HWAHAK KONGHAK, Vol.28, No.6, 624-629, December, 1990
메탄처리에 의한 알루미나 담지 백금 촉매의 활성화
Activation of an Alumina-Supported Platinum Catalysts by Methane Treatment
초록
알루미나 담지 백금 촉매를 1% CH4-N2 기체로 573 K, 673 K 및 723 K에서 처리하였을 때의 촉매활성화에 대하여 조사하였다. 처리하는 동안 유출기체의 성분을 분석한 결과 H2와 CO2 발생이 관찰되었다. 673 K에서 메탄처리한 촉매의 H2 및 O2 흡착량이 가장 높았으며, 수소처리한 촉매의 흡착량의 65%에 달했다. 573 K에서는 촉매중의 산소가 별로 제거되지 않았고, 723 K에서는 탄소퇴적이 많이 일어나서 흡착량이 작은 것으로 생각된다. 673 K에서 메탄처리한 촉매와 수소처리한 촉매에 대하여 시클로프로판 수소 첨가반응을 273 K, 상온, 328 K에서 수행하였는데, 비활성화속도는 온도가 높을수록 증가하였으며, 메탄처리한 촉매는 수소처리한 촉매와 비활성화 양상이 크게 다르지는 않았다.
Activation of an alumina-supported platinum catalyst by methane treatment was investigated. The treating gas contained 1% CH4 in N2 and the treatment temperatures were 573, 673, and 723K. The effluent gas was analyzed during the treatment and the evolution of H2 and CO2 was observed. The amounts of chemisorbed H2 and O2 were the largest on the catalyst treated at 673K, and they amounted to 65% of the amounts chemisorbed on the hydrogen-treated catalyst. It is considered that at 573K the oxygen in the catalyst was not removed sufficiently and that at 723K a large amount of carbon deposit was built up. Hydrogenation of cyclopropane was carried out at 273K, room temperature, and 328K over both the catalyst treated with methane at 673K and the catalyst treated with hydrogen. The deactivation rate increased with increasing temperature, and the deactivation pattern of the methane-treated catalyst did not appear to be different from that of the hydrogen-treated catalyst.
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