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”

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”

Bibliographic Details
Parent link:Fuel
Vol. 110 : IMCCRE 2012 “International-Mexican Congress on Chemical Reaction Engineering”.— 2013.— [P. 40-47]
Other Authors: Bogdanchikova N., Pestryakov A. N. Aleksey Nikolaevich, Tuzovskaya I., Zepeda T. A., Farias M. H., Tiznado H., Martynyuk O. A. Oksana Anatolievna
Summary: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
Language:English
Published: 2013
Subjects:
электронный ресурс
труды учёных ТПУ
gold
золото
silica
кремнеземы
oxidation
окисление
clusters
кластеры
nanoparticles
наночастицы
Online Access:http://dx.doi.org/10.1016/j.fuel.2012.09.064
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=636298

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