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Effects of internals on macroscopic fluid dynamics in a bubble column

Chinese Journal of chemical engineering 2025年第1期77卷 19-29页

作者： Shijie Liu Jin Liang Qin Li Hui Yu Haoliang Wang Xiangyang Li Chao Yang School of Chemical Engineering Sichuan UniversityChengdu 610065China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Petroleum Molecular&Process EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The effects of internals on liquid mixing and gas-liquid mass transfer have rarely been investigated in bubble columns,and the commonly used measurement method overestimates significantly overall gas ***,gas holdup measurement method is improved by conducting multi-point liquid level measurement and using net fluid volume instead of bed volume to calculate gas ***,a stable conductivity method for liquid macromixing has been established by shielding large bubbles using#16nylon ***,the influences of internal coverage(=12.6%,18.9% and 25.1%) on macroscopic fluid dynamics in a bubble column with a free wall area are systematically *** is found that the presence of internals has a notable effect on macroscopic fluid *** overall gas holdup and gas-liquid volumetric mass transfer coefficient decrease,and the macromixing time decreases with the increase of internal cross-sectional area *** are mainly caused by the uneven distribution of airflow due to the low resistance in the free wall *** design makes maintenance easier,but in reality,the reactor performance has *** improvements will be made to the reactor performance based on such a configuration through flow guidance using baffles.

关键词： Bubble column Internals Macroscopic fluid dynamics Mixing Mass transfer

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Fabrication of hydrophobic Pd/Al_(2)O_(3)-phosphoric acid via P-O-Al bond for liquid hydrogenation reaction

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Chinese Journal of chemical engineering 2023年第1期53卷 232-242页

作者： Lu Lv Min Zhao Yanan Liu Yufei He Dianqing Li State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical TechnologyBeijing 100029China

Alumina(Al_(2)O_(3))is widely used in the chemical industry as the catalyst and support due to its high specific surface area,abundant pore size distribution and chemical ***,the occurrence of hydration in water environment,result in outstanding decrease in specific surface area and collapse of pore *** this work,dodecyl phosphoric acid(PA)is used to modify the surface of Al_(2)O_(3)to obtain a series of hydrophobic material(Al_(2)O_(3)-PA).Based on XPS and NMR analysis,PA is chemically bonded on Al_(2)O_(3)to form PAOAAl ***,BET and WCA results display that Al_(2)O_(3)-1PA exhibits excellent the hydrophobicity and hydrothermal stability while maintains the pore *** it as the substrate to support the Pd nanoparticles,the as-prepared Pd/Al_(2)O_(3)-PA shows the superior catalytic performance in the hydrogenation of phenol and anthraquinone relative to Pd/Al_(2)O_(3),indicating the accessibility of Pd sites after PA ***,the significantly enhanced stability is also obtained in four cycles for aqueous phenol *** can be ascribed that the PA modification inhibits the aggregation of Pd nanoparticles and the products adhesion in the reaction *** extension of PA coatings to monolithic catalysts could expand their current capabilities in industrial applications and warrants ongoing investigation.

关键词： Alumina modification Hydrophobic catalyst Phenol hydrogenation Anthraquinone hydrogenation Accessible Pd sites

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Triple-conducting heterostructure anodes for electrochemical ethane nonoxidative dehydrogenation by protonic ceramic electrolysis cells

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Chinese chemical Letters 2025年第4期36卷 229-233页

作者： Yixin Lu Minghan Qin Shixian Zhang Zhen Liu Wang Sun Zhenhua Wang Jinshuo Qiao Kening Sun Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

In response to the increasing demand of ethylene,electrochemical ethane nonoxidative dehydrogenation(EENDH)to ethylene by protonic ceramic electrolysis cells(PCECs)is ***,existing anode materials exhibit poor proton conductivity and limited catalytic ***,a novel Sr_(1.95)Fe_(1.4)Co_(0.1)Mo_(0.4)Zr_(0.1)O_(6-δ)(SFCMZ)anode is prepared as PCECs anode for *** doping increases the oxygen vacancies and enhances the proton conductivity of ***,an alloy-oxide heterostructure(Co Fe@SFCMZ)is formed through in-situ exsolution of Co Fe alloy nanoparticles under reduction conditions,generating abundant oxygen vacancies and improving its catalytic *** Fe@SFCMZ cell achieves an electrolysis current density of 0.87 A/cm^(2) at 700℃ under 1.6 V,with an ethane conversion rate of 34.22%and corresponding ethylene selectivity of 93.4%.These results demonstrate that Co Fe@SFCMZ anode exhibits excellent electrocatalytic activity,suggesting promising applications for EENDH.

关键词： Protonic ceramic electrolysis cells Anode Ethylene Electrochemical ethane nonoxidative dehydrogenation Heterostructure

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Thermal stable Pt clusters anchored by K/TiO_(2)—Al_(2)O_(3)for efficient cycloalkane dehydrogenation

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Chinese Journal of chemical engineering 2024年第8期72卷 187-198页

作者： Zhendong Wang Bofeng Zhang Guozhu Liu Xiangwen Zhang Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Zhejiang Institute of Tianjin University Ningbo 315201China

Catalytic dehydrogenation of cycloalkanes is considered a valuable endothermic process for alleviating the thermal barrier issue of hypersonic ***,conventional Pt-based catalysts often face the severe problem of metal sintering under high-temperature ***,we develop an efficient K_(2)CO_(3)-modified Pt/TiO_(2)—Al_(2)O_(3)(K—Pt/TA)for cycloalkane *** optimized K—Pt/TA showed a high specific activity above 27.9 mol·mol^(-1)·s^(-1)(H_(2)/Pt),with toluene selectivity above 90.0%at 600℃with a high weight hourly space velocity of 266.4 h^(-1).The introduction of alkali metal ions could generate titanate layers after high-temperature hydrogen reduction treatment,which promotes the generation of oxygen vacancy defects to anchored Pt *** addition,the titanate layers could weaken the surface acidity of catalysts and inhibit side reactions,including pyrolysis,polymerization,and isomerization ***,this work provides a modification method to develop efficient and stable dehydrogenation catalysts under high-temperature conditions.

关键词： Cycloalkane dehydrogenation Pt clusters Oxygen vacancy defects Coking Stability Deactivation

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A novel septenary high-entropy(oxy)hydroxide electrocatalyst for boosted oxygen evolution reaction

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Journal of Materiomics 2024年第2期10卷 348-354页

作者： Lingjie Zhang Fangshi Fan Xiaomin Song Weiwei Cai Jie Ren Hui Yang Ningzhong Bao State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouZhejiang310027China State Key Laboratory of Material-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjingJiangsu210009China

High-entropy materials(HEMs)have attracted extensive attention in the field of electrochemical catal-ysis due to their unique ***,the preparation of high-entropy catalysts typically relies on high-temperature,energy-intensive,and time-consuming synthesis methods due to their compositional *** this study,a facile low-temperature electrochemical reconstruction approach is adopted to synthesize Ag-decorated septenary Co-Cu-Fe-Mo-Zn-Ag-Ru high-entropy(oxy)hydroxide electro-catalysts for oxygen evolution reaction(OER).By introducing Ag and Ru elements and implanting Ag nanoparticles to co-regulate the electronic structure of the catalysts,the as-prepared catalyst achieves remarkable OER performance with a low overpotential of 298 mV at 100 mA/cm^(2)and a small Tafel slope of 30.1 mV/dec in 1 mol/L *** work offers a valuable strategy for developing high-performance high-entropy OER electrocatalysts.

关键词： High-entropy materials Septenary metallic(oxy)hydroxide Oxygen evolution reaction Electrochemical reconstruction Oxygen vacancy

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An Ion-Channel-Reconstructed Water/Organic Amphiphilic Quasi-Solid-state Electrolyte for High-Voltage Energy Storage Devices

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CCS Chemistry 2025年第2期7卷 470-483页

作者： Zekai Zhang Qian He Hengyi Wang Changwei Liu Hongchun Mu Haiping Su Xia Han Honglai Liu Cheng Lian State Key Laboratory of Chemical Engineering School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237

Quasi-solid-state electrolytes(QSSEs)have gar-nered significant attention due to combining the dynamic properties of liquid electrolytes and the high safety of solid-state ***,the limited electrochemical stability window(ESW)of liquid electrolytes and the low conductivity of the polymer matrix seriously constrain practical ***,an ant-nest electrospun amphiphilic polyurethane-based gel electrolyte(eAPG)with hy-drophilic ion channels in an organic polyurethane matrix was synthesized by swelling electrospun amphiphilic polyurethane(eAP)membrane in NaClO_(4)-based trimethyl phosphate aqueous *** dynamically reconstructed hydrophilic ion channels enhance the Na^(+)transport rate five times compared to that in the polymer hydrophobic regions,which leads to a remarkable ion conductivity of 23.6 mS cm^(−1).The transport of free water in QSSEs via the Grotthuss mechanism is intimately associated with the ESW,where the eAP cross-linked network diminished the activity of free water,resulting in an increased ESW of 2.3 ***,symmetric supercapacitors assembled by eAPG and activated carbon electrode exhibit 45.32 Wh kg^(−1)at a power density of 0.933 kW kg^(−1)with stable and long-term *** rational electrolyte design strategy and remarkable electrochemical performance pave the way for the next generation of energy storage devices.

关键词： quasi-solid-state electrolyte energy stor-age devices hydrophilic-hydrophobic equilibrium ion-confinement transport hydrogen bonding net-work solvation structure

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Biomass-enhanced Janus sponge-like hydrogel with salt resistance and highstrength for efﬁcient solar desalination

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Green Energy & Environment 2024年第11期9卷 1698-1710页

作者： Aqiang Chu Meng Yang Juanli Chen Jinmin Zhao Jing Fang Zhensheng Yang Hao Li National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin300401China

Interfacial solar-driven evaporation technology shows great potential in the ﬁeld of industrial seawater desalination, and the development ofefﬁcient and low-cost evaporation materials is key to achieving large-scale applications. Hydrogels are considered to be promising candidates;however, conventional hydrogel-based interfacial solar evaporators have difﬁculty in simultaneously meeting multiple requirements, including ahigh evaporation rate, salt resistance, and good mechanical properties. In this study, a Janus sponge-like hydrogel solar evaporator (CPAS) withexcellent comprehensive performance was successfully constructed. The introduction of biomass agar (AG) into the polyvinyl alcohol (PVA)hydrogel backbone reduced the enthalpy of water evaporation, optimized the pore structure, and improved the mechanical properties. Meanwhile, by introducing hydrophobic fumed nano-silica aerogel (SA) and a synergistic foaming-crosslinking process, the hydrogel spontaneouslyformed a Janus structure with a hydrophobic surface and hydrophilic bottom properties. Based on the reduction of the evaporation enthalpy andthe modulation of the pore structure, the CPAS evaporation rate reached 3.56 kg m^(-2) h^(-1) under one sun illumination. Most importantly, owingto the hydrophobic top surface and 3D-interconnected porous channels, the evaporator could work stably in high concentrations of salt-water(25 wt% NaCl), showing strong salt resistance. Efﬁcient water evaporation, excellent salt resistance, scalable preparation processes, and low-costraw materials make CPAS extremely promising for practical applications.

关键词： Solar interfacial evaporation Hydrogel Biomass Desalination Salt resistance

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A dynamic control structure of liquid-only transfer stream distillation column

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Chinese Journal of chemical engineering 2023年第7期59卷 135-145页

作者： Borui Liu Tao Zhang Yi Zheng Kailong Li Hui Pan Hao Ling State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power College of Environmental and Chemical EngineeringShanghai University of Electric PowerShanghai 200090China

The intention of this fundamental work is to explore the manipulation of a mixture of benzene,toluene and o-xylene separated from liquid-only transfer divided-wall column(LTS-DWC).First,two control structures are clearly proposed,including seven component control loops(CS1)and seven temperature control loops(CS2).However,two control structures can handle ±10% feed disturbances rather than larger feed ***,an equivalent four-column model by introducing withdraw ratio is developed to discuss the effect of two liquid-only side-stream on the overall reboiler *** is indicated that the second liquid-only side-stream withdraw ratio strongly affects the overall energy ***,six-component control loops within the fixed second liquid-only side-stream withdraw ratio(CS3)is proposed and the purity of products returns to set value even as facing ±20% feed ***,based on the above results,it is established a temperature control structure(CS4)for controlling fixed second liquid-only side-stream withdraw ratio,which can cope with ±15% *** by these findings,an insight into the dynamic control of LTS-DWC promotes the industrial implementation of DWC through new liquid-only side-stream configurations.

关键词： Separation Divided-wall column Liquid-only transfer stream Optimal design Dynamic modeling

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Metal size effects over metal/zeolite bifunctional catalysts in the selective hydroalkylation of benzene

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Frontiers of chemical Science and engineering 2024年第4期18卷 107-114页

作者： Junjie Li Chuang Liu Zhenlong Jia Yingchun Ye Dawei Lan Wei Meng Jianqiang Wang Zhendong Wang Yongfeng Hu Weimin Yang State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Sinopec Shanghai Research Institute of Petrochemical Technology Co.Ltd.Shanghai 201208China School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

Bifunctional metal/zeolite materials are some of the most suitable catalysts for the direct hydroalkylation of benzene to *** overall catalytic performance of this reaction is strongly influenced by the hydrogenation,which is dependent on the metal ***,systematically investigating the metal size effects in the hydroalkylation of benzene is *** this work,we successfully synthesized Ru and Pd nanoparticles on Sinopec Composition Materials No.1 zeolite with various metal *** demonstrated the size-dependent catalytic activity of zeolite-supported Ru and Pd catalysts in the hydroalkylation of benzene,which can be attributed to the size-induced hydrogen spillover capability *** work presents new insights into the hydroalkylation reaction and may open up a new avenue for the smart design of advanced metal/zeolite bi-functional catalysts.

关键词： size effects bifunctional catalysts metal/zeolite hydroalkylation

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Tandem hydroalkylation and deoxygenation of lignin-derived phenolics to synthesize high-density fuels

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Chinese Journal of chemical engineering 2024年第2期66卷 104-109页

作者： Rui Yu Zhensheng Shen Yanan Liu Chengxiang Shi Juncong Qu Lun Pan Zhenfeng Huang Xiangwen Zhan g Ji-Jun Zou Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Lignin is the most abundant naturally phenolic biomass,and the synthesis of high-performance renewable fuel from lignin has attracted significant *** propose the efficient synthesis of high-density fuels using simulated lignin cracked oil in tandem with hydroalkylation and deoxygenation ***,we investigated the reaction pathway for the hydroalkylation of phenol,which competes with the hydrodeoxygenation form *** then,we investigated the effects of metal catalyst types,the loading amount of metallic,acid dosage,and reactant ratio on the reaction *** phenol hydroalkylation and hydrodeoxygenation were balanced when 180℃ and 5 MPa H_(2)with the alkanes yield of 95%.By extending the substrate to other lignin-derived phenolics and simulated lignin cracked oil,we obtained the polycyclic alkane fuel with high density of 0.918 g·ml^(-1)and calorific value of41.2 MJ·L^(-1).Besides,the fuel has good low-temperature properties(viscosity of 9.3 mm^(2)·s^(-1)at 20℃ and freezing point below-55℃),which is expected to be used as jet *** work provides a promising way for the easy and green production of high-density fuel directly from real lignin oil.

关键词： High-density fuel Biofuel Hydrogenation Alkylation Lignin Phenolics

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