Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface
碩士 === 國立中央大學 === 物理研究所 === 95 === We have studied the adsorption and decomposition of methanol on well-defined supported Au nanoclusters as a model catalyst by using synchrotron-based high-resolution photoemission spectroscopy (PES). Au nanoclusters are deposited on well-ordered Al2O3 film grown on...
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ndltd-TW-095NCU051980022017-07-09T04:29:40Z http://ndltd.ncl.edu.tw/handle/82083431818454577809 Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface Hung-wei Shiu 許紘瑋 碩士 國立中央大學 物理研究所 95 We have studied the adsorption and decomposition of methanol on well-defined supported Au nanoclusters as a model catalyst by using synchrotron-based high-resolution photoemission spectroscopy (PES). Au nanoclusters are deposited on well-ordered Al2O3 film grown on NiAl (100) through vapor deposition in the ultrahigh vacuum conditions (<3 x 10-10 torr) at 300 K, 450 K, and 570 K. Gold nanoclusters are studied by using both PES and scanning tunneling microscopy (STM). Form STM images, Au atoms nucleated on crystalline Al2O3 films as nanoclusters and the average size of Au nanoclusters is slightly increased at the deposition temperature of 450 K. However, at 570 K deposition temperature sudden change in the average size of Au nanoclusters is observed, which is probably due to higher diffusion coefficient. To study methanol decomposition, methanol was adsorbed on Au/Al2O3/NiAl (100) at 120 K and subsequently annealed to different temperatures. In our annealing experiment we observe that the methanol C1s peak shifts toward lower binding energy with annealing temperature, which indicates more than one intermediate C-species before it decomposes to CO. We also found the activity for methanol decomposition is highly dependent on the structure of supported Au catalyst. After annealing to 310 K, a sudden shift for C1s peaks may imply that C-O scission and reforming to another hydrocarbon species. Meng-Fan Luo 羅夢凡 2006 學位論文 ; thesis 80 en_US |
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碩士 === 國立中央大學 === 物理研究所 === 95 === We have studied the adsorption and decomposition of methanol on well-defined supported Au nanoclusters as a model catalyst by using synchrotron-based high-resolution photoemission spectroscopy (PES). Au nanoclusters are deposited on well-ordered Al2O3 film grown on NiAl (100) through vapor deposition in the ultrahigh vacuum conditions (<3 x 10-10 torr) at 300 K, 450 K, and 570 K. Gold nanoclusters are studied by using both PES and scanning tunneling microscopy (STM). Form STM images, Au atoms nucleated on crystalline Al2O3 films as nanoclusters and the average size of Au nanoclusters is slightly increased at the deposition temperature of 450 K. However, at 570 K deposition temperature sudden change in the average size of Au nanoclusters is observed, which is probably due to higher diffusion coefficient.
To study methanol decomposition, methanol was adsorbed on Au/Al2O3/NiAl (100) at 120 K and subsequently annealed to different temperatures. In our annealing experiment we observe that the methanol C1s peak shifts toward lower binding energy with annealing temperature, which indicates more than one intermediate C-species before it decomposes to CO. We also found the activity for methanol decomposition is highly dependent on the structure of supported Au catalyst. After annealing to 310 K, a sudden shift for C1s peaks may imply that C-O scission and reforming to another hydrocarbon species.
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author2 |
Meng-Fan Luo |
author_facet |
Meng-Fan Luo Hung-wei Shiu 許紘瑋 |
author |
Hung-wei Shiu 許紘瑋 |
spellingShingle |
Hung-wei Shiu 許紘瑋 Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface |
author_sort |
Hung-wei Shiu |
title |
Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface |
title_short |
Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface |
title_full |
Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface |
title_fullStr |
Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface |
title_full_unstemmed |
Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface |
title_sort |
catalytic properties of au nanoclusters supported on al2o3/nial (100) surface |
publishDate |
2006 |
url |
http://ndltd.ncl.edu.tw/handle/82083431818454577809 |
work_keys_str_mv |
AT hungweishiu catalyticpropertiesofaunanoclusterssupportedonal2o3nial100surface AT xǔhóngwěi catalyticpropertiesofaunanoclusterssupportedonal2o3nial100surface |
_version_ |
1718493894075744256 |