@article{oai:ir.kagoshima-u.ac.jp:00003797,
 author = {Kai, Takami and Okada, Norihide and Baba, Manabu and Takahashi, Takeshige and Misawa, Masaki and Ion, Tiseanuc and Ichikawa, Naoki},
 issue = {2-3},
 journal = {Chemical Engineering Journal},
 month = {Jan},
 note = {In a fluidized catalyst bed, the reactant gas transfers from the bubble phase to the emulsion phase and reactions proceed in the 
emulsion phase. The catalyst particles around the bubbles should contact the gases containing a high concentration of the reactants.
Therefore, the effect of the catalysts around the bubbles is very important for estimating the conversion and selectivity in the reactor. In
order to study the role of these catalysts, the hydrogenation of carbon dioxide was carried out in a fluidized catalyst bed. Based on the 
results, the amount of the catalyst that was effective for the reaction was calculated. In addition, the shape of the bubbles ascending in the 
fluidized catalyst bed was observed using a fast X-ray computer tomography (CT) scanner. The structure of the bubbles in the fluidized 
catalyst bed was very complicated and the surface area of the bubbles was much greater than the obtained when assuming spherical 
shaped bubble. By assuming that effective catalysts existed around the bubbles, the thickness of catalyst layer was obtained. Finally, the 
3-dimensional images of the catalyst layers around the bubbles were reconstructed.},
 pages = {119--124},
 title = {Structure of effective catalyst layers around bubbles in a fluidized catalyst bed},
 volume = {130},
 year = {2007}
}