Simultaneous catalytic oxidation of carbon monoxide, hydrocarbons and soot with Ce–Zr–Nd mixed oxides in simulated diesel exhaust conditions
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10045/40799
Title: | Simultaneous catalytic oxidation of carbon monoxide, hydrocarbons and soot with Ce–Zr–Nd mixed oxides in simulated diesel exhaust conditions |
---|---|
Authors: | Xavier, Leandro P. dos Santos | Rico Pérez, Verónica | Hernández Giménez, Ana M. | Lozano-Castello, Dolores | Bueno López, Agustín |
Research Group/s: | Materiales Carbonosos y Medio Ambiente |
Center, Department or Service: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Keywords: | Diesel soot | Carbon monoxide | Hydrocarbons | Ceria–zirconia catalyst | Neodymium–ceria catalyst |
Knowledge Area: | Química Inorgánica |
Issue Date: | Jan-2015 |
Publisher: | Elsevier |
Citation: | Applied Catalysis B: Environmental. 2015, 162: 412-419. doi:10.1016/j.apcatb.2014.07.013 |
Abstract: | Ce0.73−xZr0.27NdxO2 mixed oxides (x ≤ 0.3) were prepared, characterized by XRD, Raman spectroscopy, N2 adsorption isotherms and H2-TPR, and tested for simultaneous CO, propylene, benzene and soot oxidation in a gas mixture containing O2, NOx, H2O, CO2, CO, propylene (model aliphatic hydrocarbon) and benzene (model aromatic hydrocarbon) that simulates a diesel exhaust. Ce–Zr mixed oxide doping with a low atomic fraction of neodymium (0.01 ≤ x ≤ 0.09) promotes the creation of oxygen vacancies, has a minor effect in the BET specific surface areas of the oxides, increases the surface ceria reducibility and has a positive effect in the catalytic activity. On the contrary, higher neodymium atomic fractions (x = 0.2 and 0.3) promote sintering, with a drastic decrease of the BET specific surface area, surface reducibility and catalytic activity. The Ce0.73−xZr0.27NdxO2 catalysts with x ≤ 0.09 are able to accelerate simultaneously soot, propylene and benzene combustion, and as a general trend, the catalytic behavior of Ce0.73Zr0.27O2 is improved by low atomic fraction neodymium doping (0.01 ≤ x ≤ 0.09). These Ce0.73−xZr0.27NdxO2 mixed oxides with 0.01 ≤ x ≤ 0.09 are also able to accelerate CO oxidation in a certain extent, but there is a net production of CO during soot combustion because the oxidation capacity of these oxides is not high enough to oxidize all CO released as soot combustion product. |
Sponsor: | The authors thank the financial support of CNPq – National Counsel of Technological and Scientific Development (Brazil), of the Spanish Ministry of Economy and Competitiveness (ProjectCTQ2012-30703) and of the UE (FEDER funding). |
URI: | http://hdl.handle.net/10045/40799 |
ISSN: | 0926-3373 (Print) | 1873-3883 (Online) |
DOI: | 10.1016/j.apcatb.2014.07.013 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1016/j.apcatb.2014.07.013 |
Appears in Collections: | INV - MCMA - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2015_Xavier_etal_ACB-E_final.pdf | Versión final (acceso restringido) | 1,43 MB | Adobe PDF | Open Request a copy |
2015_Xavier_etal_ACB-E.pdf | Accepted Manuscript (acceso abierto) | 1,93 MB | Adobe PDF | Open Preview |
Items in RUA are protected by copyright, with all rights reserved, unless otherwise indicated.