Investigations on the properties of ceria–zirconia-supported Ni and Rh catalysts and their performance in acetic acid steam reforming
Investigations on the properties of ceria–zirconia-supported Ni and Rh catalysts and their performance in acetic acid steam reforming
复制标题
DOI：
10.1016/j.jcat.2009.11.024
复制
发表时间：
2010-02
影响因子：
7.3
通讯作者：
E. C. Vagia;A. Lemonidou
中科院分区：
文献类型：
--
作者：
E. C. Vagia;A. Lemonidou
研究了在CeO_2-ZrO_2复合氧化物负载Ni和Rh催化剂上乙酸水蒸气重整制氢的反应。在550-650-750°C下使用蒸汽/碳=3测试催化剂。蒸汽重整、水煤气变换和脱羧是仅在载体上发生的主要反应。同时，脱氢导致在混合氧化物的表面上形成碳沉积物。金属的添加使得重整反应能够以高速率进行，产生甚至在650°C下接近热力学平衡的氢气产率。氧交换反应增强，导致低得多的焦炭沉积。金属的性质不仅影响碳沉积物的数量，而且影响碳沉积物的质量和位置，这一点从程序升温氧化试验中得到了证明。载体和金属的协同作用是低焦炭沉积的关键因素，这对于Rh催化剂甚至更低。
The production of hydrogen via steam reforming of acetic acid was examined over Ni and Rh supported on a CeO2–ZrO2-mixed oxide. The catalysts were tested at 550–650–750°C using steam/carbon=3. Steam reforming, water gas shift, and decarboxylation are the main reactions taking place over the support alone. In parallel, dehydrogenation leads to the formation of carbon deposits on the surface of the mixed oxide. The addition of the metals enables the reforming reactions to proceed with high rates producing hydrogen yields close to thermodynamic equilibrium even at 650°C. The oxygen exchange reactions are enhanced leading to much lower coke deposition. The nature of the metal affects not only the quantity but also the quality and the location of the carbon deposits, as evidenced from temperature-programing oxidation tests. The synergy of the support and metal is the key factor for the low coke deposition, which is even lower for the Rh catalyst.