Rh/perovskite catalysts were prepared and evaluated in ethanol steam reforming reaction. The samples were characterized by SBET, XRD, XPS, TPR, TG and SEM techniques. It could be possible to obtain perovskites supports with high purity, stability and suitable specific surface areas. The partial substitution of La with Ca and Ce in a LaAlO₃ based perovskite structure was reached and changes in its porosity and surface features were detected. The inclusion of Ca into the structure increased specific surface area of support and Ce inclusion activated oxygen mobility on catalyst surface. The supports influenced the degree of reduction of Rh species at the surface of catalysts. All catalyst showed complete ethanol conversion on 6 h on stream. The best catalytic performance was achieved with Rh/LaAlO3 0.3% catalyst which presented the highest mean value of H₂ product distribution, low production of byproducts (CH₄ and CO) and presented an excellent long term experience performance during 24 h on stream. Rh/LaCeAlO3 0.3% presented the lowest carbon accumulation during 6 h on stream but it suffered deactivation after 14 h on stream. The deactivation was attributed to the partial oxidation of Rh° species to Rh³⁺ which are less active favoring a reaction pathway that produce carbonaceous deposits.

制备了Rh /钙钛矿催化剂，并在乙醇蒸汽重整反应中进行了评估。通过SBET，XRD，XPS，TPR，TG和SEM技术对样品进行表征。可以获得具有高纯度，稳定性和合适的比表面积的钙钛矿载体。LaAlO ₃中用Ca和Ce部分取代La达到钙钛矿结构，并检测其孔隙率和表面特征的变化。将Ca夹杂到结构中可增加载体的比表面积，而Ce夹杂物可活化催化剂表面的氧迁移率。载体影响催化剂表面Rh种类的还原程度。所有催化剂在运行6小时后显示出乙醇的完全转化。用0.3％的Rh / LaAlO3催化剂可获得最佳的催化性能，该催化剂表现出H ₂产品分布的平均值最高，副产物（CH ₄和CO），并在24小时的播放过程中展现了出色的长期体验。0.3％的Rh / LaCeAlO3在运行6 h时碳积累最低，但在运行14 h后失活。失活归因于Rh°物种被部分氧化为Rh ³⁺，后者活性较低，有利于产生碳质沉积物的反应路径。