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Acquiring real kinetics of reactions in the inhibitory atmosphere containing product gases using micro fluidized bed |
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| Authors: | Xuejing Liu Wenqian Hao Kexin Wang Yingche Wang Ping An Hong Zhang Junrong Yue Dingrong Bai Guangwen Xu |
| Affiliation: | 1. Institute of Industrial Chemistry and Energy Technology, Key Laboratory on Resources Chemicals and Materials of Ministry of Education, Shenyang University of Chemical Technology, Shenyang, China;2. Institute of Industrial Chemistry and Energy Technology, Key Laboratory on Resources Chemicals and Materials of Ministry of Education, Shenyang University of Chemical Technology, Shenyang, China Contribution: Investigation, Validation;3. Institute of Industrial Chemistry and Energy Technology, Key Laboratory on Resources Chemicals and Materials of Ministry of Education, Shenyang University of Chemical Technology, Shenyang, China Contribution: Validation;4. Institute of Industrial Chemistry and Energy Technology, Key Laboratory on Resources Chemicals and Materials of Ministry of Education, Shenyang University of Chemical Technology, Shenyang, China Contribution: Methodology, Resources;5. Institute of Industrial Chemistry and Energy Technology, Key Laboratory on Resources Chemicals and Materials of Ministry of Education, Shenyang University of Chemical Technology, Shenyang, China Contribution: Resources, Validation;6. State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China Contribution: Resources |
| Abstract: | This study proposed an isotope-tagging method to investigate reactions under the atmosphere of product gas. To illustrate this method, the calcination kinetics of calcium carbonate Ca13CO3 in CO2 atmospheres were investigated by monitoring 13CO2 produced using a micro fluidized bed reaction analyzer (MFBRA). The results demonstrated that the presence of CO2 in reaction atmosphere increases the apparent activation energy. The increase in the apparent activation energy is, however, significantly overestimated by the thermogravimetric analyzer (TGA) because of the excessive suppression by stagnated product gas inside the sample crucible. Comparatively, the apparent activation energy increases with CO2 from the MFBRA due primarily to the thermal equilibrium limitation, because the gas diffusion in the MFBRA is essentially eliminated. It is thus concluded that the MFBRA is quite capable of acquiring the real kinetics of reactions in such inhibitory atmospheres. |
| Keywords: | gas–solids reaction inhibitory atmosphere isotopes tagging kinetics micro fluidized bed |