Combined CO/CH4 oxidation tests over Pd/Co3O4 monolitic catalyst: effects of high reaction temperature and SO2 exposure on the deactivation process
| Autor: | Giulio Deganello, Leonarda F. Liotta, G. Di Carlo, Giuseppe Pantaleo, Anna Maria Venezia, M. Pidria, E. Merlone Borla |
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| Rok vydání: | 2007 |
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| Zdroj: | Applied catalysis. B, Environmental 75 (2007): 182–188. info:cnr-pdr/source/autori:L.F. Liotta, G. Di Carlo, G. Pantaleo, A.M.Venezia, G. Deganello, E. Merlone Borla, M. Pidria/titolo:Combined CO%2FCH4 oxidation tests over Pd%2FCo3O4 monolitic catalyst: effects of high reaction temperature and SO2 exposure on the deactivation process/doi:/rivista:Applied catalysis. B, Environmental (Print)/anno:2007/pagina_da:182/pagina_a:188/intervallo_pagine:182–188/volume:75 |
| Popis: | CO and CH 4 combined oxidation tests were performed over a Pd (70 g/ft 3 )/Co 3 O 4 monolithic catalyst in conditions of GHSV = 100,000 h −1 and feed composition close to that of emission from bi-fuel vehicles. The effect of SO 2 (5 ppm) on CO and CH 4 oxidation activity under lean condition ( λ = 2) was investigated. The presence of sulphur strongly deactivated the catalyst towards methane oxidation, while the poisoning effect was less drastic in the oxidation of CO. Saturation of the Pd/Co 3 O 4 catalytic sites via chemisorbed SO 3 and/or sulphates occurred upon exposure to SO 2 . A treatment of regeneration to remove sulphate species was attempted by performing a heating/cooling cycle up to 900 °C in oxidizing atmosphere. Decomposition of PdO and Co 3 O 4 phases at high temperature, above 750 °C, was observed. Moreover, sintering of Pd 0 and PdO particles along with of CoO crystallites takes place. |
| Databáze: | OpenAIRE |
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