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Enhancement of liquid-liquid micromixing performance in curved capillary microreactor by generation of Dean vortices

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Chinese Journal of Chemical Engineering 2024年第4期68卷 76-82页

作者： Shaoyun Wu Zhuang Ma Zichi Yang Suying Zhao Caijin Zhou huidong zheng Fujian Engineering Research Center of Advanced Manufacturing Technology for Fine Chemicals College of Chemical EngineeringFuzhou UniversityFuzhou 350108China Qingyuan Innovation Laboratory Quanzhou362114China

Micromixing efficiency is an important parameter for evaluating the multiphase mass transfer performance and reaction efficiency of *** 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 *** Villermaux-Dushman probe reaction was employed to characterize the micromixing performance in different curved capillary *** effects of experiment parameters such as liquid flow rate,inner diameter,tube length,and curve diameter on micromixing performance were systematically *** the optimal conditions,the minimum value of the segmentation factor XS was *** 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 XS reduced by 37.5%.Further,the correlations of segment index XS with dimensionless factor such as Reynolds number or Dean number were developed,which can be used to predict the liquid-liquid micromixing performance in capillary microreactors.

关键词： Microreactor Process intensification Micromixing performance Dean flow

Styrene epoxidation catalyzed by polyoxometalate/quaternary ammonium phase transfer catalysts: The effect of cation size and catalyst deactivation mechanism

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Chinese Journal of Chemical Engineering 2023年第3期55卷 192-201页

作者： Qiongna Xiao Yuyan Jiang Weiqiang Yuan Jingjing Chen Haohong Li huidong zheng College of Chemical Engineering Fuzhou UniversityFuzhou 350116China Qingyuan Innovation Laboratory Quanzhou 362801China Engineering Research Center of Advanced Manufacturing Technology for Fine Chemicals Fujian Province UniversityFuzhou UniversityFuzhou 350116China College of Chemistry Fuzhou UniversityFuzhou 350116China

Catalytic epoxidation of alkenes is an important type of organic reaction in chemical industry,and the deep insight into catalyst deactivation will help to develop new epoxidation *** this work,series of quaternary ammoniums bearing different cationic sizes,***+(methyltrioctylammonium,[(C_(8)H_(17))_(3)CH_(3)N]+),HTMA+(hexadecyltrimethylammonium,[(C_(16)H_(33))(CH_(3))_(3)N]+) and DMDOA+(dimethyldioctadecylammonium,[(C_(18)H_(37))_(2)(CH_(3))_(2)N]+) were incorporated with polyoxometalate (POM) anions to prepare phase transfer catalysts (PTCs),which were used in the styrene *** them,(MTOA)_(3)PW_(4)O_(24)exhibits the best catalytic performance judged from the highest styrene conversion rate(52%) and styrene oxide selectivity (93%),during which the styrene epoxidation conditions were ***,the deactivation mechanism of this kind of PTCs was proposed firstly,*** the case of low H_(2)O_(2) content,the oxidant can only be used in the styrene epoxidation,in which the catalyst can transform into stable Keggin-type *** when the content of H_(2)O_(2) is higher,the excess H_(2)O_(2) can reactivate the Keggin-type POM into active (PW_(4)O_(24))_(3)-anions,which can trigger the ring-opening polymerization of styrene ***,the catalyst is deactivated by adhered poly(styrene oxide)irreversibly,which was determined by NMR *** this situation,the active moiety{PO_(4)[WO(O_(2))_(2)]_(4)}_(3)-in phase-transfer catalytic system can break into some unidentified species with low W/P ratio with the presence of *** work will be beneficial for the design of new PTCs in alkene epoxidation in fine chemical industry.

关键词： Phosphotungstic acid phase-transfer catalyst Styrene epoxidation Catalyst deactivation mechanism Cation size effect

Phosphorous-Modified Carbon Nanotube-Supported Pt Nanoparticles for Propane Dehydrogenation Reaction

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China Petroleum Processing & Petrochemical Technology 2019年第1期21卷 7-14页

作者： Liu Jie Liu Changcheng Da Zhijian zheng huidong College of Chemical Engineering Fuzhou University SINOPEC Research Institute of Petroleum Processing

The sintering of Pt nanoparticles is one of the main reasons for catalyst deactivation during the high-temperature propane dehydrogenation(PDH) reaction. Promoters and supports have been introduced to prolong the catalyst ***, it is still necessary to develop novel catalysts with robust stability. Herein, the phosphorus-modified carbon nanotube-supported Pt nanoparticles were employed for the PDH process. Phosphorus modification improves the Pt dispersion, effectively promoting the activity of Pt/P-CNTs. Additionally, the phosphorus-modified CNTs can interact strongly with Pt nanoparticles by improving the electron transfer or hybridization, stabilizing Pt nanoparticles from agglomeration, and significantly enhancing the catalyst stability.

关键词： propane dehydrogenation phosphorus-modified carbon nanotubes platinum catalyst strong metal-support interactions

Influence of Dechlorination Temperature on Propane Dehydrogenation over Pt-θ-Al2O3

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China Petroleum Processing & Petrochemical Technology 2018年第4期20卷 1-7页

作者： Liu Jie Liu Changcheng Ma Aizeng Da Zhijian zheng huidong College of Chemical Engineering Fuzhou UniversityFuzhou 350116 SINOPEC Research Institute of Petroleum Processing Beijing 100083

Several Pt-θ-Al_2O_3 catalysts with similar ultra-low Cl contents were used to investigate the influence of dechlorination temperature on propane dehydrogenation reaction. The Pt-θ-Al_2O_3 catalyst treated at a highest dechlorination temperature showed a lowest propane rate and propylene selectivity. The scanning transmission electron microscopy showed that the dispersions of Pt nanoparticles decreased with an increasing dechlorination temperature. The temperature-programmed reduction analysis showed that higher dechlorination temperature could lead to strong interactions between the metal and support, making it difficult to reduce Pt nanoparticles. The temperature-programmed oxidation analysis implied that more coke was deposited on the metal for catalyst treated at higher dechlorination temperature. The Raman spectra and the H/C ratio showed that more side-reactions, such as cracking and severe deep dehydrogenation reactions, occurred on catalysts treated at higher dechlorination temperatures. Therefore, the lower the dispersion of Pt nanoparticles was, the stronger the metal-support interactions and increased side-reactions would be, resulting in lower catalytic activity for Pt-θ-Al_2O_3 treated with higher dechlorination temperature.

关键词： dechlorination temperature metal-support interactions θ-Al2O3 Pt nanoparticles propane dehydrogenation reaction

History of the Dalian Institute of Chemical Physics and the Friendship between China and Japan in catalysis

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Chinese Journal of Catalysis 2019年第11期40卷 1591-1614页

作者： S. Ted Oyama Qin Xin Guoxing Xiong Wenjie Shen Jie Xu Hongmei Yin Youzhu Yuan Haichao Liu huidong zheng School of Chemical Engineering Fuzhou University Fuzhou 350108 Fujian China The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China State Key Laboratory of Physical Chemistry of Solid Surfaces iChEM National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 Fujian China Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

This article presents a history of the origins of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences (Abbreviated as DICP) and relates the recent friendship between China and Japan in the field of catalysis. Although the official beginning of DICP is in 1949 with the birth of the People’s Republic of China, there are earlier roots that went back to the defeat of Russia by Imperial Japan in 1905. This began a period of occupation and exploitation of Northest Asia by Japan which did not end until its defeat by Allied forces in 1945. During the period of occupation, a laboratory was created called the Central Research Laboratory of the South Manchurian Railroad Company, which was staffed by the best and brightest researchers from Japan, and was able to develop new processes in chemicals and synthetic fuels that fed the Japanese Imperial forces. Between 1945 and 1949, Dalian was administered by the Soviet Union, and the removable equipment from the Laboratory was taken. In this period one individual stood out, the Laboratory Director Marusawa Tsuneya, who risked his life to preserve the scientific records and staff of the institute, and then stayed in Dalian for ten years after the Second World War to help China rebuild its capabilities. The Central Research Laboratory is still preserved as the Old Campus of *** origin of the friendship between China and Japan in catalysis can be traced to Professor Morikawa Kiyoshi, who worked in the Central Research Laboratory and helped commercialize a shale coal liquefaction process. Upon his return to Japan he became Professor at the Tokyo Institute of Technology and in 1975 organized the first visit by Japanese academics to China. This was reciprocated in visits to Japan in 1977 and 1980 by top researchers such as Zhang Dayu, Min Enze, Tsai Khirui, Lu Jiaxi, and Lin Liwu. This resulted in numerous contacts between individuals, which multiplied geometrically. Notably among these were the personal interaction

关键词： went back a period of dicp

4种拟除虫菊酯类农药对海带生长及叶绿素a含量的影响

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应用海洋学学报 2022年第4期41卷 663-670页

作者：郑惠东福建省水产研究所、福建省海洋生物增养殖与高值化利用重点实验室福建厦门361013

为研究不同拟除虫菊酯类农药对海带(Laminaria japonica)生长和叶绿素a(Chl a)含量的影响,选取溴氰菊酯、联苯菊酯、氰戊菊酯、醚菊酯等4种拟除虫菊酯类农药,设置1、5、10、50、100、500μg/dm^(3)6个梯度对海带进行半静置染毒。结果表... 详细信息

为研究不同拟除虫菊酯类农药对海带(Laminaria japonica)生长和叶绿素a(Chl a)含量的影响,选取溴氰菊酯、联苯菊酯、氰戊菊酯、醚菊酯等4种拟除虫菊酯类农药,设置1、5、10、50、100、500μg/dm^(3)6个梯度对海带进行半静置染毒。结果表明:低浓度(1μg/dm^(3))组4种拟除虫菊酯类农药对海带生长均具有促进作用(P联苯菊酯>溴氰菊酯。低浓度(1、5μg/dm^(3))组海带体内Chl a含量均出现升高,具有一定促进作用(P氰戊菊酯>联苯菊酯>溴氰菊酯。4种拟除虫菊酯类农药对海带生长和Chl a含量的影响均表现为低浓度促进、高浓度抑制作用,且随着浓度升高和暴露时间延长,呈促进作用减弱,抑制作用增强之势。

关键词：海洋生物学海带拟除虫菊酯类农药生长叶绿素a

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二氢月桂烯水合工艺的研究进展

化工进展 2013年第12期32卷 2967-2972,2996页

作者：陈晶晶郑辉东福州大学化学化工学院福建福州350108

二氢月桂烯醇(DHMOH)是当前国际上最常用的大宗香料之一,其主要生产方法是通过二氢月桂烯(DHM)水合而成。本文介绍了由DHM生成DHMOH的两种方法:间接水合法和直接水合法近年来的研究情况,对其各自的优缺点和相关研究进展进行了综述。直... 详细信息

二氢月桂烯醇(DHMOH)是当前国际上最常用的大宗香料之一,其主要生产方法是通过二氢月桂烯(DHM)水合而成。本文介绍了由DHM生成DHMOH的两种方法:间接水合法和直接水合法近年来的研究情况,对其各自的优缺点和相关研究进展进行了综述。直接水合法以其对环境危害小、设备投资小、易连续生产等优点,是近年来的研究重点。针对直接水合法研究中主要存在的溶剂用量大、分离能耗高等问题,介绍了一些在新溶剂、新工艺方向的研究进展。其中,离子液体、超临界CO2等新型溶剂以其溶解度好、易分离等优点,在烯烃水合方面具有很好的应用前景。莰烯、α-蒎烯等与DHM结构类似的烯烃,其参与水合过程的反应机理与DHM相似,因此这些烯烃水合方面的研究常常可以互相借鉴。

关键词：二氢月桂烯二氢月桂烯醇直接水合法间接水合法

基于Galton板的固定床内示踪剂浓度分布

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化工学报 2013年第12期64卷 4283-4289页

作者：王碧玉黄智贤郑辉东邱挺福州大学化学化工学院福建福州350108

从概率论角度出发,利用传统的Galton板模型,以催化剂捆扎包内的一个小布袋为研究对象,建立了固定床内示踪剂浓度分布模型,得到了固定床内示踪剂浓度分布模型的具体表达式。同时,以KCl溶液为示踪剂,建立了实验装置,将模型计算值与实验结... 详细信息

从概率论角度出发,利用传统的Galton板模型,以催化剂捆扎包内的一个小布袋为研究对象,建立了固定床内示踪剂浓度分布模型,得到了固定床内示踪剂浓度分布模型的具体表达式。同时,以KCl溶液为示踪剂,建立了实验装置,将模型计算值与实验结果比较,结果吻合良好,说明所建模型是可靠的。考察不同参数对示踪剂浓度分布的影响,结果表明:在固定床内,随着催化剂粒径的增大、液体喷淋量的减小、固定床高度的增加,示踪剂浓度分布曲线逐渐变得平缓。

关键词：固定床 Galton板浓度分布

Ag-O-N共掺杂闪锌矿ZnS光催化性质的第一性原理研究

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材料导报 2021年第18期35卷 18012-18017,18023页

作者：吴方棣胡家朋杨自涛郑辉东武夷学院福建省生态产业绿色技术重点实验室武夷山354300 福州大学石油化工学院福州350108

采用第一性原理方法计算比较了Ag、O和N单掺杂、Ag-O和Ag-N二元掺杂以及Ag-O-N三元共掺杂闪锌矿ZnS的晶型结构、电荷分布、能带和态密度以及光学特性。N、O对晶格结构的影响大于Ag,结构优化和电荷分布结果显示晶格畸变随着掺杂组分的增... 详细信息

采用第一性原理方法计算比较了Ag、O和N单掺杂、Ag-O和Ag-N二元掺杂以及Ag-O-N三元共掺杂闪锌矿ZnS的晶型结构、电荷分布、能带和态密度以及光学特性。N、O对晶格结构的影响大于Ag,结构优化和电荷分布结果显示晶格畸变随着掺杂组分的增多不断增大。形成能计算表明,N最易掺杂,组分越多,掺杂越难实现。Ag、O和N各组分掺杂ZnS后能带间隙均有所减小,Ag、N掺杂ZnS更有利于价带顶上移,部分能带越过费米能级,形成电子跃迁的过渡能级,有利于光催化反应。Ag-O-N三元掺杂ZnS后在可见光区的吸收峰最大,有利于提高ZnS对可见光的利用率。

关键词： Ag-O-N 共掺杂ZnS 电子结构光催化第一性原理