CeO₂ nanoshapes, cubes with dominant (1 0 0) facets and octahedra with dominant (1 1 1) facets, were synthesized to investigate the influence of surface structure on acid-base properties. An optimization of calcination temperatures, coupled with Raman and TEM, was employed to minimize the intrinsic (Frenkel-type) defect sites and their potential complications on the facet studies involved in this work. The acid-base properties of these CeO₂ nanoshapes were characterized with in situ pyridine and CO₂ adsorption using infrared spectroscopy and quantified using pyridine, ammonia, and CO₂ temperature-programmed desorption (TPD). The (1 0 0) facet displayed weaker acid sites with lower site density than the (1 1 1) facet which had a similar density of base sites but those on the (1 0 0) facet were stronger. A strong correlation was observed between 2-propanol conversion and each facet’s acid-base properties. CeO₂ cubes exhibited greater base-site catalyzed dehydrogenation to acetone while the more acidic CeO₂ octahedra were more active in dehydration to propene.

合成了CeO ₂纳米形状、具有主要 (1  0  0) 面的立方体和具有主要 (1  1  1) 面的八面体，以研究表面结构对酸碱性质的影响。煅烧温度的优化，加上拉曼和 TEM，被用来最大限度地减少固有（弗伦克尔型）缺陷位点及其在这项工作中涉及的小平面研究中的潜在并发症。这些CeO ₂纳米形状的酸碱性质使用红外光谱通过原位吡啶和CO ₂吸附进行表征，并使用吡啶、氨和CO _{2 程序}升温脱附(TPD)进行量化。(1  0 0) 面显示出较弱的酸性位点，其位点密度低于 (1  1  1) 面，后者具有相似的碱基位点密度，但 (1  0  0)面上的酸性位点更强。在 2-丙醇转化率和每个方面的酸碱特性之间观察到很强的相关性。CeO ₂立方体表现出更大的碱位催化脱氢生成丙酮，而酸性更强的CeO ₂八面体在脱水生成丙烯方面更活跃。