Ruthenium catalysts anchored on three distinct supports (γ-Al₂O₃, γ-χ-Al₂O₃, and silica [SiO₂]) are tested for ethanol dehydration at 250°C. The catalytic materials were characterized using X-ray diffraction (XRD), N₂ physisorption, ammonia temperature programmed desorption (NH₃-TPD), FTIR, UV-Vis spectroscopy, in situ UV-Vis spectroscopy, H₂ temperature programmed reduction experiments (H₂-TPR), and thermogravimetric analysis (TGA) after reaction. The activity was correlated to the number of acid sites present in the support. However, the addition of Ru increased the activity for alumina supported catalysts. Product selectivity depends on the nature of the acid sites present on the catalytic material, with ruthenium playing a critical role on the acid properties of the catalysts.

中文翻译：

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钌对混合氧化铝和二氧化硅相酸度的作用及其对乙醇脱水活性的影响

_{测试锚定在三种不同载体（γ-Al 2} O ₃、γ-χ-Al ₂ O ₃和二氧化硅 [SiO ₂ ]）上的钌催化剂在 250°C 下的乙醇脱水。采用X射线衍射(XRD)、N ₂物理吸附、氨程序升温脱附(NH ₃ -TPD)、FTIR、UV-Vis光谱、原位UV-Vis光谱、H ₂程序升温还原实验对催化材料进行了表征( H ₂-TPR) 和反应后的热重分析 (TGA)。该活性与载体中存在的酸性位点的数量相关。然而，Ru 的添加提高了氧化铝负载型催化剂的活性。产物选择性取决于催化材料上存在的酸位的性质，钌对催化剂的酸性质起着关键作用。