Effect of nanosized gold particle addition to supported metal oxide catalyst in methanol oxidation.
Gold has rarely been utilized as a catalytic component because of its poor affinity to chemical species. It is however known that nanosized gold particles promote the dissociation of oxygen or hydrogen. In this study, alumina-supported metal oxide catalysts were prepared by impregnation method and applied to methanol oxidation. The dispersion form and size of the gold particles were observed by transmission electron microscopy (TEM). In the results, the maximum catalytic activity was obtained over the ZnO/Al2O3 catalyst, and the optimum loading was 4 wt%. Furthermore, nano-sized gold particles at various loadings were added to ZnO/Al2O3 catalyst by deposition method. The gold particles on Au/ZnO/Al2O3 catalyst were well dispersed and the catalyst activity was remarkably increased compared to ZnO/Al2O3 catalyst. The role of gold particles in the increased catalytic activity is discussed and a possible mechanism is presented.
Kim
Ki-Joong
KJ
Department of Chemical Engineering, Sunchon National University, 315 Maegok-dong, Suncheon-si, Jeonnam 540-742, Korea.
You
Young-Jae
YJ
Chung
Min-Chul
MC
Kang
Chan-Soon
CS
Chung
Kyong-Hwan
KH
Jeong
Woon-Jo
WJ
Jeong
Seung-Won
SW
Ahn
Ho-Geun
HG
D000537:Aluminum Oxide / Q000737:chemistry; D002384:Catalysis; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013696:Temperature; D015034:Zinc Oxide / Q000737:chemistry
D008670:Metals; D010087:Oxides; D006046:Gold; D000537:Aluminum Oxide; D010100:Oxygen; D015034:Zinc Oxide; D000432:Methanol