Ni/CeO2-ZrO2 금속모노리스 촉매체를 이용한 수증기개질 반응 = Methane steam reforming over Ni/CeO2-ZrO2 monoliths catalysts

다국어 초록 (Multilingual Abstract)

The steam reforming of methane to produce hydrogen as an energy source over 10 wt% Ni/CeO2-ZrO2 catalyst on the alumina-coated honeycomb monoliths was carried out. Among the catalysts having different Ce/Zr ratio, the catalyst Ni/CeO2-ZrO2 (Ce/Zr=4/1) showed the highest methane conversion at 700~800℃. It is confirmed that 10 wt% Ni/CeO2-ZrO2catalyst loaded on the alumina-coated honeycomb monoliths has a better catalytic performance than powder type catalyst due to higher thermal conductivity and large specific contact area of the monolith. In addition, the catalyst Ni/CeO2-ZrO2 (Ce/Zr=4/1) loaded on the alumina-coated honeycomb has a strong resistance at high hydrogen appearance caused by excess steam in the feed. Compared to the powder form of Ni/CeO2-ZrO2, the catalyst loaded on honeycomb structure showed much higher methane conversion (>98%) at the condition of GHSV=30,000h-1, feed ratio H2O/CH4=3.0 and reaction temperature 800℃. The ratio of CO2/CO in the productincreases with the increased ratio of steam/methane due to forward water-gas shift reaction promoted by excess steam in reactant.
Key words: monolith catalyst; steam reforming; Ni/CeO2-ZrO2

목차 (Table of Contents)

• Ⅰ. 서론 1
• Ⅱ. 이론적 배경 4
• 2.1 연료 개질기 4
• 2.2 연료 개질 기술 4
• 2.2.1 수증기 개질 (Steam Reforming) 5
• 2.2.2 부분산화 개질 (Partial Oxidation Reforming) 8
• 2.2.3 자열 개질 (Autothermal Reforming) 8
• 2.2.4. 수성가스 반응과 선택적 산화 반응 9
• 2.3 연료 개질기 개발 현황 10
• Ⅲ. 실험 12
• 3.1. 촉매 제조 12
• 3.2. 금속 지지체 12
• 3.3. 실험장치 16
• 3.4. 분석 16
• Ⅳ. 실험 결과 18
• 4.1 담체의 영향 (powder) 22
• 4.2 담체의 영향 (monoliths) 33
• 4.3 반응물 비의 영향 39
• 4.4 유량의 영향 42
• Ⅴ. 결론 45
• 참고문헌 46