The CoAlCeO Mixed Oxide: An Alternative to Palladium-Based Catalysts for Total Oxidation of Industrial VOCs

Abstract

Catalytic total oxidation is an effective technique for the treatment of industrial VOCs principally resulting from industrial processes using solvents, and usually containing mono-aromatics (BTEX) and oxygenated compounds (acetone, ethanol, butanone). The catalytic total oxidation of VOCs on noble metal materials is effective. However, the cost of catalysts is a main obstacle for the industrial application of these VOC removal processes. Therefore, the aim of this work is to propose an alternative material to palladium-based catalysts (which are suitable for VOCs' total oxidation): a mixed oxide synthesized in the hydrotalcite way, namely CoAlCeO. This material was compared to four catalytic materials containing palladium, selected according to the literature: Pd/α-Al 2 O 3 , Pd/HY, Pd/CeO 2 and Pd/γAl 2 O 3 . These materials have been studied for the total oxidation of toluene, butanone, and VOCs mixtures. Catalysts' performances were compared, taking into account the oxidation byproducts emitted from the process. This work highlight that the CoAlCeO catalyst presents better efficiency than Pd-based materials for the total oxidation of a VOCs mixture.

CuAlCe Oxides Issued from Layered Double Hydroxide Precursors for Ethanol and Toluene Total Oxidation

“…The catalytic performances of Cu 6 Al 1.2 Ce 0.8 -O materials are compared to the performances of supported noble metals and Cu-Ce catalysts in the literature in toluene and ethanol oxidation, based on T 50 (Table 5). Concerning the toluene reaction, the T 50 of our catalysts is higher than the one obtained with Pd/-Al 2 O 3 [43]. That was expected for supported noble metals, but in the presence of those catalysts, the formation of CO and/or by-products such as benzene is possible [43].…”

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

“…Transition metal oxides also have distinct advantages over noble metal-based catalysts in the removal of halogenated VOCs, since they exhibit a higher chlorine resistance. As a perfect illustration of the fact that metal oxides can now be considered as a good alternative to noble metals, a Co-Al-Ce mixed oxide (referred to as CoAlCeO), synthesized by the hydrotalcite route, was studied for the total oxidation of industrial VOCs (toluene, butanone and VOCs mixtures) and compared to various palladium-based catalysts (Pd/α-Al 2 O 3 , Pd/H-FAU, Pd/CeO 2 and Pd/γAl 2 O 3 ) [74]. Their catalytic properties were evaluated (considering the oxidation of by-products emitted from the process), highlighting the higher efficiency of the CoAlCeO mixed oxide than that of the Pd-based catalysts for the total oxidation of a VOCs mixture.…”

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

“…Transition metal oxides also have distinct advantages over noble metal-based catalysts in the removal of halogenated VOCs, since they exhibit a higher chlorine resistance. As a perfect illustration of the fact that metal oxides can now be considered as a good alternative to noble metals, a Co-Al-Ce mixed oxide (denoted as CoAlCeO), synthesized by the hydrotalcite route, was studied for the total oxidation of industrial VOCs (toluene, butanone and VOCs mixtures) and compared to palladium-based catalysts (Pd/α-Al2O3, Pd/H-FAU, Pd/CeO2 and Pd/γAl2O3) [74]. Their catalytic performances were evaluated (taking into account the oxidation of by-products emitted from the process), highlighting the higher efficiency of the CoAlCeO mixed oxide than that of the Pd-based materials for the total oxidation of a VOCs mixture.…”