Abstract:
The control of emissions of Volatile Organic Compounds (VOCs) can be carried out by oxidation, both normal and catalytic, the latter usually being conducted at lower temperatures and, thus,
requiring less investment in equipment as representing a reduction in consumption energetic. In this development, the evaluation of kinetic parameters of the catalytic oxidation reaction is presented, more specifically of ethylbenzene, using atmospheric air and platinum catalyst as oxidizer. The methodology chaired a series of steps: definition of a protocol for preparing the catalyst; characterization of the support and the prepared catalyst; definition and assembly of the reaction system; quantitative analysis by gas chromatography, operation of the reaction system and collection of process and reaction data and finally, treatment of the data to survey the kinetic parameters of the reaction. For the surveys presented, a reaction system was installed with the possibility of varying the hydrocarbon concentration in the gas stream and humidity control of the air stream, thus maintaining the hydrocarbon concentration at the reactor inlet and the temperature was varied, in different levels, ranging from 100 to 570ºC. In these determinations, the air flow in the saturation system was 10 L / min and the air flow for dilution was 40 L / min. The mass of catalyst used was 13.5 grams. As a result, it was observed that the reaction showed a variation in speed as a function of the temperature corresponding to the chemical kinetics regime in the range of approximately 100 to 170ºC, with the presence of diffusion limitations (both internal and external) starting at 300ºC up to the evaluated temperature of approximately 570ºC. The reaction order determined for the reaction was 0.74. The apparent activation energy in a chemical kinetics regime, obtained by determining the line equation between the temperatures of 100 and 170°C, was approximately 37.96 kJ / mol. Between temperatures of approximately 300 and 570ºC it was possible to determine the apparent activation energy when diffusion limitations occur, being in the order of approximately 19.34 kJ / mol.
Reference:
PORTO, Lyverson Lyra; ALDEIA, Wagner. Determinação experimental de parâmetros cinéticos em reação catalítica de oxidação do etibenzeno. Revista IPT, Tecnologia e Inovação, v.6, n.21, p.98- 129, dez., 2022.
Access to the article on the Journal’s website:
http://revista.ipt.br/index.php/revistaIPT/article/view/146/202
The control of emissions of Volatile Organic Compounds (VOCs) can be carried out by oxidation, both normal and catalytic, the latter usually being conducted at lower temperatures and, thus,
requiring less investment in equipment as representing a reduction in consumption energetic. In this development, the evaluation of kinetic parameters of the catalytic oxidation reaction is presented, more specifically of ethylbenzene, using atmospheric air and platinum catalyst as oxidizer. The methodology chaired a series of steps: definition of a protocol for preparing the catalyst; characterization of the support and the prepared catalyst; definition and assembly of the reaction system; quantitative analysis by gas chromatography, operation of the reaction system and collection of process and reaction data and finally, treatment of the data to survey the kinetic parameters of the reaction. For the surveys presented, a reaction system was installed with the possibility of varying the hydrocarbon concentration in the gas stream and humidity control of the air stream, thus maintaining the hydrocarbon concentration at the reactor inlet and the temperature was varied, in different levels, ranging from 100 to 570ºC. In these determinations, the air flow in the saturation system was 10 L / min and the air flow for dilution was 40 L / min. The mass of catalyst used was 13.5 grams. As a result, it was observed that the reaction showed a variation in speed as a function of the temperature corresponding to the chemical kinetics regime in the range of approximately 100 to 170ºC, with the presence of diffusion limitations (both internal and external) starting at 300ºC up to the evaluated temperature of approximately 570ºC. The reaction order determined for the reaction was 0.74. The apparent activation energy in a chemical kinetics regime, obtained by determining the line equation between the temperatures of 100 and 170°C, was approximately 37.96 kJ / mol. Between temperatures of approximately 300 and 570ºC it was possible to determine the apparent activation energy when diffusion limitations occur, being in the order of approximately 19.34 kJ / mol.
Reference:
PORTO, Lyverson Lyra; ALDEIA, Wagner. Determinação experimental de parâmetros cinéticos em reação catalítica de oxidação do etibenzeno. Revista IPT, Tecnologia e Inovação, v.6, n.21, p.98- 129, dez., 2022.
Access to the article on the Journal’s website:
http://revista.ipt.br/index.php/revistaIPT/article/view/146/202
