US EPA

1445330 

Journal Article 

Supported Co3O4-CeO2 catalysts on modified activated carbon for CO preferential oxidation in H-2-rich gases 

Bao, T; Zhao, Z; Dai, Y; Lin, X; Jin, R; Wang, G; Muhammad, T 

2012 

Yes 

Applied Catalysis B: Environmental
ISSN: 0926-3373 

119 

62-73 

10.1016/j.apcatb.2012.02.018 

WOS:000304691700008 

CO preferential oxidation (PROX) reactions were performed
over the supported Co3O4-CeO2 catalysts on modified activated carbon (AC) for eliminating the
trace CO from H-2-rich gases. The effects of support modification by H2O2 oxidation treatment,
catalyst calcination temperature, Ce/Co atomic ratio (n(Ce/Co)). Co3O4-CeO2 loading and reaction
parameters on catalytic properties of the Co3O4-CeO2/AC catalysts were investigated. Various
characterization techniques like scanning electron microscopy (SEM). X-ray diffraction (XRD) and
H-2 temperature-programmed reduction (H-2-TPR) were employed to reveal the relationship between
catalysts nature and catalytic performance. Results illustrate that the supported Co3O4-CeO2
catalyst on modified AC exhibits excellent catalytic properties, which highly depends on
dispersity and reducibility of Co3O4 affected by the time of support treatment (t(p)).
calcination temperature, n(Ce/Co) and loading. The supported 35 wt% Co3O4-CeO2 catalyst (1:8 of
n(Ce/Co)) on the modified AC with H2O2 oxidation treatment for 6 h demonstrates the best
catalytic properties and the almost complete CO transformation takes place in a wide temperature
range of 125-190 degrees C. Moreover, it is also found that the developed catalyst exhibits an
outstanding catalytic stability, and 100% CO conversion can be maintained as the time on stream
evolutes up to 1800 min even in the presence of CO2 and H2O in the feed. The optimized Co3O4-
CeO2/AC may be a robust and promising catalyst for eliminating trace CO from H-2-rich gases. (C)
2012 Elsevier B.V. All rights reserved. 

Activated carbon; Modification; Cobalt oxide; Ceria; CO preferential oxidation; Hydrogen