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Comparison of the Mn-Ni powder and monolithic catalyst in toluene combustion

One of the major air pollutants that give rise to harmful health and environmental effects are volatile organic compounds (VOCs) emitted from many of anthropogenic sources. Among existing destructive VOC removal methods, catalytic combustion is the most convenient one due to low reaction temperatures that lead to lower NOx and CO emissions. Catalysts usually used in this process are supported or unsupported noble metals and transition metal oxides. Recently, many efforts have been made on the utilization of low-cost and environment-friendly raw materials, such as manganese oxide combined with nickel, which have been investigated in this research. Toluene has been chosen as a representative volatile organic compound since it contains aromatic ring which cannot be easily degrade. Catalysts based on the mixed manganese oxides were synthesized by the co-precipitation method and characterized by different instrumental techniques (DSC, FTIR, SEM, etc.) Monolith Mn- Ni catalyst was prepared using the washcoating method. Catalytic combustion of toluene was carried out in the fixed bed reactor and the metallic monolith reactor at different reaction temperatures and different flow rates of the reaction mixture (23-100 ml/min). It was revealed that the manganese-nickel mixed oxide catalysts show good catalytic activity, comparable to those obtained with binary mixtures of manganese and other transition metals [1, 2], achieving a complete oxidation of toluene in the temperature range of 230- 350°C, depending on the space time inside the reactor, toluene initial concentration and the type of catalyst used. [1] Saqer, S. M., Kondarides, D. I., Verykios, X. E. (2011): Catalytic oxidation of toluene over binary mixtures of copper, manganese and cerium oxides supported on γ-Al2O3, Appl. Catal. B: Environ. 103, 275-286. [2] Morales, M. R., Barbero, B. P., Cadus, L. E. (2011): MnCu Catalyst Deposited on Metallic Monoliths for Total Oxidation of Volatile Organic Compounds, Catal. Lett. 141, 1598-1607.

toluene combustion ; Mn-Ni powder catalyst ; Mn-Ni monolithic catalyst

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