An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance
Abstract The reaction rate is sometimes thoroughly described by several kinetic models simultaneously. In this case, the discrimination of the particular model may be challenging. Herein, we demonstrate that a change in the rate-limiting step of a reaction mechanism may result in a significant devia...
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| Format: | Article |
| Language: | English |
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Springer
2024-12-01
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| Series: | Discover Applied Sciences |
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| Online Access: | https://doi.org/10.1007/s42452-024-06385-0 |
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| author | O. O. Zhokh P. E. Strizhak |
| author_facet | O. O. Zhokh P. E. Strizhak |
| author_sort | O. O. Zhokh |
| collection | DOAJ |
| description | Abstract The reaction rate is sometimes thoroughly described by several kinetic models simultaneously. In this case, the discrimination of the particular model may be challenging. Herein, we demonstrate that a change in the rate-limiting step of a reaction mechanism may result in a significant deviation of the effectiveness factor even if the kinetic rate equations provide nearly identical reaction rates. On this basis, the comparison of the experimental effectiveness factor and the effectiveness factor calculated theoretically using the corresponding rate equations may shed light on the true reaction mechanism. Since many industrial processes operate under internal and external mass transfer limitations, the effectiveness factor is obtained by accounting for pore diffusion resistance and diffusion resistance at the outer surface of a catalyst particle. Verification of the obtained formalism is performed using the kinetic constants for the commercially available process of the methanol dehydration to dimethyl ether over γ-alumina catalyst. |
| format | Article |
| id | doaj-art-cf81699cea2b4c849ed2367cfe0da13d |
| institution | Kabale University |
| issn | 3004-9261 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Discover Applied Sciences |
| spelling | doaj-art-cf81699cea2b4c849ed2367cfe0da13d2024-12-08T12:40:53ZengSpringerDiscover Applied Sciences3004-92612024-12-0161211010.1007/s42452-024-06385-0An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistanceO. O. Zhokh0P. E. Strizhak1L.V. Pisarzhevskii Institute of Physical Chemistry of National Academy of Sciences of UkraineL.V. Pisarzhevskii Institute of Physical Chemistry of National Academy of Sciences of UkraineAbstract The reaction rate is sometimes thoroughly described by several kinetic models simultaneously. In this case, the discrimination of the particular model may be challenging. Herein, we demonstrate that a change in the rate-limiting step of a reaction mechanism may result in a significant deviation of the effectiveness factor even if the kinetic rate equations provide nearly identical reaction rates. On this basis, the comparison of the experimental effectiveness factor and the effectiveness factor calculated theoretically using the corresponding rate equations may shed light on the true reaction mechanism. Since many industrial processes operate under internal and external mass transfer limitations, the effectiveness factor is obtained by accounting for pore diffusion resistance and diffusion resistance at the outer surface of a catalyst particle. Verification of the obtained formalism is performed using the kinetic constants for the commercially available process of the methanol dehydration to dimethyl ether over γ-alumina catalyst.https://doi.org/10.1007/s42452-024-06385-0Kinetic modelDiscriminationExternal diffusionEffectiveness factor |
| spellingShingle | O. O. Zhokh P. E. Strizhak An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance Discover Applied Sciences Kinetic model Discrimination External diffusion Effectiveness factor |
| title | An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance |
| title_full | An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance |
| title_fullStr | An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance |
| title_full_unstemmed | An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance |
| title_short | An approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance |
| title_sort | approach to select between the plausible kinetic models of a heterogeneous catalytic process using intraparticle diffusion with external mass transfer resistance |
| topic | Kinetic model Discrimination External diffusion Effectiveness factor |
| url | https://doi.org/10.1007/s42452-024-06385-0 |
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