Applied Chemistry for Engineering, Vol.24, No.5, 507-512, October, 2013
마이크로파 공정으로 제조된 LaMnO3 페롭스카이트형 촉매에서 벤젠의 연소반응
Combustion Characteristics of Benzene over LaMnO3 Perovskite-type Catalysts Prepared Using Microwave-assisted Process
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초록
페롭스카이트형 산화물을 마이크로파 공정으로 합성하여 XRD, XPS, BET 및 H2-TPR 등에 의해 특성분석을 하였고, 벤젠의 연소반응에서의 활성을 조사하였다. 대부분의 촉매들은 페롭스카이트 결정구조를 잘 가지고 있었으며 21 nm에서 35 nm의 크기를 나타내었다. LaMnO3 촉매가 가장 높은 활성을 보여주었고 250 ℃에서 거의 100%의 전환율을 나타내었으며, 마이크로파 공정으로 제조한 촉매가 기존의 졸-겔법으로 제조한 촉매에 비해 높은 활성을 보여주었다. 또한 소성온도가 증가함에 따라 연소반응의 활성이 증가하였다. 모든 촉매들의 산화환원 성질을 측정한 수소 승온환원 실험 결과는 벤젠의 연소반응의 순서와 잘 일치하였다.
Perovskite-type oxides were successfully prepared using microwave-assisted process, and by XRD, XPS, BET, and H2-TPR. Their catalytic activities for the combustion of benzene were also examined. Most of catalysts studied showed the perovskite crystalline phase with the particle size of 21∼35 nm. The LaMnO3 catalyst showed the highest activity and the conversion reached almost 100% at 250 ℃. The catalysts prepared by microwave-assisted process showed higher activity compared to those prepared sol-gel method. In addition, the catalytic activity was increased with an increase of calcination temperature of LaMnO3-type catalyst. The TPR results on the measurement of redox property showed a good correlation with the order of catalytic activity on the benzene combustion reaction.
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