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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Photo-Epoxidation of Cyclohexene in Gas-Phase
Background: The production of alkenes as by-products of the oil industry, which poses a threat to public health and natural components of the environment. To prevent negative impacts, these volatile organic compounds (VOCs) must be converted into safe, useful products like epoxides. In addition, this process must be environmentally friendly and energy-efficient. Photoepoxidation of cyclohexene in the gas phase using H2 and O2 gases as redox agents can solve this problem. However, the effectiveness of the process must be studied. Objectives: The purpose is to investigate the effectiveness of using cyclohexene photocatalysis as an environmentally friendly, low-energy process for the production of epoxides in the gas phase using H2 and O2 gases as redox agents. It is also expected to obtain a low-cost, efficient process with the ability to control the reaction products. Methods: Titanium dioxide (TiO2) and Titanium silicate (TS-1) were prepared using sol gel and wetness impregnation, and used as photocatalysts. Results: Stable production of cyclohexene oxide was achieved with the TS-1 while only total mineralisation to CO2 was achieved with the TiO2. The kinetic analysis conducted here showed that the gas-phase reaction mechanism follows the Eley–Rideal mechanism. Gas-phase cyclohexene reacted directly with the intermediate formed through reaction between Ti base and the hydroperoxyl species, to produce cyclohexene oxide. Thus, this step was considered the rate-determining step. The effect of temperature was investigated at various partial pressures of individual gas reactant. An approximate value of 31 kJ/mol of activation energy was achieved. No epoxide was produced in the absence of H2 under the experimental conditions studied here. Total mineralisation of cyclohexene to CO2 was observed when O2 was used alone in the system. Conclusions: The results obtained in this work revealed that utilizing H2 and O2 for various oxidation reactions at elevated temperatures is possible.
Photo-Epoxidation of Cyclohexene in Gas-Phase
Background: The production of alkenes as by-products of the oil industry, which poses a threat to public health and natural components of the environment. To prevent negative impacts, these volatile organic compounds (VOCs) must be converted into safe, useful products like epoxides. In addition, this process must be environmentally friendly and energy-efficient. Photoepoxidation of cyclohexene in the gas phase using H2 and O2 gases as redox agents can solve this problem. However, the effectiveness of the process must be studied. Objectives: The purpose is to investigate the effectiveness of using cyclohexene photocatalysis as an environmentally friendly, low-energy process for the production of epoxides in the gas phase using H2 and O2 gases as redox agents. It is also expected to obtain a low-cost, efficient process with the ability to control the reaction products. Methods: Titanium dioxide (TiO2) and Titanium silicate (TS-1) were prepared using sol gel and wetness impregnation, and used as photocatalysts. Results: Stable production of cyclohexene oxide was achieved with the TS-1 while only total mineralisation to CO2 was achieved with the TiO2. The kinetic analysis conducted here showed that the gas-phase reaction mechanism follows the Eley–Rideal mechanism. Gas-phase cyclohexene reacted directly with the intermediate formed through reaction between Ti base and the hydroperoxyl species, to produce cyclohexene oxide. Thus, this step was considered the rate-determining step. The effect of temperature was investigated at various partial pressures of individual gas reactant. An approximate value of 31 kJ/mol of activation energy was achieved. No epoxide was produced in the absence of H2 under the experimental conditions studied here. Total mineralisation of cyclohexene to CO2 was observed when O2 was used alone in the system. Conclusions: The results obtained in this work revealed that utilizing H2 and O2 for various oxidation reactions at elevated temperatures is possible.
Photo-Epoxidation of Cyclohexene in Gas-Phase
Emmanuel Alhassan Kamba (Autor:in)
2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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