CO oxidation over CuOx-CeO2-ZrO2 catalysts: Transient behaviour and role of copper clusters in contact with ceria |
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| Affiliation: | 1. Dipartimento di Chimica I.F.M., Università di Torino, Via P. Giuria 7, 10125 Torino, Italy;2. Dipartimento di Scienze Chimiche, Università di Trieste, Via Giorgieri 1, 34127 Trieste, Italy;3. INCA—Interuniversity Consortium Chemistry for the Environment, Sections Universities of Turin and Trieste, Trieste, Italy;1. Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Turin, Italy;2. Center for Sustainable Future Technologies, Istituto Italiano di Tecnologia, Via Livorno, 60, 10144 Turin, Italy;1. School of Environment and Energy, South China University of Technology, Guangzhou, 510640, China;2. College of Light Chemical Industry and Materials Engineering, Shunde Polytechnic, Foshan, 528333, China;3. National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou, 510640, China;1. Boreskov Institute of Catalysis, Pr. Lavrentieva 5, 630090 Novosibirsk, Russia;2. Novosibirsk State University, St. Pirogova 2, 630090 Novosibirsk, Russia;3. St. Petersburg State University, 7-9, Universitetskaya nab., 198504 St. Petersburg, Russia;4. Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany |
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| Abstract: | The effects of ZrO2 content on the CO oxidation activity in a series of CuOx/CexZr1−xO2 (x = 0, 0.15, 0.5, 0.7 and 1) catalysts were investigated, both in the absence and in the presence of H2, i.e. preferential CO oxidation—PROX. The investigation was performed under light-off conditions to focus the effects of transients and shut-down/start-up cycles on the performance; such phenomena are expected to affect the activity of PROX catalysts in small/delocalised fuel reformers. Evidence has been obtained for a transition from an “oxidized” towards a “reduced” state of the catalyst under the simulated PROX reaction conditions as a function of the reaction temperature, leading to different active species under the reaction conditions. Both CO oxidation activity and PROX selectivity appear to be affected by this process. IR characterisation of the surface copper species suggests an important role of reduced cerium sites in close contact with copper clusters on the CO oxidation activity at low temperatures. |
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