TY - JOUR
T1 - Mesoporous and nanostructured CeO as supports of nano-sized gold catalysts for low-temperature water-gas shift reaction
AU - Yuan, Z.-Y.
AU - Idakiev, V.
AU - Vantomme, A.
AU - Tabakova, T.
AU - Ren, T.-Z.
AU - Su, B.-L.
PY - 2008/2/29
Y1 - 2008/2/29
N2 - Mesoporous particles and 1D nanorods of cerium oxides have been prepared by modifying the hydrothermal route of a surfactant-assisted controllable synthesis. Mesoporous cerias were obtained in a sealed glass vessel under continuous stirring, while ceria nanorods were obtained in a Teflon-lined autoclave without stirring. The mesoporous cerias did not show long-range mesoscopic organization, exhibiting a broad mesopore size distribution in the region 8-15 nm. A BET surface area of 100 m/g with a total pore volume of 0.33 cm/g is obtained for as-synthesized mesoporous ceria. The ceria nanorods exhibit a cubic crystalline structure after calcination, having the lengths in the range of 150-300 nm and diameters in the range of 10-25 nm. The growth direction of ceria nanorods is along [1 1 0]. A surface area of above 50 m/g is obtained in the calcined nanorods. These synthesized ceria materials were used as supports of nano-sized gold catalysts, prepared by deposition-precipitation method. Their catalytic activity was evaluated by the low-temperature water-gas shift reaction. The gold/mesoporous ceria catalytic system exhibited higher catalytic activity than gold/ceria nanorods. It is revealed that the mesoporous and nanostructured cerias are of much interest as potential supports for gold-based catalysts that are effective for low-temperature water-gas shift reaction.
AB - Mesoporous particles and 1D nanorods of cerium oxides have been prepared by modifying the hydrothermal route of a surfactant-assisted controllable synthesis. Mesoporous cerias were obtained in a sealed glass vessel under continuous stirring, while ceria nanorods were obtained in a Teflon-lined autoclave without stirring. The mesoporous cerias did not show long-range mesoscopic organization, exhibiting a broad mesopore size distribution in the region 8-15 nm. A BET surface area of 100 m/g with a total pore volume of 0.33 cm/g is obtained for as-synthesized mesoporous ceria. The ceria nanorods exhibit a cubic crystalline structure after calcination, having the lengths in the range of 150-300 nm and diameters in the range of 10-25 nm. The growth direction of ceria nanorods is along [1 1 0]. A surface area of above 50 m/g is obtained in the calcined nanorods. These synthesized ceria materials were used as supports of nano-sized gold catalysts, prepared by deposition-precipitation method. Their catalytic activity was evaluated by the low-temperature water-gas shift reaction. The gold/mesoporous ceria catalytic system exhibited higher catalytic activity than gold/ceria nanorods. It is revealed that the mesoporous and nanostructured cerias are of much interest as potential supports for gold-based catalysts that are effective for low-temperature water-gas shift reaction.
UR - http://www.scopus.com/inward/record.url?scp=38349127680&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2007.10.050
DO - 10.1016/j.cattod.2007.10.050
M3 - Article
AN - SCOPUS:38349127680
SN - 0920-5861
VL - 131
SP - 203
EP - 210
JO - Catalysis Today
JF - Catalysis Today
IS - 1-4
ER -