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- In relation to this article, we declare that there is no conflict of interest.
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Received September 5, 2016
Accepted November 23, 2016
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Pd 촉매상에서 일산화탄소 존재 하 수소의 선택적 산화반응: 담체 효과
Selective Oxidation of Hydrogen Over Palladium Catalysts in the Presence of Carbon Monoxide: Effect of Supports
충북대학교 화학공학과, 28644 충청북도 청주시 서원구 충대로 1
Department of Chemical Engineering, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju, Chungbuk, 28644, Korea
chshin@chungbuk.ac.kr
Korean Chemical Engineering Research, February 2017, 55(1), 121-129(9), 10.9713/kcer.2017.55.1.121 Epub 2 February 2017
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Abstract
TiO2, Al2O3, ZrO2, SiO2와 같은 다양한 담체에 습식함침법을 이용하여 Pd 기반 촉매를 제조하여 일산화탄소 존재하에 수소의 선택적 산화반응에 적용하였다. 제조된 촉매는 물리화학적 특성을 알아보기 위하여 XRD, N2 흡착, CO-, (CO+H2O)-TPD, CO-TPR, XPS등의 특성분석을 수행하였다. CO-TPD와 (CO+H2O)-TPD를 통해 CO2탈착에 대한 H2O의 영향을 알아보았으며 이러한 TPD 결과는 H2/CO 전환율과 상관관계가 있음을 확인하였다. 사용된 촉매 중에서 Pd/ZrO2 가 H2 전환율 측면에서 가장 활성이 좋은 것으로 나타났다. H2O가 첨가된 선택적 H2 산화반응에서는 H2O, CO, H2가 경쟁흡착을 하였으며, 첨가된 H2O가 CO 및 H2의 반응을 촉진시켰다.
Pd based catalysts were prepared by impregnating palladium precursor using incipient wetness method on TiO2, Al2O3, ZrO2, and SiO2 and were applied for the selective oxidation of H2 in the presence of CO. Their physicochemical properties were studied by X-ray diffraction (XRD), N2-sorption, temperature programmed desorption of CO (CO-TPD) and (CO+H2O)-TPD, temperature programmed reduction of CO (CO-TPR) and XPS a. The results of COand (CO+H2O)-TPD showed the correlation between peak temperature of TPD and catalytic activities for H2 and CO conversion. The Pd/ZrO2 catalyst exhibited the highest conversion of H2. The addition of H2O vapor promotes the conversion of H2 and CO by inducing easy desorption of CO and H2 in the competitive adsorption of H2O, CO and H2.
Keywords
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