The role and the preferred form of CO₂ adsorption in the oxidative dehydrogenation of ethylbenzene to styrene on a CoFe₂O₄–MCM-41 surface were investigated. It was observed from XRD, Mossbauer and magnetic results that the cobalt ferrite was maintained when the reaction was performed in the presence of CO₂ and it was reduced in tests carried out in the absence of CO₂, showing that CO₂ has the role of regenerating the lattice oxygen and iron species of spinel, consuming H₂ through the reverse water–gas-shift reaction. Thermogravimetric analyses showed that the reaction in the presence of CO₂ deposited less coke compared to the test in the absence of CO₂, confirming the role of CO₂ in oxidation of deposited carbon through gasification of coke and the Boudouard reaction. The proposed mechanism shows that adsorption of CO₂ occurs preferentially at the O²⁻–Fe³⁺–O²⁻ octahedral sites as bicarbonate, according to TPD-CO₂ and FTIR-CO₂ results, where C from carbon dioxide interacts with lattice oxygen (O²⁻) and the oxygen from CO₂ interacts with the acid site (Fe³⁺). The formation of a bridged bicarbonate structure on the ferrite surface occurs through a proton transfer and an intermolecular process involving the coadsorption of hydroxyl and/or carbonate groups.

研究了在 CoFe ₂ O ₄ –MCM-41 表面上的乙苯氧化脱氢成苯乙烯中 CO ₂吸附的作用和优选形式。它是从XRD，穆斯堡尔和磁性的结果观察到，当在CO的存在下进行该反应的钴铁氧体保持₂，它是在不存在CO的情况下进行试验减少₂，示出了CO ₂具有的作用再生尖晶石的晶格氧和铁物种，通过反向水煤气变换反应消耗 H ₂。热重分析表明，CO ₂存在下的反应与不存在 CO ₂的测试相比，沉积的焦炭更少，证实了 CO ₂在通过焦炭气化和 Boudouard 反应氧化沉积碳中的作用。根据 TPD-CO ₂和 FTIR-CO ₂结果，所提出的机制表明 CO _{2 的}吸附优先发生在 O ²⁻ –Fe ³⁺ –O ²⁻八面体位点作为碳酸氢盐，其中来自二氧化碳的 C 与晶格相互作用氧 (O ²⁻ ) 和来自 CO ₂的氧与酸位点 (Fe ³⁺）。在铁氧体表面形成桥连碳酸氢盐结构是通过质子转移和涉及羟基和/或碳酸酯基团共吸附的分子间过程发生的。