Abstract
Abstract >> In HI decomposition, Pt/Al 2 O 3 has been studied by several researchers. However, after HI decomposition,it could be seen that metal dispersion of Pt/Al 2 O 3 was greatly decreased. This reason was expected of platinumloss and sintering, which platinum was aggregated. Also, this decrease of metal dispersion caused catalytic deactivation.This study was conducted to find the condition to minimize platinum sintering and loss. In particular, heat treatmentatmosphere and temperature were examined to improve the activity of HI decomposition reaction. First of all,although Pt/Al 2 O 3 treated in hydrogen atmosphere had low platinum dispersion between 13 and 18%, it was shownto suitable platinum form that played an important role in improving HI decomposition reaction. Oxygen in the air atmosphere made Pt/Al 2 O 3 have high platinum dispersion even 61.52% at 500°C. Therefore, in order to get high platinum dispersion and suitable platinum form in HI decomposition reaction, air heat treatment at 500°Cwas needed to add before hydrogen heat treatment. In case of 5A3H, it had 51.13% platinum dispersion and improved HI decomposition reaction activity. Also, after HI decomposition reaction it had considerable platinumdispersion of 23.89%.
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