The effect of modifying additives (Ni, La, Ce oxides) on the activity of Cu/Al₂O₃ with a low copper loading was studied for ethanol non-oxidative dehydrogenation. The catalysts were prepared by impregnation of the commercial Al₂O₃ granules and characterized by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), temperature-programmed desorption of NH₃ (TPD-NH₃), temperature-programmed reduction of H₂ (H₂-TPR), and thermogravimetric analysis (TGA). Modification of Cu/Al₂O₃ with Ni, La, and Ce oxides results in increasing catalytic activity. A modification of the Cu/Al₂O₃ catalyst with nickel and lanthanum oxides, in contrast to cerium oxide, leads to an improvement in the dispersion of the catalyst particles. The Cu-Ni/Al₂O₃ catalyst with the highest acidity has the highest selectivity for acetaldehyde. The highest selectivity for butanol is observed for the Cu-La/Al₂O₃ catalyst, which has the lowest acidity.

中文翻译：

---

Ni、La和Ce氧化物对低铜载量Cu/Al2O3催化剂乙醇非氧化脱氢的影响

针对乙醇非氧化脱氢，研究了改性添加剂（Ni、La、Ce 氧化物）对低铜负载量的 Cu/Al ₂ O ₃活性的影响。催化剂通过浸渍商用 Al ₂ O ₃颗粒制备，并通过 Brunauer-Emmett-Teller (BET)、扫描电子显微镜 (SEM)、NH ₃程序升温脱附(TPD-NH ₃ )、程序升温表征H ₂ (H ₂ -TPR) 的还原和热重分析 (TGA)。用 Ni、La 和 Ce 氧化物改性 Cu/Al ₂ O ₃导致催化活性增加。Cu/Al 的改性与氧化铈相比，具有氧化镍和氧化镧的₂ O ₃催化剂导致催化剂颗粒分散的改进。酸性最高的Cu-Ni/Al ₂ O ₃催化剂对乙醛的选择性最高。对于酸度最低的 Cu-La/Al ₂ O ₃催化剂，观察到对丁醇的最高选择性。