Dielectric heating effects on the activity and SO2 resistance of La0.8Ce0.2MnO3 perovskite for methane oxidation

Abstract

Dielectric heating effects on the activity and SO2 resistance of La0.8Ce0.2MnO3 perovskite for methane oxidation Zhang, Y.; Castricum, H.L.; Beckers, J.; Eiser, E.; Bliek, A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. under dielectric and conventional heating conditions. As these materials are both microwave sensitive and catalytically active, they may be applied as coating material for ceramic soot filters for the reduction of soot emission from Diesel engines. Dielectric heating is shown to result in a much higher CH 4 conversion and a higher resistance to SO 2 poisoning. We propose that local hot spots on the catalytic surface explain the increased activity toward CH 4 conversion. The catalytic activity in SO 2 is largely maintained, as pore blockage by sulphates, as experienced in conventional heating, is counteracted.

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

“…By contrast, the adsorbed SO2 can react with oxygen forming surface sulphites or sulphates, which are stable below their decomposition temperature. Once formed, the reaction can go on in depth following a shell-progressive pathway as discussed elsewhere [1,22].…”

Selective Hydrogen Oxidation in the Presence of C3 Hydrocarbons Using Perovskite Oxygen Reservoirs

“…[7,14,17] One elegant application is using perovskites as diesel exhaust soot filters. [18,19] By coating a low-loss ceramic monolith with a microwave-susceptible perovskite catalyst, fast and efficient heating is achieved, since all the energy is supplied where it is needed, that is, on the combustion catalyst itself. [20][21][22][23] Perovskite-type oxides, ABO 3 , can be successfully applied as solid "oxygen reservoirs" in redox reactions such as selective hydrogen combustion.…”

Clean Diesel Power via Microwave Susceptible Oxidation Catalysts

“…Our group recently showed that La 0.8 Ce 0.2 MnO 3 can catalyze the combustion of methane, CO, and synthetic soot using mw irradiation, with a high selectivity towards CO 2 . [9,21,22] The results obtained with the La 0.8 Ce 0.2 MnO 3 catalysts, and our recent success with doped ceria catalysts [23] prompted the search for a mixed perovskite that would combine high oxidation activity and selectivity, high SO 2 tolerance, and high mw susceptibility. In a recent preliminary communication, we demonstrated the feasibility of this approach.…”