Advanced CNG (compressed natural gas) engines entail considerable advantages over conventional gasoline and diesel engines. It produces less CO2 (carbon dioxide) per unit of energy released. Soot particulate can hardly be formed from methane combustion. However, unconverted methane in CNG flue gases is much harder to oxidise than gasoline derived unburned hydrocarbons. The strong greenhouse effect of methane forces a higher and higher concern at a legislation level and, as a consequence, the development of new after-treatment technologies to abate these emissions. Catalytic combustion of methane on honeycomb converters similar to those used for the treatment of gasoline engine exhaust gases is the way to go. A research line of ours is aimed at developing nanostructured perovskite-type-oxide catalysts employing an overall noble metal load significantly smaller than that used in conventional converters with the catalytic performance being the same. Several perovskite-type oxide catalysts were prepared, characterised, and tested as catalysts for methane combustion. The comparative analysis of the catalysts activity was carried out. The best catalyst was found and tested in a lab-scale test rig under realistic conditions. Half methane conversion was achieved with a six-fold lower amount of the expensive noble metal than that used in commercial catalysts.
Pd-perovskite catalysts for methane emissions abatement: Study of Pd substitution effects
2008
10 Seiten, 7 Bilder, 1 Tabelle, 18 Quellen
Aufsatz (Konferenz)
Englisch
British Library Conference Proceedings | 2008
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