NOX reduction over paper-structured fiber composites impregnated with Pt/Al2O3 catalyst for exhaust gas purification
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Pt/Al2O3 catalyst powder was successfully incorporated in a microstructured paper-like matrix composed of a ceramic fiber network, by use of a simple papermaking technique. As-prepared composite, denoted paper-structured catalyst, was applied to the reduction of nitrogen oxide (NOX) in the presence of propene, for exhaust gas purification. The paper-structured catalyst demonstrated higher NOX reduction efficiency and more rapid thermal responsiveness than a conventional Pt-loaded honeycomb catalyst, indicating that the paper-like structure with interconnected pore spaces contributes to effective transport of heat and reactants to the catalyst surfaces. Furthermore, the paper-structured catalyst with the appearance of flexible paperboard has a high degree of utility. The efficiency of utilization of Pt catalyst was improved by using hierarchically assembled paper-structured catalysts with preferential location of Pt catalyst in the upper part. The paper-structured catalyst composite with paper-like utility and porous microstructure is thought to be a promising catalytic material for efficient NOX gas purification.
This research was supported by a Research Fellowship for Young Scientists from the Japan Society for the Promotion of Science (H. K.) and by a Risk-Taking Fund for Technology Development from the Japan Science and Technology Agency (T. K.).