Abstract
CuAlCe oxides were obtained from hydrotalcite-type precursors by coprecipitation using a M2+/M3+ ratio of 3. The collapse of the layered double hydroxide structure following the thermal treatment leads to the formation of mixed oxides (CuO and CeO2). The catalytic performance of the copper-based catalysts was evaluated in the total oxidation of two Volatile Organic Compounds (VOCs): ethanol and toluene. XRD, SEM Energy-Dispersive X-ray Spectrometry (EDX), H2-temperature programmed reduction (TPR) and XPS were used to characterize the physicochemical properties of the catalysts. A beneficial effect of combining cerium with CuAl-O oxides in terms of redox properties and the abatement of the mentioned VOCs was demonstrated. The sample with the highest content of Ce showed the best catalytic properties, which were mainly related to the improvement of the reducibility of the copper species and their good dispersion on the surface. The presence of a synergetic effect between the copper and cerium elements was also highlighted.
Highlights
IntroductionIn the last few decades, extensive efforts have been focused on searching for methods of Volatile
In the last few decades, extensive efforts have been focused on searching for methods of VolatileOrganic Compound (VOC) abatement
01-081-0792), which can be explained by the partial oxidation of Ce3+ cations to Ce4+ during the synthesis [27]
Summary
In the last few decades, extensive efforts have been focused on searching for methods of Volatile. VOCs produce ozone, which contributes to the formation of smog and global warming. The emission of these pollutants in the atmosphere is today, strictly regulated. One of the most promising technologies is catalytic total oxidation, which represents an environmentally friendly control technology [1,2]. Studies of VOCs’ catalytic oxidation have been widely reported [3,4,5,6]. Low temperatures (generally around 250–500 ◦ C) are required compared to thermal oxidation, which requires high temperatures (650–1100 ◦ C). VOC oxidation has been carried out over noble metal and transition metal catalysts
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