Identification of Subnanometric Ag Species, Their Interaction with Supports and Role in Catalytic CO Oxidation

Identification of Subnanometric Ag Species, Their Interaction with Supports and Role in Catalytic CO Oxidation

書誌詳細
Parent link:Molecules
Vol. 21, iss. 4.— 2016.— [532, 18 p.]
団体著者: Национальный исследовательский Томский политехнический университет Институт природных ресурсов Кафедра физической и аналитической химии
その他の著者: Kotolevich Y. Yulia, Kolobova E. N. Ekaterina Nikolaevna, Khramov E. Evgeniy, Cabrera Ortega Jesus Efren, Farias M. H. Mario, Zubavichus Y. Yan, Zanella R. Rodolfo, Mota-Morales J. D. Josue, Pestryakov A. N. Aleksey Nikolaevich, Bogdanchikova N. Nina, Corberan V. C. Vicente Cortes
要約:The nature and size of the real active species of nanoparticulated metal supported catalysts is still an unresolved question. The technique of choice to measure particle sizes at the nanoscale, HRTEM, has a practical limit of 1 nm. This work is aimed to identify the catalytic role of subnanometer species and methods to detect and characterize them. In this frame, we investigated the sensitivity to redox pretreatments of Ag/Fe/TiO2, Ag/Mg/TiO2 and Ag/Ce/TiO2 catalysts in CO oxidation. The joint application of HRTEM, SR-XRD, DRS, XPS, EXAFS and XANES methods indicated that most of the silver in all samples is in the form of Ag species with size <1 nm. The differences in catalytic properties and sensitivity to pretreatments, observed for the studied Ag catalysts, could not be explained taking into account only the Ag particles whose size distribution is measured by HRTEM, but may be explained by the presence of the subnanometer Ag species, undetectable by HRTEM, and their interaction with supports. This result highlights their role as active species and the need to take them into account to understand integrally the catalysis by supported nanometals.
出版事項: 2016
主題:
труды учёных ТПУ
электронный ресурс
серебряные катализаторы
предварительная обработка
чувствительность
オンライン･アクセス:http://dx.doi.org/10.3390/molecules21040532
フォーマット: 電子媒体 図書の章
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=649368

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