1. Identification of Subnanometric Ag Species, Their Interaction with Supports and Role in Catalytic CO Oxidation
- Author
-
Yulia Kotolevich, Ekaterina Kolobova, Evgeniy Khramov, Jesús Efren Cabrera Ortega, Mario H. Farías, Yan Zubavichus, Rodolfo Zanella, Josué D. Mota-Morales, Alexey Pestryakov, Nina Bogdanchikova, and Vicente Cortés Corberán
- Subjects
silver catalysts ,subnanometer species ,CO oxidation ,sensitivity to pretreatments ,interaction with support ,Organic chemistry ,QD241-441 - Abstract
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
- Published
- 2016
- Full Text
- View/download PDF