Cobalt oxide nanoparticles (6 nm) supported both inside and outside of hollow carbon spheres (HCSs) were synthesized by using two different polymer templates. The oxidation of benzyl alcohol was used as a model reaction to evaluate the catalysts. PXRD studies indicated that the Co oxidation state varied for the different catalysts due to reduction of the Co by the carbon, and a metal oxidation step prior to the benzyl alcohol oxidation enhanced the catalytic activity. The metal loading influenced the catalytic efficiency, and the activity decreased with increasing metal loading, possibly due to pore filling effects. The catalysts showed similar activity and selectivity (to benzaldehyde) whether placed inside or outside the HCS (63 % selectivity at 50 % conversion). No poisoning was observed due to product build up in the HCS.

中文翻译：

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使用内外空心碳球负载的氧化钴氧化苄醇

使用两种不同的聚合物模板合成了负载在中空碳球 (HCS) 内部和外部的氧化钴纳米粒子 (6 nm)。苯甲醇的氧化被用作评估催化剂的模型反应。PXRD 研究表明，由于 Co 被碳还原，不同催化剂的 Co 氧化态会发生变化，并且在苯甲醇氧化之前的金属氧化步骤提高了催化活性。金属负载量影响催化效率，活性随着金属负载量的增加而降低，可能是由于孔填充效应。无论放置在 HCS 内部还是外部，催化剂都显示出相似的活性和选择性（对苯甲醛）（在 50% 转化率下为 63% 选择性）。没有观察到由于 HCS 中积聚产物而引起的中毒。