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Charge Dependent Catalytic Activity of Gasborne Nanoparticles

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It is shown experimentally that the electric charge of unsupported catalyst particles has a major influence on the methanation of CO with nano-sized Ni particles as catalyst at temperatures between 680 K and 720 K. Neutral particles showed an apparent activation energy of 148 kJ/mol, significantly higher than the apparent activation energies of 43 kJ/mol and 60 kJ/mol for negatively and positively charged particles, respectively. The obtained activation energies are comparable to energies obtained for different sites on alumina supported nickel catalysts. The change in activation energy can be qualitatively explained by different electron interchange between the chemisorbed species and the catalyst. We suggest that the observed effect of electron enhancement or depletion on catalysis is also a governing effect in strong metal support interaction (SMSI), where the displacement of electrons is related to the contact potential between catalyst and substrate.
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Keywords: AEROSOL CATALYSIS; METHANATION; NICKEL; SPARK DISCHARGE GENERATOR

Document Type: Research Article

Publication date: 2011-10-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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