Abstract
CO 2-reforming reactions have been studied in a plug-flow reactor with catalysts containing less than a monolayer of Rh, Ru, or Ir deposited from tetrametallic dodecacarbonyl clusters onto low surface area polycrystalline α-Al 2O 3, MgO, CeO 2, La 2O 3, and TiO 2. The catalytic reactions are studied in conditions at which the carbon formation quickly deactivates Ni-based catalysts but does not deactivate noble metal based materials. Diffuse-reflectance-infrared-Fourier-transform (DRIFT) spectroscopy and mass spectrometry experiments inside a high-temperature high-pressure (HTHP) chamber have cast light on molecular aspects of the CO 2-reforming reaction which have been embodied in a reaction mechanism. The formation of highly reactive oxidic species from the dissociation of CO 2 is showed, and their role in inhibiting the production of large carbon aggregates is discussed.
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