TY - JOUR
T1 - Gold catalysts on TiO2 support for preferential oxidation of CO in H2 stream
T2 - Effect of base agent
AU - Sangeetha, Palanivelu
AU - Chang, Li Hsin
AU - Chen, Yu Wen
N1 - Funding Information:
This research was supported by the Ministry of Economical Affairs, Taiwan, Republic of China, under contract no. 97-EC-17-A-09-S1-022.
PY - 2009/11/15
Y1 - 2009/11/15
N2 - Au/TiO2 catalysts were prepared by deposition-precipitation method using various bases such as NaOH, NH4OH and urea. The catalysts were characterized by ICP-MS, XRD, TEM and XPS. The catalytic activity of these catalysts has been investigated for preferential oxidation of carbon monoxide in hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts by using different precipitating reagents, such as NaOH, NH4OH and urea. Au/TiO2 catalyst prepared by using NaOH as base agent shows higher deposition of gold on the TiO2 support when compared with other base agents. The uptake of gold on TiO2 decreased as the pH value increased from 5 to 9. The catalytic activity of CO oxidation increases as the metal loading increases and CO selectivity decreased with increasing reaction temperature on all catalysts. Au/TiO2 catalyst prepared by using NaOH as the base agent at low pH ∼6 is found to be the better catalyst, henceforth the catalytic activity is found to be higher for preferential oxidation of CO in H2 stream at 80 °C.
AB - Au/TiO2 catalysts were prepared by deposition-precipitation method using various bases such as NaOH, NH4OH and urea. The catalysts were characterized by ICP-MS, XRD, TEM and XPS. The catalytic activity of these catalysts has been investigated for preferential oxidation of carbon monoxide in hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts by using different precipitating reagents, such as NaOH, NH4OH and urea. Au/TiO2 catalyst prepared by using NaOH as base agent shows higher deposition of gold on the TiO2 support when compared with other base agents. The uptake of gold on TiO2 decreased as the pH value increased from 5 to 9. The catalytic activity of CO oxidation increases as the metal loading increases and CO selectivity decreased with increasing reaction temperature on all catalysts. Au/TiO2 catalyst prepared by using NaOH as the base agent at low pH ∼6 is found to be the better catalyst, henceforth the catalytic activity is found to be higher for preferential oxidation of CO in H2 stream at 80 °C.
KW - Base
KW - CO oxidation
KW - Deposition-precipitation
KW - Gold
KW - Titania
UR - http://www.scopus.com/inward/record.url?scp=70349761222&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2009.07.022
DO - 10.1016/j.matchemphys.2009.07.022
M3 - 期刊論文
AN - SCOPUS:70349761222
SN - 0254-0584
VL - 118
SP - 181
EP - 186
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 1
ER -