Mesoporous cobalt oxides doped with alkali (Li, Na, K, Cs) and alkaline earth (Mg, Ca) metals were synthesized and evaluated for their catalytic activity in the reduction of 4-nitrophenol. The prepared materials were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), Brunauer–Emmet–Teller (BET) and hydrogen temperature programmed reduction (H₂-TPR) analyses. The characterization techniques used showed the materials to consist of mono-dispersed nanoparticle aggregates with connected, well defined intra-particle voids and the crystalline phase of the cobalt oxide to be cubic Co₃O₄, while the pore diameters ranged from 12.1 to 19.2 nm depending on the metal ion dopant. The reduction of 4-nitrophenol was chosen as a well-controlled model reaction allowing us to determine the catalytic activity as a function of alkali or alkaline earth dopant. Calcium doped cobalt oxide was found to be the most catalytically active with an apparent rate constant of 3.76 × 10⁻³ s⁻¹ and the order with respect to dopant was Ca > Cs > Mg > Li > K > Na. From characterization of the catalysts by SEM, TEM and H₂-TPR promotion effects of the dopants were found to be due to electronic changes in the catalysts as a result of doping rather than structural changes. The kinetics of the most active calcium doped catalyst was modeled in terms of Langmuir–Hinshelwood kinetics. The Langmuir–Hinshelwood surface rate constant for Ca-doped Co₃O₄ was 5.47 × 10⁻⁵ mol m⁻² s⁻¹ compared to the undoped Co₃O₄ at 5.33 × 10⁻⁶ mol m⁻² s⁻¹. Activation energies were calculated to be 51.3 kJ mol⁻¹ and 50.7 kJ mol⁻¹ for undoped and Ca-doped Co₃O₄.

合成了掺杂有碱金属（Li，Na，K，Cs）和碱土金属（Mg，Ca）的中孔氧化钴，并评估了它们在还原4-硝基苯酚中的催化活性。使用扫描电子显微镜（SEM），透射电子显微镜（TEM），粉末X射线衍射（XRD），Brunauer–Emmet–Teller（BET）和氢程序升温还原（H ₂ -TPR）分析对制备的材料进行表征。所用的表征技术表明，该材料由单分散的纳米颗粒聚集体组成，这些聚集体具有连通的，定义明确的颗粒内空隙，并且氧化钴的结晶相为立方晶的Co ₃ O _4。，而孔径根据金属离子掺杂剂在12.1至19.2nm范围内。选择4-硝基苯酚的还原反应是一个控制良好的模型反应，使我们能够确定作为碱或碱土金属掺杂剂的函数的催化活性。发现掺杂钙的氧化钴最具催化活性，其表观速率常数为3.76×10 ^-3  s ^-1，并且相对于掺杂剂的顺序为Ca> Cs> Mg> Li> K> Na。由SEM，TEM和H ₂表征催化剂发现掺杂剂的TPR促进作用是由于掺杂而不是结构变化导致催化剂中的电子变化。用Langmuir-Hinshelwood动力学模拟了活性最高的钙掺杂催化剂的动力学。对于CA掺杂钴的朗缪尔-欣谢尔伍德表面速率常数₃ ö ₄为5.47×10 ^-5 摩尔米^-2 小号^-1相比未掺杂共₃ ö ₄在5.33×10 ^-6 摩尔米^-2 小号^-1。计算出未掺杂和掺杂Ca的Co _3的活化能为51.3 kJ mol ^-1和50.7 kJ mol ^-1O ₄。