English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/183775
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Size-activity relationship of iridium particles supported on silica for the total oxidation of volatile organic compounds (VOCs)

AuthorsSchick, Lukas; Sanchis, Rut; González-Alfaro, Vicente; Agouram, S.; López Sebastián, José Manuel ; Torrente-Murciano, Laura; García Martínez, Tomás ; Solsona, Benjamín
Short chain alkanes
Total oxidation
Size-activity relationship
Issue Date13-Feb-2019
CitationChemical Engineering Journal 366: 100-111 (2019)
AbstractThis systematic catalytic study reveals for the first time a strong size-activity relationship of iridium-based catalysts for the total oxidation of short chain alkanes reaction. Silica has been selected as support for its inertness and weak silica-iridium interaction to avoid its contribution to the catalytic activity. The size of the iridium particles can be increased from ∼5 to 27 nm by increasing the calcination temperature from 350 to 750 °C. Unlike other precious metals such as palladium or platinum, in the case of iridium catalysts, the oxidation activity increases when the size decreases. This effect is also maintained when the activity is normalized per metallic surface area revealing a higher intrinsic activity as the iridium size decreases beyond its simple increase in metallic surface area. Indeed, as the particle size decreases, a higher proportion of highly reducible iridium species as well as an increase in defective Ir3+ species on the surface is observed by XPS, directly related to the enhanced activity. The highly reducible species are oxidized under the reaction conditions, leading to an initial decrease in activity before reaching a stable rate of oxidation reaction. This knowledge provides useful guidelines for the design of iridium-based systems for the total oxidation of volatile organic compounds at low temperatures.
Description12 Figures, 2 Tables.-- Datos suplementarios disponibles en línea en la página web del editor.-- © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher version (URL)http://dx.doi.org/10.1016/j.cej.2019.02.087
Appears in Collections:(ICB) Artículos
Files in This Item:
File Description SizeFormat 
ChemEngJour_366_Schick_2019.pdf Embargoed until February 13, 2021Artículo principal4,8 MBAdobe PDFThumbnail
View/Open    Request a copy
Chemical Engineering J 366 100-111 (2019)_info sup.pdf Embargoed until February 13, 2021Información suplementaria6,97 MBAdobe PDFThumbnail
View/Open    Request a copy
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.