Trans. 177, p. 649 (1981).Google Scholar
18. Busca, G., Trifiro, F., and Vaccari, A., Langmuir 6, p. 1,440 (1990).Google Scholar
19. Fernandez, J.M., Barriga, C., Ulibarri, M.A., Labajos, F.M., and Rives, V., J. Mater. Chem. 4, p. 1,117 (1994).Google Scholar
20. Lutz, H.D., and Feher, M., Spectrochim. Acta A 27, p. 357 (1971).Google Scholar
21. Preudhomme, J., and Tarte, P., Spectrochim. Acta A 27, p. 1,817 (1971).Google Scholar
22. Pesic, L., Salipurovic, S., Markovic, V., Vucelic, D., Kagunya, W., and Jones, W., J. Mater. Chem. 2, p. 1,069 (1992).Google Scholar