Abstract
A mix-valenced cobalt oxide, CoOx, was prepared from cobalt nitrate aqueous solution through a precipitation with sodium hydroxide and an oxidation by hydrogen peroxide. Further, other pure cobalt oxide species were refined from the CoOx by temperature-programmed reduction (TPR) at 170, 230 and 300 °C (labeled as R-170, R-230 and R-300, respectively). They were characterized by X-ray (XRD), infrared (IR), thermogravimetry (TG) and TPR. The major composition of CoOx is CoO(OH), with a small amount of Co4+ species; R-170 is CoO(OH) with a hexagonal structure; R-230 is Co3O4 with a spinel structure and R-300 is CoO with a cubic structure. Their catalytic activities toward the CO oxidation were further studied in a continuous flow microreactor. The results indicated that the relative activity decreased significantly with the oxidation state of cobalt, i.e., CoO(+2)≳Co3O4(+8/3)≫CoO(OH)( +3)≳CoOx(>+3).
Similar content being viewed by others
References
Y. J. Mergler, A. van Aalst, J. van Delft and B. E. Nieuwenhuys, J. Catal. 161 (1996) 310.
Y. J. Mergler, A. van Aalst, J. van Delft and B. E. Nieuwenhuys, Appl. Catal. B10 (1996) 245.
K. Omata, T. Takada, S. Kasahara and M. Yamada, Appl. Catal. A146 (1996) 255.
Y. J. Mergler, J. Hoebink and B. E. Nieuwenhuys, J. Catal. 167 (1997) 305.
J. Jansson, J. Catal. 194 (2000) 55.
H. Hamada, Y. Kintaichi, M. Inaba, M. Tabata, T. Yoshinari and H. Tsuchida, Catal. Today 29 (1996) 53.
A. Torncrona, M. Skoglundh, P. Thormahlen, E. Fridell and E. Jobson, Appl. Catal. B14 (1997) 131.
D. Pietrogiacomi, S. Tuti, M. C. Campa and V. Indovina, Appl. Catal. B28 (2000) 43.
E. Garbowski, M. Guenin, M. C. Marion and M. Primet, Appl. Catal. 64 (1990) 209.
A. S. K. Sinha and V. Shankar, J. Chem. Eng. Biochem. Eng. 52 (1993) 115.
F. Lichtenberg and K. Kleinsorgen, J. Power Sources 62 (1996) 207.
E. Antolini and E. Zhecheva, Mater. Lett. 35 (1998) 380.
T. J. Boyle, D. Ingersoll, T. M. Alam, C. J. Tafoya, M. A. Rodriguez, K. Vanheusden and D. H. Doughty, Chem. Mater. 10 (1998) 2770.
H. Yamaura, J. Tamaki, K. Moriya, N. Miura and N. Yamazoe, J. Electrochem. Soc. 144 (1997) L158.
H. Yamaura, K. Moriya, N. Miura and N. Yamazoe, Sens. Actuators B65 (2000) 39.
E. Gulari, C. Guldur, S. Srivannavit and S. Osuwan, Appl. Catal. A182 (1999) 147.
D. R. Lide, Handbook of Chemistry and Physics, 72nd ed. (1991–1992). CRC Press.
R. B. King, Encyclopedia of Inorganic Chemistry, Vol. 2 (John Wiley & Sons, 1994).
R. Van Zee, Y. Hamrick, S. Li and W. Weltner, J. Phys. Chem. 96 (1992) 7247.
M. Elemongy, M. Gouda and Y. Elewady, J. Electroanal. Chem. 76 (1977) 367.
D. Chen, Y. Wen and N. N. Rommel, J. Electrochem. Soc. 131 (1984) 731.
St. G. Christoskova, M. Stoyanova, M. Georgieva and D. Mehandjiev, Mater. Chem. Phys. 60 (1999) 39.
C. Spenser and D. Schroeder, Phys. Rev. B9 (1974) 3658.
R. G. Delaplane, J. A. Ibers, J. R. Ferraro and J. Rush, J. Chem. Phys. 50 (1969) 1921.
T. Andrushkevich, G. Boreskov, V. Popovskii, L. Pliasova, L. Karakchiev and A. Ostankovitch, Kinet. Katal. 6 (1968) 1244.
H. K. Lin, C. B. Wang, H. C. Chiu and S. H. Chien, Catal. Lett. (2002); 86 (2003) 63.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lin, HK., Chiu, HC., Tsai, HC. et al. Synthesis, Characterization and Catalytic Oxidation of Carbon Monoxide over Cobalt Oxide. Catalysis Letters 88, 169–174 (2003). https://doi.org/10.1023/A:1024013822986
Issue Date:
DOI: https://doi.org/10.1023/A:1024013822986