Ni/ZnO/Al₂O₃ catalysts at different molar ratios were synthesized and characterized, and the catalytic performances were assessed by partial hydrogenation of sunflower oil. Ni:Zn at various molar ratios have resulted in varying degrees of Ni and Zn migration from the bulk to the catalyst surface, which led to different pore characteristics. Catalysts with equimolar Ni:Zn have shown wider pores and higher pore volumes and achieved 23% higher hydrogenation activity than Ni/Al₂O₃. The presence of ZnO also led to higher Ni surface area and dispersion, and TEM images have indicated that this could be attributed to ZnO that acts as a spacer for the Ni crystallites. However, the Ni surface area diminishes as the ZnO content becomes higher. The presence of ZnO in Ni/ZnO/Al₂O₃ catalysts is also shown to lower trans-fats formation when wide pores are available.

中文翻译：

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ZnO对向日葵油部分加氢共沉淀Ni / ZnO / Al ₂ O ₃催化剂的特性和选择性的影响

合成和表征了不同摩尔比的Ni / ZnO / Al ₂ O ₃催化剂，并通过向日葵油的部分加氢评价了其催化性能。不同摩尔比的Ni：Zn导致Ni和Zn从本体向催化剂表面迁移的程度不同，从而导致不同的孔特性。与Ni / Al ₂ O ₃相比，具有等摩尔Ni：Zn的催化剂显示出更宽的孔和更大的孔体积，并实现了23％的加氢活性。ZnO的存在还导致较高的Ni表面积和分散度，并且TEM图像表明，这可能归因于ZnO充当了Ni微晶的间隔物。然而，随着ZnO含量变高，Ni表面积减小。当宽孔存在时，在Ni / ZnO / Al ₂ O ₃催化剂中ZnO的存在还可以降低反式脂肪的形成。