Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide
A clustered countercurrent-flow micro-channel reactor (C-CFMCR) has been assembled by the numbering-up of its single counterpart (S-CFMCR). Its micromixing performance was then studied experimentally using a competitive parallel reaction system, and the micromixing time was calculated as the micromi...
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| Format: | Article |
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MDPI AG
2018-10-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/9/11/549 |
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| author | Kun-Peng Cheng Bo Wu Ren-Jie Gu Li-Xiong Wen |
| author_facet | Kun-Peng Cheng Bo Wu Ren-Jie Gu Li-Xiong Wen |
| author_sort | Kun-Peng Cheng |
| collection | DOAJ |
| description | A clustered countercurrent-flow micro-channel reactor (C-CFMCR) has been assembled by the numbering-up of its single counterpart (S-CFMCR). Its micromixing performance was then studied experimentally using a competitive parallel reaction system, and the micromixing time was calculated as the micromixing performance index. It was found that the micromixing time of C-CFMCR was ranged from 0.34 to 10 ms according to its numbering-up times and the operating conditions of the reactor, and it was close to that of S-CFMCR under the same operating conditions, demonstrating a weak scaling-up effect from S-CFMCR to C-CFMCR. The C-CFMCR was then applied to prepare ultrafine manganese dioxide in a continuous manner at varying micromixing time. It showed that the micromixing time had a major effect on the particle structure. More uniform and smaller MnO<sub>2</sub> particles were obtained with intensified micromixing. By building a typical three electrode system to characterize their performance as a supercapacitor material, the MnO<sub>2</sub> particles prepared by both S-CFMCR and C-CFMCR under optimal conditions displayed a specific capacitance of ~175 F·g<sup>−1</sup> at the current density of 1 A·g<sup>−1</sup>, with a decline of ~10% after 500 charge-discharge cycles. This work showed that C-CFMCR will have a great potential for the continuous and large-scale preparation of ultrafine particles. |
| first_indexed | 2024-12-13T01:06:19Z |
| format | Article |
| id | doaj.art-3cc6143d4211495ea5207bb77773fb4d |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-12-13T01:06:19Z |
| publishDate | 2018-10-01 |
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| series | Micromachines |
| spelling | doaj.art-3cc6143d4211495ea5207bb77773fb4d2022-12-22T00:04:33ZengMDPI AGMicromachines2072-666X2018-10-0191154910.3390/mi9110549mi9110549Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese DioxideKun-Peng Cheng0Bo Wu1Ren-Jie Gu2Li-Xiong Wen3State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, ChinaResearch Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, ChinaA clustered countercurrent-flow micro-channel reactor (C-CFMCR) has been assembled by the numbering-up of its single counterpart (S-CFMCR). Its micromixing performance was then studied experimentally using a competitive parallel reaction system, and the micromixing time was calculated as the micromixing performance index. It was found that the micromixing time of C-CFMCR was ranged from 0.34 to 10 ms according to its numbering-up times and the operating conditions of the reactor, and it was close to that of S-CFMCR under the same operating conditions, demonstrating a weak scaling-up effect from S-CFMCR to C-CFMCR. The C-CFMCR was then applied to prepare ultrafine manganese dioxide in a continuous manner at varying micromixing time. It showed that the micromixing time had a major effect on the particle structure. More uniform and smaller MnO<sub>2</sub> particles were obtained with intensified micromixing. By building a typical three electrode system to characterize their performance as a supercapacitor material, the MnO<sub>2</sub> particles prepared by both S-CFMCR and C-CFMCR under optimal conditions displayed a specific capacitance of ~175 F·g<sup>−1</sup> at the current density of 1 A·g<sup>−1</sup>, with a decline of ~10% after 500 charge-discharge cycles. This work showed that C-CFMCR will have a great potential for the continuous and large-scale preparation of ultrafine particles.https://www.mdpi.com/2072-666X/9/11/549clustered countercurrent-flow micro-channel reactormicromixing timepreparationultrafine particlemanganese dioxide |
| spellingShingle | Kun-Peng Cheng Bo Wu Ren-Jie Gu Li-Xiong Wen Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide Micromachines clustered countercurrent-flow micro-channel reactor micromixing time preparation ultrafine particle manganese dioxide |
| title | Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide |
| title_full | Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide |
| title_fullStr | Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide |
| title_full_unstemmed | Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide |
| title_short | Micromixing Study of a Clustered Countercurrent-Flow Micro-Channel Reactor and Its Application in the Precipitation of Ultrafine Manganese Dioxide |
| title_sort | micromixing study of a clustered countercurrent flow micro channel reactor and its application in the precipitation of ultrafine manganese dioxide |
| topic | clustered countercurrent-flow micro-channel reactor micromixing time preparation ultrafine particle manganese dioxide |
| url | https://www.mdpi.com/2072-666X/9/11/549 |
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