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学者姓名：周才金
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Abstract ：
The low efficiency of growing single-walled carbon nanotubes (SWCNT) poses a barrier to their application in high-performance electronic devices. However, it is difficult to control the uniform growth of SWCNT in a floating catalytic reactor due to the complex parameter control. Therefore, it is essential to enhance the growth of SWCNT in the floating catalyst chemical vapor deposition (FCCVD) process. In the present work, the influence of the reactive flow field on the growth of SWCNT, which is often neglected, is revealed. To address this issue, this work combines experiments and simulations to obtain the characteristics of the field distribution within the reactor and the trend of the products. The results of the flow field analysis indicate that thermal buoyancy is the cause of SWCNT growth limitation in FCCVD. By weakening the thermal buoyancy, a homogeneous reaction field is obtained; vortices in the flow field are reduced or even disappear; the temperature field is more homogeneous, and, importantly, the crystallinity of SWCNT is enhanced (IG/ID up to 20-fold). In addition, the decomposition process of the carbon source is also enhanced, thus suppressing the generation of by-products. Based on the results of the small tube experiments, both the increase in temperature and the decrease in residence time increased the IG/ID. Furthermore, the distributions of the maximum and minimum diameters in SWCNT imply variations in the growth modes of SWCNT at different temperatures. © 2024 Elsevier B.V.
Keyword ：
Buoyancy Buoyancy Catalysts Catalysts Chemical vapor deposition Chemical vapor deposition Crystallinity Crystallinity Flow fields Flow fields Residence time distribution Residence time distribution Single-walled carbon nanotubes (SWCN) Single-walled carbon nanotubes (SWCN)
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| GB/T 7714 | Yu, Guo , Han, Peilin , Yi, Hongmei et al. Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT [J]. | Diamond and Related Materials , 2024 , 145 . |
| MLA | Yu, Guo et al. "Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT" . | Diamond and Related Materials 145 (2024) . |
| APA | Yu, Guo , Han, Peilin , Yi, Hongmei , Zhao, Jiaxiang , Hou, Songjia , Yan, Zuoyi et al. Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT . | Diamond and Related Materials , 2024 , 145 . |
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The efficient capture of CO2 has always been a goal pursued by people. However, low gas handling capacity and low gas-liquid ratio restricts existing gas-liquid contactors, especially for non-rotating ones. In this study, a gas-liquid contactor with high gas handling capacity and high gas-liquid ratio, the rotating spiral contactor, was developed. Hydrodynamic properties of the contactor were experimentally or theoretically investigated. A novel interface model was developed to describe gas-liquid interface shape. CO2 capture using MEA/DMEA aqueous solution were evaluated in terms of space-time yield (tau), overall volumetric mass transfer coefficient (KGae) and CO2 capture efficiency (eta). A rate -based model was developed and applied for the first time to predict CO2 capture in the rotating spiral contactor. The hydrodynamic results showed that liquid layer thickness was below 400 mu m for the liquid with viscosity of 14.5 mPa.s. Under the rotational speed of 1200 rpm, the gas-liquid ratio ranged from 525 to 2700, while the gas-liquid surface area remained around 667 m2/m3. The interface model predicted interface thickness within a relative deviation of +/- 20 %. The results also showed that tau, KGae and eta respectively were 3428-17021 h-1, 1.0-6.4 kmol.m- 3.h-1.kPa- 1 and 38-98 % at the gas-liquid ratio range of 200-1000. The predicted KGae and eta by rate -based model agreed well with the experimental data within a relative deviation of +/- 15 %. This rotating spiral contactor is ideally suitable for the scenarios with large gas handling requirement and high gas-liquid ratio.
Keyword ：
CO2 capture CO2 capture High gas-liquid ratio High gas-liquid ratio Interface model Interface model Mass transfer coefficient Mass transfer coefficient Rate-based model Rate-based model Rotating spiral contactor Rotating spiral contactor
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| GB/T 7714 | Chen, Tianming , Zheng, Meiqin , Zheng, Chenghui et al. CO2 capture in a novel rotating spiral contactor with hydraulic seal: Hydromechanics, mass transfer and modeling [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 340 . |
| MLA | Chen, Tianming et al. "CO2 capture in a novel rotating spiral contactor with hydraulic seal: Hydromechanics, mass transfer and modeling" . | SEPARATION AND PURIFICATION TECHNOLOGY 340 (2024) . |
| APA | Chen, Tianming , Zheng, Meiqin , Zheng, Chenghui , Yan, Zhongyi , Yan, Zuoyi , Zhou, Caijin et al. CO2 capture in a novel rotating spiral contactor with hydraulic seal: Hydromechanics, mass transfer and modeling . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 340 . |
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Abstract ：
Micromixing efficiency is an important parameter for evaluating the multiphase mass transfer performance and reaction efficiency of microreactors. In this work, the novel curved capillary reactor with different shapes was designed to generate Dean flow, which was used to enhance the liquid -liquid micromixing performance. The Villermaux-Dushman probe reaction was employed to characterize the micromixing performance in different curved capillary microreactors. The effects of experiment parameters such as liquid flow rate, inner diameter, tube length, and curve diameter on micromixing performance were systematically investigated. Under the optimal conditions, the minimum value of the segmentation factor X-S was 0.008. It was worth noting that at the low Reynolds number (Re < 30), the change of curved shape on the capillary microreactor can significantly improve the micromixing performance with X-S reduced by 37.5%. Further, the correlations of segment index X-S with dimensionless factor such as Reynolds number or Dean number were developed, which can be used to predict the liquidliquid micromixing performance in capillary microreactors.
Keyword ：
Dean flow Dean flow Micromixing performance Micromixing performance Microreactor Microreactor Process intensification Process intensification
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| GB/T 7714 | Wu, Shaoyun , Ma, Zhuang , Yang, Zichi et al. Enhancement of liquid-liquid micromixing performance in curved capillary microreactor by generation of Dean vortices [J]. | CHINESE JOURNAL OF CHEMICAL ENGINEERING , 2024 , 68 : 76-82 . |
| MLA | Wu, Shaoyun et al. "Enhancement of liquid-liquid micromixing performance in curved capillary microreactor by generation of Dean vortices" . | CHINESE JOURNAL OF CHEMICAL ENGINEERING 68 (2024) : 76-82 . |
| APA | Wu, Shaoyun , Ma, Zhuang , Yang, Zichi , Zhao, Suying , Zhou, Caijin , Zheng, Huidong . Enhancement of liquid-liquid micromixing performance in curved capillary microreactor by generation of Dean vortices . | CHINESE JOURNAL OF CHEMICAL ENGINEERING , 2024 , 68 , 76-82 . |
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Electrochemical water splitting to prepare hydrogen, including hydrogen evolution reaction (HER), is considered as one of the green and practical approaches for the wide application of new energy sources. During this process, efficient catalyst is essential to hydrogen production efficiency. Wherein, nickel–cobalt complex sulfides (CoS@NiS) with few layers and large contact area is an emerging cost-effective catalyst for hydrogen production. However, traditional hydrothermal synthesis process implemented in the stirred tank reactor, because of its low heat and mass transfer efficiency, resulted in long reaction time and high energy consumption, limiting the scale-up production and synthesis efficiency. In this work, an efficient continuous synthesis platform based on microreactor was designed to prepare high-performance and few-layer CoS@NiS nanosheets with porous structure of petaloid clusters and wrinkled defects edge. By optimizing experimental conditions, the prepared CoS@NiS nanosheets exhibited excellent electrocatalysis performance for HER with low overpotential of 157 mV at 10 mA·cm−2, small Tafel slope of 75.9 mV·dec-1 and long-term catalytic stability. It was worth noting that the HER activity of CoS@NiS nanosheets obtained in continuous flow platform within 20 min was higher than that in the traditional stirred tank reactor over 12 h (182 mV at 10 mA·cm−2 and 93.3 mV·dec-1), significantly improving the synthesis efficiency. The continuous flow synthesis platform provides an efficient and convenient solution for the scale-up production of high-performance electrocatalytic nanomaterials. © 2024
Keyword ：
Chemical reactors Chemical reactors Cobalt compounds Cobalt compounds Cobalt deposits Cobalt deposits Cost effectiveness Cost effectiveness Electrocatalysis Electrocatalysis Electrocatalysts Electrocatalysts Energy utilization Energy utilization Graphene Graphene Hydrogen production Hydrogen production Hydrothermal synthesis Hydrothermal synthesis Mass transfer Mass transfer Nanosheets Nanosheets Slope stability Slope stability Sulfur compounds Sulfur compounds Tanks (containers) Tanks (containers)
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| GB/T 7714 | Wu, Shaoyun , Chen, Chen , Shi, Ruixing et al. A multistep continuous microreactor platform for rapid preparation of CoS@NiS nanosheets with efficient electrocatalytic hydrogen evolution [J]. | Fuel , 2024 , 371 . |
| MLA | Wu, Shaoyun et al. "A multistep continuous microreactor platform for rapid preparation of CoS@NiS nanosheets with efficient electrocatalytic hydrogen evolution" . | Fuel 371 (2024) . |
| APA | Wu, Shaoyun , Chen, Chen , Shi, Ruixing , Zhou, Caijin , Wang, Peican . A multistep continuous microreactor platform for rapid preparation of CoS@NiS nanosheets with efficient electrocatalytic hydrogen evolution . | Fuel , 2024 , 371 . |
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Unbaffled U-shaped mesoscale oscillatory flow reactors (meso-OFRs) were developed to prevent solid deposition and prepare uniform barium sulfate (BaSO4) nanoparticles with environmental protection function. The results showed that the oscillation significantly reduced granular deposition; the greater the intensity of the oscillation, the faster it reached uniformity, and the less likely the granules were to be deposited. These results can be explained by the formation of a larger vortex size, which can strengthen the turbulent mixing of fluid in the reactor, promote the interaction and forced mixing between the liquid phase and solid particles, enhance the internal shear stress of the fluid, and contribute to the secondary suspension of solid particles and the disintegration of particle agglomeration. The prepared BaSO4 nanoparticles with oscillation were smaller in size and lower in pressure drop than those produced without oscillation, which conclusively illustrated that oscillation effectively prevented channel deposition and clogging.
Keyword ：
BaSO 4 nanoparticles BaSO 4 nanoparticles Granular deposition Granular deposition Liquid -solid two-phase flow Liquid -solid two-phase flow Meso-OFR Meso-OFR Vortex Vortex
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| GB/T 7714 | Zheng, Meiqin , Liu, Jianchen , Tian, Linda et al. Unbaffled mesoscale reactor coupled oscillatory flow-enhanced liquid-solid two-phase flow [J]. | POWDER TECHNOLOGY , 2023 , 434 . |
| MLA | Zheng, Meiqin et al. "Unbaffled mesoscale reactor coupled oscillatory flow-enhanced liquid-solid two-phase flow" . | POWDER TECHNOLOGY 434 (2023) . |
| APA | Zheng, Meiqin , Liu, Jianchen , Tian, Linda , Yan, Zuoyi , Zhou, Caijin , Li, Haohong et al. Unbaffled mesoscale reactor coupled oscillatory flow-enhanced liquid-solid two-phase flow . | POWDER TECHNOLOGY , 2023 , 434 . |
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