Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation

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, Vicente Cortés Corberán

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 <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.

Original languageEnglish
Article number532
JournalMolecules
Volume21
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016

Fingerprint

Particle Size
catalysts
pretreatment
Oxidation
oxidation
Catalysts
Carbon Monoxide
Catalysis
Silver
Catalyst supports
Particle size analysis
Oxidation-Reduction
X ray photoelectron spectroscopy
Metals
sensitivity
Particle size
interactions
particle size distribution
catalysis
silver

Keywords

  • CO oxidation
  • Interaction with support
  • Sensitivity to pretreatments
  • Silver catalysts
  • Subnanometer species

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

Cite this

Kotolevich, Y., Kolobova, E., Khramov, E., Cabrera Ortega, J. E., Farías, M. H., Zubavichus, Y., ... Corberán, V. C. (2016). Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation. Molecules, 21(4), [532]. https://doi.org/10.3390/molecules21040532

Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation. / Kotolevich, Yulia; Kolobova, Ekaterina; Khramov, Evgeniy; Cabrera Ortega, Jesús Efren; Farías, Mario H.; Zubavichus, Yan; Zanella, Rodolfo; Mota-Morales, Josué D.; Pestryakov, Alexey; Bogdanchikova, Nina; Corberán, Vicente Cortés.

In: Molecules, Vol. 21, No. 4, 532, 01.04.2016.

Research output: Contribution to journalArticle

Kotolevich, Y, Kolobova, E, Khramov, E, Cabrera Ortega, JE, Farías, MH, Zubavichus, Y, Zanella, R, Mota-Morales, JD, Pestryakov, A, Bogdanchikova, N & Corberán, VC 2016, 'Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation', Molecules, vol. 21, no. 4, 532. https://doi.org/10.3390/molecules21040532
Kotolevich, Yulia ; Kolobova, Ekaterina ; Khramov, Evgeniy ; Cabrera Ortega, Jesús Efren ; Farías, Mario H. ; Zubavichus, Yan ; Zanella, Rodolfo ; Mota-Morales, Josué D. ; Pestryakov, Alexey ; Bogdanchikova, Nina ; Corberán, Vicente Cortés. / Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation. In: Molecules. 2016 ; Vol. 21, No. 4.
@article{3e9ab5f9ed72436da8aa0d8bd71964ed,
title = "Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation",
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 <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.",
keywords = "CO oxidation, Interaction with support, Sensitivity to pretreatments, Silver catalysts, Subnanometer species",
author = "Yulia Kotolevich and Ekaterina Kolobova and Evgeniy Khramov and {Cabrera Ortega}, {Jes{\'u}s Efren} and Far{\'i}as, {Mario H.} and Yan Zubavichus and Rodolfo Zanella and Mota-Morales, {Josu{\'e} D.} and Alexey Pestryakov and Nina Bogdanchikova and Corber{\'a}n, {Vicente Cort{\'e}s}",
year = "2016",
month = "4",
day = "1",
doi = "10.3390/molecules21040532",
language = "English",
volume = "21",
journal = "Molecules",
issn = "1420-3049",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "4",

}

TY - JOUR

T1 - Identification of subnanometric ag species, their interaction with supports and role in catalytic co oxidation

AU - Kotolevich, Yulia

AU - Kolobova, Ekaterina

AU - Khramov, Evgeniy

AU - Cabrera Ortega, Jesús Efren

AU - Farías, Mario H.

AU - Zubavichus, Yan

AU - Zanella, Rodolfo

AU - Mota-Morales, Josué D.

AU - Pestryakov, Alexey

AU - Bogdanchikova, Nina

AU - Corberán, Vicente Cortés

PY - 2016/4/1

Y1 - 2016/4/1

N2 - 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.

AB - 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.

KW - CO oxidation

KW - Interaction with support

KW - Sensitivity to pretreatments

KW - Silver catalysts

KW - Subnanometer species

UR - http://www.scopus.com/inward/record.url?scp=84969622275&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84969622275&partnerID=8YFLogxK

U2 - 10.3390/molecules21040532

DO - 10.3390/molecules21040532

M3 - Article

VL - 21

JO - Molecules

JF - Molecules

SN - 1420-3049

IS - 4

M1 - 532

ER -