Effect of redox treatments on activation and deactivation of gold nanospecies supported on mesoporous silica in CO oxidation; Fuel; Vol. 110 : IMCCRE 2012 “International-Mexican Congress on Chemical Reaction Engineering”
| Parent link: | Fuel Vol. 110 : IMCCRE 2012 “International-Mexican Congress on Chemical Reaction Engineering”.— 2013.— [P. 40-47] |
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| Weitere Verfasser: | , , , , , , |
| Zusammenfassung: | Title screen The influence of pretreatments with He, O2 and H2 on the physicochemical and catalytic properties of gold supported on hexagonal mesoporous silica (HMS) has been studied by a variety of methods including: XPS, TPR, N2 sorption, UV-visible spectroscopy, FTIR and catalytic testing. The investigations show supported gold to form different states under redox treatments: Au3+ and Au+ ions, neutral and partly charged gold clusters and metal nanoparticles of different sizes. Reducing pretreatments increase the catalytic activity of the samples; while oxidative treatments deactivate the catalyst. Catalytic tests show several regions of the reduced samples with various catalytic behaviours: 20-200 °C, 200-400 °C and >400 °C; this situation is explained by the co-existence of gold active sites of different types. A comparative analysis among spectroscopic and catalytic data allows suggesting clusters to be responsible for the activity in the low-temperature region (<200 °C); neutral Aun clusters are active in the range 200-400 °C; and gold nanoparticles may catalyze high-temperature CO oxidation. Au3+ ions are inactive in this process. Режим доступа: по договору с организацией-держателем ресурса |
| Sprache: | Englisch |
| Veröffentlicht: |
2013
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| Schlagworte: | |
| Online-Zugang: | http://dx.doi.org/10.1016/j.fuel.2012.09.064 |
| Format: | Elektronisch Buchkapitel |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=636298 |
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| 200 | 1 | |a Effect of redox treatments on activation and deactivation of gold nanospecies supported on mesoporous silica in CO oxidation |f N. Bogdanchikova [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: p. 46-47 (70 tit.)] | ||
| 330 | |a The influence of pretreatments with He, O2 and H2 on the physicochemical and catalytic properties of gold supported on hexagonal mesoporous silica (HMS) has been studied by a variety of methods including: XPS, TPR, N2 sorption, UV-visible spectroscopy, FTIR and catalytic testing. The investigations show supported gold to form different states under redox treatments: Au3+ and Au+ ions, neutral and partly charged gold clusters and metal nanoparticles of different sizes. Reducing pretreatments increase the catalytic activity of the samples; while oxidative treatments deactivate the catalyst. Catalytic tests show several regions of the reduced samples with various catalytic behaviours: 20-200 °C, 200-400 °C and >400 °C; this situation is explained by the co-existence of gold active sites of different types. A comparative analysis among spectroscopic and catalytic data allows suggesting clusters to be responsible for the activity in the low-temperature region (<200 °C); neutral Aun clusters are active in the range 200-400 °C; and gold nanoparticles may catalyze high-temperature CO oxidation. Au3+ ions are inactive in this process. | ||
| 333 | |a Режим доступа: по договору с организацией-держателем ресурса | ||
| 461 | |t Fuel | ||
| 463 | |t Vol. 110 : IMCCRE 2012 “International-Mexican Congress on Chemical Reaction Engineering” |v [P. 40-47] |d 2013 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a gold | |
| 610 | 1 | |a золото | |
| 610 | 1 | |a silica | |
| 610 | 1 | |a кремнеземы | |
| 610 | 1 | |a oxidation | |
| 610 | 1 | |a окисление | |
| 610 | 1 | |a clusters | |
| 610 | 1 | |a кластеры | |
| 610 | 1 | |a nanoparticles | |
| 610 | 1 | |a наночастицы | |
| 701 | 1 | |a Bogdanchikova |b N. | |
| 701 | 1 | |a Pestryakov |b A. N. |c Chemist |c Professor of Tomsk Polytechnic University, Doctor of Chemical Science |f 1963- |g Aleksey Nikolaevich |3 (RuTPU)RU\TPU\pers\30471 |9 14796 | |
| 701 | 1 | |a Tuzovskaya |b I. | |
| 701 | 1 | |a Zepeda |b T. A. | |
| 701 | 1 | |a Farias |b M. H. | |
| 701 | 1 | |a Tiznado |b H. | |
| 701 | 1 | |a Martynyuk |b O. A. |c chemist |c Researcher of Tomsk Polytechnic University, Candidate of chemical sciences |f 1982- |g Oksana Anatolievna |3 (RuTPU)RU\TPU\pers\31284 |9 15462 | |
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