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学者姓名：郑辉东
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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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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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Dehydroxylation of biomass-based platform molecules is critical for obtaining building blocks for use in the chemical industry. Acid catalytic dehydration has provided a feasible route. However, simultaneously pursuing high product-selective and ultra-stable catalysts for the dehydroxylation of polyols remains an open challenge. In this study, a strategy for in-situ Bronsted acid sites (BAS) with chemo-adsorption selectivity is proposed. The construction of defect sites B[3] and P[4] species has been proved to be a prerequisite for the dynamic acid site formation at hydrothermal conditions. The BPO4 catalyst with in-situ BAS can achieve the high selectivity of acrolein (similar to 80%) and robust stability of catalyst (over 425 h) using glycerol dehydration as a model reaction. In addition, in-situ BAS is highly selective for secondary hydroxyl groups and has been extended to other substrate applications. This catalytic strategy provides a green, efficient, and economical approach for converting biomassderived polyols to high-value-added chemicals.
Keyword ：
Acrolein Acrolein Biomass Biomass Dehydration Dehydration Glycerol Glycerol In -situ Br onsted acid In -situ Br onsted acid
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| GB/T 7714 | Su, Chenxin , Zhou, Shouquan , Wu, Shaoyun et al. Highly efficient dehydration of polyols: In-situ Brempty setnsted acid from boron phosphate catalyst [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 483 . |
| MLA | Su, Chenxin et al. "Highly efficient dehydration of polyols: In-situ Brempty setnsted acid from boron phosphate catalyst" . | CHEMICAL ENGINEERING JOURNAL 483 (2024) . |
| APA | Su, Chenxin , Zhou, Shouquan , Wu, Shaoyun , Gao, Mingbin , Zhang, Weiling , Ma, Zhuang et al. Highly efficient dehydration of polyols: In-situ Brempty setnsted acid from boron phosphate catalyst . | CHEMICAL ENGINEERING JOURNAL , 2024 , 483 . |
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制备Pd负载在氮掺杂碳纳米管(NCNTs)载体上的Pd/NCNTs催化剂，并将其用于间二硝基苯催化加氢生成间苯二胺的反应。研究NCNTs的不同制备方法对Pd/NCNTs催化剂催化性能的影响。结果表明，Pd纳米颗粒可以更均匀地分散在NCNTs载体上，可与载体形成强相互作用。当NCNTs中的氮含量越高且吡啶氮占比较高时，Pd/NCNTs催化剂的加氢活性越高。在间二硝基苯催化加氢反应中，Pd/NCNTs催化剂相较于Pd/CNTs催化剂的加氢活性提高了69%。
Keyword ：
催化剂工程 催化剂工程 吡啶氮 吡啶氮 氮掺杂 氮掺杂 硝基加氢 硝基加氢 钯催化剂 钯催化剂 间二硝基苯 间二硝基苯
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| GB/T 7714 | 刘加帅 , 王楠 , 郑辉东 et al. 氮掺杂碳纳米管负载钯基催化剂在间二硝基苯加氢中的应用 [J]. | 工业催化 , 2024 , 32 (08) : 24-30 . |
| MLA | 刘加帅 et al. "氮掺杂碳纳米管负载钯基催化剂在间二硝基苯加氢中的应用" . | 工业催化 32 . 08 (2024) : 24-30 . |
| APA | 刘加帅 , 王楠 , 郑辉东 , 范立海 , 吴丹 . 氮掺杂碳纳米管负载钯基催化剂在间二硝基苯加氢中的应用 . | 工业催化 , 2024 , 32 (08) , 24-30 . |
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In the field of biomemorizers, the simultaneous enhancement of resistive switching (RS) performance and environmental robustness, and the understanding the RS mechanism involving interfacial interaction is still challengeable. Herein, the bio-composites by encapsulating graphene (GR), graphene oxide (GO) and reduced graphene oxide (RGO) into chitosan (CS) have been fabricated as memory devices with the structure of FTO/biocomposite/Ag. Among them, FTO/GO@CS(12 %)/Ag biomemorizer exhibits the best RS performance with high ON/OFF ratio (10 5.92 ), and it possesses good thermal (170 degrees C) and irradiation stabilities (UV exposure for 96 h). The RS mechanism is due to the migration of oxygen vacancies accompanied by formation of Ag conducting filaments in the bio-composite films. Therefore, the enhanced resistive switching performance after encapsulating into CS can be explained as the increment of defects, the higher current densities and quenched radicals. Specially, for the first time we find the presence of voltage -induced packing mode changes in GO@CS composite, which can facilitate the migration of oxygen vacancies and render its best RS performance. In all, the more carboxyl groups can strengthen the GO -CS interfacial interactions through the formation of stable hydrogen bonding network and covalent bonds, which can enhance the stabilities and makes the composites be more sensitive to electrical stimulus. The rules drawn in this work will be significant for the construction of new biomemorizers with good environmental robustness.
Keyword ：
Biomemorizer Biomemorizer Chitosan Chitosan Environmental robustness Environmental robustness Graphene derivant Graphene derivant Resistive switching mechanism Resistive switching mechanism
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| GB/T 7714 | Zheng, Mei -Qin , Yi, Hong -Mei , Yu, Guo et al. Graphene derivant@chitosan composite-based biomemorizers: The effect of functional groups on the resistive switching performances and their thermal/irradiative stabilities [J]. | DIAMOND AND RELATED MATERIALS , 2024 , 146 . |
| MLA | Zheng, Mei -Qin et al. "Graphene derivant@chitosan composite-based biomemorizers: The effect of functional groups on the resistive switching performances and their thermal/irradiative stabilities" . | DIAMOND AND RELATED MATERIALS 146 (2024) . |
| APA | Zheng, Mei -Qin , Yi, Hong -Mei , Yu, Guo , Wang, Jia-Wei , Lv, Zhou -Lin , Li, Hui -Fang et al. Graphene derivant@chitosan composite-based biomemorizers: The effect of functional groups on the resistive switching performances and their thermal/irradiative stabilities . | DIAMOND AND RELATED MATERIALS , 2024 , 146 . |
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The Microscale Oscillatory Flow Reactor (MOFR) can achieve good plug flow and micromixing performance simultaneously at laminar net flow conditions. An unbaffled U-shaped microreactor coupled with oscillating flow technology was designed to study the macro and micromixing performance. Firstly, the influence of oscillations on the flow performance was studied to reveal the formation rule of vortex. The simulation results showed that the continuous formation and destruction of periodic vortexes occurred in the microreactor with oscillation. With the increase of oscillation intensity, the vortex size in the radial direction first gradually increased and then becomes stable, and gradually moved axially, resulting in axial diffusion. Secondly, the effect of oscillation on the macromixing and micromixing performance were investigated. The results showed that the coupling oscillation could greatly improve the macromixing and micromixing performance. The macromixing and micromixing performance were promoted simultaneously at lower oscillation intensity and then tended to be flat due to the axial diffusion at high oscillation intensity. When φ>6.05, the minimum micromixing time and the maximum number of tanks can be achieved at the same time. At a velocity ratio of about 23, FoM reached a maximum of about 3.5. © 2024
Keyword ：
Computational fluid dynamics Computational fluid dynamics Diffusion Diffusion Laminar flow Laminar flow Oscillating flow Oscillating flow Vortex flow Vortex flow
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| GB/T 7714 | Yu, Liping , Zheng, Meiqin , Wang, Jiawei et al. Enhanced mixing characteristics of unbaffled U-shaped microreactor coupled oscillatory flow [J]. | Chemical Engineering and Processing - Process Intensification , 2024 , 205 . |
| MLA | Yu, Liping et al. "Enhanced mixing characteristics of unbaffled U-shaped microreactor coupled oscillatory flow" . | Chemical Engineering and Processing - Process Intensification 205 (2024) . |
| APA | Yu, Liping , Zheng, Meiqin , Wang, Jiawei , Yan, Zuoyi , Yao, Wei , Li, Haohong et al. Enhanced mixing characteristics of unbaffled U-shaped microreactor coupled oscillatory flow . | Chemical Engineering and Processing - Process Intensification , 2024 , 205 . |
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d-Allulose, a C-3 epimer of d-fructose, has great market potential in food, healthcare, and medicine due to its excellent biochemical and physiological properties. Microbial fermentation for d-allulose production is being developed, which contributes to cost savings and environmental protection. A novel metabolic pathway for the biosynthesis of d-allulose from a d-xylose-methanol mixture has shown potential for industrial application. In this study, an artificial antisense RNA (asRNA) was introduced into engineered Escherichia coli to diminish the flow of pentose phosphate (PP) pathway, while the UDP-glucose-4-epimerase (GalE) was knocked out to prevent the synthesis of byproducts. As a result, the d-allulose yield on d-xylose was increased by 35.1%. Then, we designed a d-xylose-sensitive translation control system to regulate the expression of the formaldehyde detoxification operon (FrmRAB), achieving self-inductive detoxification by cells. Finally, fed-batch fermentation was carried out to improve the productivity of the cell factory. The d-allulose titer reached 98.6 mM, with a yield of 0.615 mM/mM on d-xylose and a productivity of 0.969 mM/h. © 2024 American Chemical Society.
Keyword ：
d-allulose d-allulose Escherichia coli Escherichia coli fermentation fermentation metabolic engineering metabolic engineering
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| GB/T 7714 | Guo, Q. , Zheng, L.-J. , Zheng, S.-H. et al. Enhanced Biosynthesis of d-Allulose from a d-Xylose-Methanol Mixture and Its Self-Inductive Detoxification by Using Antisense RNAs in Escherichia coli [J]. | Journal of Agricultural and Food Chemistry , 2024 , 72 (26) : 14821-14829 . |
| MLA | Guo, Q. et al. "Enhanced Biosynthesis of d-Allulose from a d-Xylose-Methanol Mixture and Its Self-Inductive Detoxification by Using Antisense RNAs in Escherichia coli" . | Journal of Agricultural and Food Chemistry 72 . 26 (2024) : 14821-14829 . |
| APA | Guo, Q. , Zheng, L.-J. , Zheng, S.-H. , Zheng, H.-D. , Lin, X.-C. , Fan, L.-H. . Enhanced Biosynthesis of d-Allulose from a d-Xylose-Methanol Mixture and Its Self-Inductive Detoxification by Using Antisense RNAs in Escherichia coli . | Journal of Agricultural and Food Chemistry , 2024 , 72 (26) , 14821-14829 . |
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Sustainable synthesis of acrolein, a key chemical intermediate, from biomass-derived glycerol is highly attractive. However, conventional catalysts for the dehydration of glycerol suffer from low acrolein selectivity and high deactivation tendency. Herein, a novel green catalyst (HPW/T-0.6 S-COOH) was prepared and employed in the dehydration of glycerol in a continuous flow reactor. The performance of different catalysts and the effects of reaction conditions (reaction temperature, N-2 flow rate, and glycerol concentration) were examined. The HPW/T-0.6 S-COOH catalyst provides the best glycerol conversion of 96.38% and acrolein selectivity of 92.01%. The NH3-TPD and pyridine-FTIR results indicate that the Bronsted acid site is more susceptible to acrolein, while the weak strength acid site effectively prevents the further reaction of acrolein, providing practical insights for the rational design of efficient and continuous synthesis of acrolein catalysts.
Keyword ：
Acrolein Acrolein Continuous synthesis Continuous synthesis glycerol dehydration glycerol dehydration HPW/T0.6S-COOH catalyst HPW/T0.6S-COOH catalyst
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| GB/T 7714 | Su, Chen-Xin , Chen, Jing-Jing , Wu, Shao-Yun et al. Continuous dehydration of glycerol to Acrolein based on HPW/TS-COOH catalyzation [J]. | JOURNAL OF FLOW CHEMISTRY , 2023 , 13 (2) : 143-154 . |
| MLA | Su, Chen-Xin et al. "Continuous dehydration of glycerol to Acrolein based on HPW/TS-COOH catalyzation" . | JOURNAL OF FLOW CHEMISTRY 13 . 2 (2023) : 143-154 . |
| APA | Su, Chen-Xin , Chen, Jing-Jing , Wu, Shao-Yun , Li, Shao-Heng , Zhou, Shou-Quan , Zheng, Hui-Dong et al. Continuous dehydration of glycerol to Acrolein based on HPW/TS-COOH catalyzation . | JOURNAL OF FLOW CHEMISTRY , 2023 , 13 (2) , 143-154 . |
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The mild alkali-treated 13X was employed in the liquid phase isomerization reaction of alpha-pinene to increase the yield of limonene. A maximum alpha-pinene conversion of 100% and limonene yield of 59.1% could be achieved. Crystallinity could be well retained, and the amounts of medium-strong acid sites and the distribution of Bronsted and Lewis acid sites could be changed after the mild alkali treatment for 13X zeolite. Samples with higher micropore specific surface area were easier to obtain higher yields of limonene due to shape-selectivity. A proper amount of the medium-strong acid and the synergistic effect of Bronsted and Lewis acid sites were beneficial to enhance the catalytic activity and the yield of monocyclic product limonene. The main reason for catalyst deactivation could be the decrease in the active sites due to soft coke deposition. For the regeneration process, the conversions of alpha-pinene were between 95% and 99% during the first seven cycles and the conversion dropped to 90.6% after the eighth cycle, which demonstrated that the ethanol flushing and calcination could be an effective regeneration method for the 13X catalyst used in the alpha-pinene isomerization reaction.
Keyword ：
13X zeolite 13X zeolite Limonene Limonene Mild alkali treatment Mild alkali treatment ?-pinene isomerization ?-pinene isomerization
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| GB/T 7714 | Su, Chenxin , Luo, Xiheng , Chen, Jingjing et al. Effective synthesis of limonene over mild alkali-modified 13X catalysts in alpha-pinene isomerization [J]. | MICROPOROUS AND MESOPOROUS MATERIALS , 2023 , 348 . |
| MLA | Su, Chenxin et al. "Effective synthesis of limonene over mild alkali-modified 13X catalysts in alpha-pinene isomerization" . | MICROPOROUS AND MESOPOROUS MATERIALS 348 (2023) . |
| APA | Su, Chenxin , Luo, Xiheng , Chen, Jingjing , Wu, Dan , Fan, Lihai , Liu, Jie et al. Effective synthesis of limonene over mild alkali-modified 13X catalysts in alpha-pinene isomerization . | MICROPOROUS AND MESOPOROUS MATERIALS , 2023 , 348 . |
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