Background: The production of hydrogen from catalytic reforming ethanol has attracted wide attention, which provides a promising way to replace fossil fuels with sustainable energy carriers.

Methods: In this work, the Ce1-xLaxO2-δ solid solution (CL) supported Rh catalysts (nRh/CL, n = 0.5, 1 and 2 wt.%) were prepared by a traditional impregnation method with a variation of Rh loading. The different interface structure of nRh/CL catalysts and their catalytic performance in oxidative steam reforming (OSR) reaction were investigated.

Results: Rh was loaded by the traditional impregnation method, and ethanol conversion and H2 yield declined in the order of 1%Rh/CL > 2%Rh/CL > 0.5%Rh/CL.

Conclusion: The supports of the nRh/CL catalysts were confirmed to be Ce1-xLaxO2-δ solid solution, but only for the 1%Rh/CL catalyst, the Rh species were well-dispersed on the support and formed a Rh2O3//Ce1-xLaxO2-δ interface structure. The super-cell structure of Rh3+-O-RE3/4+ (RE = Ce, La) on the surface of 0.5%Rh/CL catalyst and the formation of interfacial Ce1-x-yLaxRhyO2-δ solid solution for 2%Rh/CL catalyst had effects on the self-activation of the nRh/CL catalysts. The typical lattice expansion of Ce1-xLaxO2-δ solid solution lowered the energy for migration. And the excellent hydrogen and oxygen mobility at the Rh//Ce1-xLaxO2-δ interface for 1%Rh/CL catalyst guaranteed the good catalytic performance for OSR at low temperature.

背景：由催化重整乙醇生产氢已引起广泛关注，这为用可持续的能源载体替代化石燃料提供了一种有希望的方法。

方法：在这项工作中，通过传统的浸渍方法，随Rh负载的变化，制备了Ce1-xLaxO2-δ固溶体（CL）负载的Rh催化剂（nRh / CL，n = 0.5、1和2 wt。％）。研究了nRh / CL催化剂的不同界面结构及其在氧化蒸汽重整（OSR）反应中的催化性能。

结果：Rh采用传统浸渍法加载，乙醇转化率和H2收率依次下降，为1％Rh / CL> 2％Rh / CL> 0.5％Rh / CL。

结论：nRh / CL催化剂的载体被确认为Ce1-xLaxO2-δ固溶体，但仅对于1％Rh / CL催化剂，Rh物种良好地分散在载体上并形成Rh2O3 // Ce1 -xLaxO2-δ接口结构。0.5％Rh / CL催化剂表面的Rh3 + -O-RE3 / 4 +（RE = Ce，La）的超孔结构和2％Rh /的界面Ce1-x-yLaxRhyO2-δ固溶体的形成CL催化剂对nRh / CL催化剂的自活化有影响。Ce1-xLaxO2-δ固溶体的典型晶格膨胀降低了迁移能。1％Rh / CL催化剂在Rh //Ce1-xLaxO2-δ界面处优异的氢和氧迁移率确保了低温下OSR的良好催化性能。