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• W2433197097 abstract "매체 순환식 수소제조공정은 직접 고순도의 수소를 생산하는 동시에 <TEX>$CO_2$</TEX> 포집 비용을 최소화할 수 있는 고효율/친환경적인 공정이다. 본 공정은 레독스 반응을 통하여 산소를 전달하고 이때 철 산화물계 산소전달입자를 이용하게 된다. 구리 산화물이 첨가된 철-구리 산화물계 산소전달입자는 반응성 향상이 보고되어 왔으나 철 산화물과 구리 산화물 간 상호작용에 대한 이해가 부족한 실정이다. 본 연구에서는 여러 기기 분석법(SEM/EDX, XRD, BET, TPR, XPS, TGA)을 통하여 철-구리 산화물계 산소전달입자의 레독스 반응성 향상을 지배하는 주요인을 연구하였다. 첨가된 구리 산화물은 철 산화물 성장 억제제 역할 뿐만 아니라 화학적 환경 변화를 일으키는 화학적 촉매제(chemical promoter) 역할도 하는 것이 발견되었다. 철-구리 산화물계 산소전달입자의 우수한 환원 반응성은 구리 산화물의 도입으로 <TEX>$Fe^{2+}$</TEX> 농도 증가 및 표면 특성 변화 때문이며, 우수한 물분해 특성은 산화 과정에서 일어나는 철 산화물의 응집을 구리 산화물이 억제시킨 것으로 판단되었다. <TEX>$H_2$</TEX> production by chemical looping is an efficient method to convert hydrocarbon fuel into hydrogen with the simultaneous capture of concentrated <TEX>$CO_2$</TEX>. This process involves the use of an iron based oxygen carrier that transfers pure oxygen from oxidizing gases to fuels by alternating reduction and oxidation (redox) reactions. The enhanced reactivities of copper oxide doped iron-based oxygen carrier were reported, however, the fundamental understandings on the interaction between <TEX>$Fe_2O_3$</TEX> and CuO are still lacking. In this study, we studied the effect of dopant of CuO to <TEX>$Fe_2O_3/ZrO_2$</TEX> particle on the morphological changes and the associated reactivity using various methods such as SEM/EDX, XRD, BET, TPR, XPS, and TGA. It was found that copper oxide acted as a chemical promoter that change chemical environment in the iron based oxygen carrier as well as a structural promoter which inhibit the agglomeration. The enhanced reduction reactivity was mainly ascribed to the increase in concentration of <TEX>$Fe^{2+}$</TEX> on the surface, resulting in formation of charge imbalance and oxygen vacancies. The CuO doped <TEX>$Fe_2O_3/ZrO_2$</TEX> particle also showed the improved reactivity in the steam oxidation compared to <TEX>$Fe_2O_3/ZrO_2$</TEX> particle probably due to acting as a structural promoter inhibiting the agglomeration of iron species." @default.
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• W2433197097 date "2016-06-01" @default.
• W2433197097 modified "2023-10-15" @default.
• W2433197097 title "The Effect of addition of CuO to Fe2O3/ZrO2Oxygen Carrier for Hydrogen Production by Chemical Looping" @default.
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• W2433197097 doi "https://doi.org/10.9713/kcer.2016.54.3.394" @default.
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