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Abstract ：
Sequential paired electrosynthesis capable of the production of organic chemicals through a series of electrochemical reactions that occur consecutively and in pairs are of high significance. Herein, a three-dimensional porous carbon felt-loaded PbO2 electrode (PbO2/CF) with a self-supported nanostructure was fabricated using a double-cathode electrodeposition method, which served as an efficient electrocatalyst enabling the unique sequential paired electrosynthesis of 1,4-hydroquinone (1,4-HQ) from phenol in a membrane-free electrolytic cell. In such an exotic paired electrolysis system, phenol is first oxidized to p-benzoquinone at the anode, which is subsequently reduced to 1,4-HQ at the cathode. The as-obtained PbO2/CF electrode exhibited a remarkable electrochemical performance, achieving impressive conversion and selectivity of 94.5% and 72.1%, respectively, for the conversion of phenol to 1,4-HQ. This exceptional performance can be attributed to the open porous self-supported structure of the PbO2/CF electrode, which improves the active site exposure and substrate adsorption capability and reduces mass and charge transfer resistance. Furthermore, the catalyst electrode well maintained its structure integrity even after 140 hours of long-term use, further highlighting its promising application for the electrosynthesis of 1,4-HQ. Moreover, this sequential paired electrosynthesis strategy can be further extended to other substrates with electron-withdrawing/donating groups over the PbO2/CF electrode. The proof of concept in this innovative sequential paired electrosynthesis could provide a sustainable and efficient way to produce various desired organic compounds.Keywords: Phenol; 1,4-Hydroquinone; Electrocatalysis; Sequential paired electrosynthesis; Self-supported electrodes.
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| GB/T 7714 | Zhang, Wei-Ling , Li, Ya-Jing , He, Yingchun et al. Membrane-free sequential paired electrosynthesis of 1,4-hydroquinone from phenol over a self-supported electrocatalytic electrode [J]. | INDUSTRIAL CHEMISTRY & MATERIALS , 2024 . |
| MLA | Zhang, Wei-Ling et al. "Membrane-free sequential paired electrosynthesis of 1,4-hydroquinone from phenol over a self-supported electrocatalytic electrode" . | INDUSTRIAL CHEMISTRY & MATERIALS (2024) . |
| APA | Zhang, Wei-Ling , Li, Ya-Jing , He, Yingchun , Zhang, Shao , Li, Haohong , Zheng, Huidong et al. Membrane-free sequential paired electrosynthesis of 1,4-hydroquinone from phenol over a self-supported electrocatalytic electrode . | INDUSTRIAL CHEMISTRY & MATERIALS , 2024 . |
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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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间氨基苯磺酸钠是一种重要的化工中间体,可由多种方法制备得到,催化加氢法是目前主要使用的方法,但工业化报道较少,这是由于在间硝基苯磺酸钠加氢合成间氨基苯磺酸钠的液相反应中催化剂存在失活现象,难以多次套用,工业化成本高.使用自制Pd/C催化剂进行间硝基苯磺酸钠的液相加氢反应,采用液相色谱-四级杆飞行时间串联质谱(LC-QTOF-MS)、X射线衍射谱(XRD)、X射线光电子能谱(XPS)、BET表面分析等方法对Pd/C催化剂的失活原因进行探究,确定催化剂的失活原因.Pd/C催化剂的失活是由于在硝基选择性加氢过程中,原料间硝基苯磺酸钠转化为偶氮化合物或氧化偶氮化合物,由于这些中间体的吸附性较强,易堵塞活性炭载体的孔道,造成催化剂比表面积减少,导致催化剂暂时性的中毒失活,而并非是加氢还原了原料中磺酸基团生成硫化钯而导致的催化剂永久性失活.
Keyword ：
Pd/C催化剂 Pd/C催化剂 催化剂失活 催化剂失活 催化加氢 催化加氢 催化化学 催化化学 间硝基苯磺酸钠 间硝基苯磺酸钠
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| GB/T 7714 | 林知滨 , 郑辉东 , 范立海 et al. Pd/C催化剂在间硝基苯磺酸钠加氢反应中的应用 [J]. | 工业催化 , 2024 , 32 (10) : 56-62 . |
| MLA | 林知滨 et al. "Pd/C催化剂在间硝基苯磺酸钠加氢反应中的应用" . | 工业催化 32 . 10 (2024) : 56-62 . |
| APA | 林知滨 , 郑辉东 , 范立海 , 吴丹 . Pd/C催化剂在间硝基苯磺酸钠加氢反应中的应用 . | 工业催化 , 2024 , 32 (10) , 56-62 . |
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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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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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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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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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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 naturally occurring monosaccharide, is present in small quantities in nature. It is considered a valuable low-calorie sweetener due to its low absorption in the digestive tract and zero energy for growth. Most of the recent efforts to produce D-allulose have focused on in vitro enzyme catalysis. However, microbial fermentation is emerging as a promising alternative that offers the advantage of combining enzyme manufacturing and product synthesis within a single bioreactor. Here, a novel approach was proposed for the efficient biosynthesis of D-allulose from glycerol using metabolically engineered Escherichia coli. FbaA, Fbp, AlsE, and A6PP were used to construct the D-allulose synthesis pathway. Subsequently, PfkA, PfkB, and Pgi were disrupted to block the entry of the intermediate fructose-6-phosphate (F6P) into the Embden−Meyerhof−Parnas (EMP) and pentose phosphate (PP) pathways. Additionally, GalE and FryA were inactivated to reduce D-allulose consumption by the cells. Finally, a fed-batch fermentation process was implemented to optimize the performance of the cell factory. As a result, the titer of D-allulose reached 7.02 g/L with a maximum yield of 0.287 g/g. © 2024 Elsevier B.V.
Keyword ：
D-allulose D-allulose Escherichia coli Escherichia coli Fermentation Fermentation Metabolic engineering Metabolic engineering
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| GB/T 7714 | Guo, Q. , Dong, Z.-X. , Luo, X. et al. Engineering Escherichia coli for D-allulose biosynthesis from glycerol [J]. | Journal of Biotechnology , 2024 , 394 : 103-111 . |
| MLA | Guo, Q. et al. "Engineering Escherichia coli for D-allulose biosynthesis from glycerol" . | Journal of Biotechnology 394 (2024) : 103-111 . |
| APA | Guo, Q. , Dong, Z.-X. , Luo, X. , Zheng, L.-J. , Fan, L.-H. , Zheng, H.-D. . Engineering Escherichia coli for D-allulose biosynthesis from glycerol . | Journal of Biotechnology , 2024 , 394 , 103-111 . |
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