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green chemical engineering 2023年第3期4卷 338-345页

作者： Weizhong Zheng Jialei Sha Weizhen Sun Ling Zhao state key laboratory of chemical engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai200237China

Benzene alkylation catalyzed by immobilized ionic liquids(ILs)on solid carriers is considered as a heterogeneous reaction,in which the interfacial properties play an important role.Hence,the interfacial characteristics between benzene/1-dodecene mixture and immobilized chloroaluminate ILs with different alkyl chain length on the silica substrate were investigated by molecular dynamics simulation.The grafted ILs can obviously promote the enrichment of benzene near the interface,leading to a higher ratio of benzene to dodecene,and the interfacial width increases slightly with increased alkyl chain of grafted cations.At the same time,the grafted cations can also enhance the benzene diffusion and suppress the dodecene diffusion at the interface,which probably helps to inhibit the inactivation of catalysts.This work provides deeply insights into the rational design of novel immo-bilized ILs catalysts for the benzene alkylation.

关键词： Benzene alkylation Interfacial property Molecular dynamics simulation Immobilized ionic liquids

Study on Strength Reduction Law and Meso-Crack Evolution of Lower Layered Cemented Tailings Backfill

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Journal of Renewable Materials 2023年第3期11卷 1513-1529页

作者： Huazhe Jiao Wenxiang Zhang Yunfei Wang Xinming Chen Liuhua Yang Yangyang Rong state Collaborative Innovation Center of coal Work Safety and Clean-efficiency utilization School of Civil EngineeringHenan Polytechnic UniversityJiaozuo454003China Provincial key laboratory of Underground engineering and Disaster Prevention and Control School of Civil EngineeringHenan Polytechnic UniversityJiaozuo454003China School of Civil engineering Henan Polytechnic UniversityJiaozuo454003China

The green disposal of tailings solid waste is a problem to be solved in mine production.Cemented tailings filling stoping method can realize the dual goals of solid waste resource utilization and mined-out area reduction.However,the volume of the mined-out area of the open-pit method is larger than the filling capacity,resulting in the complex stratification of the underground backfill,and the strength of the backfill cannot meet the requirements.In this paper,according to the delamination situation,the specimens of horizontal and inclination angle layered cemented tailings backfill(LCTB)is made for a uniaxial compression test,and the failure process of delamination backfill is reduced by PFC.The results show that the corresponding reduction factorφof horizontal LCTB is 0.560–0.932,and the correspondingφvalue of inclination angle LCTB is 0.338–0.772.The failure mode of backfill in different layers is mainly manifested as a tensile failure.The PFC numerical simulation results are consistent with laboratory test results,which verifies the correctness of backfill failure.The research results provide a reliable theoretical basis for the strength design of backfill in goaf,which is of great significance for solid waste utilization and environmental protection.

关键词： Solid wastes recycling LCTB uniaxial compression strength reduction granular flow

EDA-assisted synthesis of multifunctional snowflake-Cu_(2)S/CdZnS S-scheme heterojunction for improved the photocatalytic hydrogen evolution

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Journal of Materials Science & Technology 2022年第26期121卷 28-39页

作者： Guorong Wang Yongkang Quan Kaicheng Yang Zhiliang Jin School of Chemistry and chemical engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan 750021China

The charge separation efficiency is one of the main factors affecting the solar photocatalytic decomposition of water to produce hydrogen.Constructing a unique heterojunction can accelerate the separation and transfer of photo-generated charges,and effectively improve the photocatalytic efficiency,which is considered a potential strategy.Accordingly,the 2%Cu_(2)S/CZS step-scheme(S-scheme)heterojunction based on morphology and electronic structure was successfully prepared via simple hydrothermal method.Compared with the monomer Cu_(2)S and Cd Zn S,the hydrogen evolution rate of 2%Cu_(2)S/CZS samples is significantly increased.In particular,the 2%Cu_(2)S/CZS not only shows high hydrogen evolution rate of 5904μmol g^(-1)h^(-1)(3.19 times than original Cd Zn S),but also presents preferable cyclic endurance.According to the characterization,we believe that the introduction of Cu_(2)S has the following three advantages:(i)The snowflake structure of Cu_(2)S reduces the agglomeration of granular Cd Zn S.(ii)The Cu_(2)S with narrow band gap broadens the light response range of the composite catalyst.(iii)The Cu_(2)S was introduced into Cd Zn S to form S-scheme heterojunction,which accelerated the separation and transfer of photo-generated charge.This work broadens the idea of designing efficient photocatalyst of hydrogen evolution.

关键词： S-scheme Heterojunction Multifunctional Snowflake-Cu_(2)S Photocatalyst

Magic of hydrogen spillover: Understanding and application

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green Energy & Environment 2022年第6期7卷 1161-1198页

作者： Haifang Shen Hao Li Zhensheng Yang Chunli Li National-Local Joint engineering laboratory for Energy Conservation in chemical Process Integration and Resources utilization Tianjin Key Laboratory of Chemical Process SafetySchool of Chemical Engineering and TechnologyHebei University of Technology8 Guangrong RoadTianjin300130China

The hydrogen spillover effect(HSPE)plays an important role in heterogeneous catalysis and hydrogen storage as an interfacial phenomenon,which facilitates the improvement of hydrogen storage properties of porous nanomaterials and indirectly or directly affects the reaction performance of multiphase catalytic reactions.The setting-up of the word“hydrogen spillover”opened up a new area to gain insight into the dynamic behavior of migrating hydrogen atoms on a catalyst surface.However,a comprehensive understanding of the HSPE is still lacking.Today,the development of advanced characterization techniques provides increasingly valuable information to further our understanding of the HSPE.Based on these considerations,in this review,we hope to provide some answers to the question“What is hydrogen spillover and how do we recognize it?”.To do this,we will rely on advanced characterization techniques as well as experimental and theoretical studies.Then,we discuss in detail the influences of the HSPE on hydrogen storage performance and the important catalytic effects of the HSPE in catalysis.These effects will be reviewed by looking through the catalytic results obtained in many reactions in thermal catalysis,electrocatalysis,and photocatalysis.Furthermore,based on the application potential of hydrogen spillover,we present some preliminary research proposals and discuss the opportunities and challenges that remain to be faced in this research area.

关键词： Hydrogen spillover Characterization Hydrogen storage Catalysis Spillover mechanism

Sprayed separation membranes: A systematic review and prospective opportunities

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green Energy & Environment 2022年第6期7卷 1143-1160页

作者： Guangjin Zhao Wenjing Han Liangliang Dong Hongwei Fan Zhou Qu Jiahui Gu Hong Meng College of chemical engineering Beijing University of Chemical TechnologyBeijing100029China key laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China state key laboratory of Chemistry and utilization of Carbon Based Energy Resources College of ChemistryXinjiang UniversityUrumqi830017XinjiangChina

Membrane separation technology has been taken up for use in diverse applications such as water treatment,pharmaceutical,petroleum,and energy-related industries.Compared with the design of membrane materials,the innovation of membrane preparation technique is more urgent for the development of membrane separation technology,because it not only affects physicochemical properties and separation performance of the fabricated membranes,but also determines their potential in industrialized application.Among the various membrane preparation methods,spray technique has recently gained increasing attention because of its low cost,rapidity,scalability,minimum of environmental burden,and viability for nearly unlimited range of materials.In this Review article,we summarized and discussed the recent developments in separation membranes using the spray technique,including the fundamentals,important features and applications.The present challenges and future considerations have been touched to provide inspired insights for developing the sprayed separation membranes.

关键词： Membrane separation technology Membrane preparation technique Spray technique Scalability Industrialized application

Retention of trace elements in coal-fired flue gas by a novel heterogeneous agglomeration technology

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Journal of Environmental Sciences 2023年第3期125卷 234-243页

作者： Yushan Ji Xiangzheng Cui Jingchao Liu Tianle Zhang Shuzhou Wei Junfeng Zhang Yongchun Zhao Junying Zhang state key laboratory of coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China National Environmental Protection engineering Technology Center for Trace Elements Pollution Control and Low Carbon utilization of coal Wuhan 430074China Sanhe Power Generation Co.Ltd Sanhe 065201China Hebei coal-fired Power Station Pollution Control Technology Innovation Center Sanhe 065201China

Heterogeneous agglomeration (HA) is a very potential technology for coal-fired flue gas treatment.In this paper,the distribution and migration mechanisms of trace elements (TEs such as Se,As and Pb in CFPPs were studied on a 30,000 m^(3)/hr pilot-scale experimental plat form.The influences of HA on the removal efficiency of gaseous and particulate TEs were well analyzed.The results showed that Se,As and Pb were enriched in fly ash,and their sen sitivity to particle size is quite different.The content of Se was the highest in PM1,reaching193.04 mg/kg at the electrostatic precipitator (ESP) outlet.The average particle size of the total dust before ESP increased significantly from 21.686 to 62.612μm after injecting the heterogeneous agglomeration adsorbent,conducive to its further removal by ESP.In addi tion,the concentrations of gaseous Se,As and Pb in the flue gas decreased after adsorben spray,and accordingly,their contents in the hierarchical particles increased,indicating tha the adsorbent could effectively promote the adsorption of gaseous trace elements in fly ash and reduce the possibility of their escape to the atmosphere.Total concentrations of Se,As and Pb emitted by wet flue gas desulfurization (WFGD) are 0.223,0.668 and 0.076μg/m^(3)which decreased by 59.98%,47.69%and 90.71%,respectively.Finally,a possible HA mecha nism model was proposed,where chemical adsorption,physical condensation and collision agglomeration of gaseous TEs and fine particles with adsorbent droplets occurred to form larger agglomerates.

关键词： Heterogeneous agglomeration Hazardous trace elements Particulate matter Flue gas Pilot experiments

Liquid-phase esterification of methacrylic acid with methanol catalyzed by cation-exchange resin in a fixed bed reactor:Experimental and kinetic studies

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Chinese Journal of chemical engineering 2023年第6期58卷 1-10页

作者： Junyang Liu Luming Wang Yuhang Bian Chunshan Li Zengxi Li Jie Li School of chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing key laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Langfang Technological Center of green Industry Langfang 065801China

The kinetic behavior of esterification between methacrylic acid and methanol catalyzed by NKC-9 resin was studied in a fixed bed reactor.The reaction was conducted in the temperature range of 323.15 to 368.15 K with the molar ratio of reactants from 0.8 to 1.4 under certain pressure.The measurement data were regression with the pseudo-homogeneous(P-H),Eley-Rideal(E-R),and Langmuir-Hinshelwood(L-H)heterogeneous kinetic models.Independent adsorption experiments were implemented to gain the adsorption equilibrium constants of four components.Among the above three models,the L-H model exhibited the best fitting results.The stability of NKC-9 was evaluated by long-term running with the yield of methyl methacrylate no decrease during 3000 h operation.The structure and physicochemical properties of the new and used catalyst were performed by several characterizations including thermogravimetric analysis(TG),scanning electron microscope(SEM),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR)and so on.

关键词： Kinetics Esterification Methyl methacrylate Cation-exchange resin Fix bed reactor

Graphdiyne(C_(n)H_(2n-2)based CuI-GDY/ZnAl LDH double S-scheme heterojunction proved with in situ XPS for efficient photocatalytic hydrogen production

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Journal of Materials Science & Technology 2023年第24期155卷 132-141页

作者： Tian Wang Zhiliang Jin School of Chemistry and chemical engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan 750021China

The photocatalytic performance can be significantly improved by constructing suitable heterojunction photocatalysts.It is well known that graphdiyne possesses a unique conjugated carbon network nanostructure,which gives it ample active sites on its surface and facilitates the reduction of protons.In this study,a unique new double S-scheme heterojunction photocatalyst was constructed by simple self-assembly of GDY prepared via organic synthesis methods and ZnAl-LDH.According to the study,an internal electric field controlling the transfer direction of the electron hole is formed between the interface of CuI-GDY and ZnAl-LDH,which broadens the light absorption range of the catalyst and improves the redox ability of the photocatalytic system.CuI-GDY and ZnAl-LDH are tightly bound together,which helps to separate the photogenerated carriers while preserving the strong reduction electrons in the GDY conduction band and the strong oxidation holes in the ZnAl-LDH valence band so that they can fully participate in the redox reaction.The charge-transfer paths on the S-scheme heterojunction interface were analyzed by in situ irradiation XPS.This work provides an effective strategy for the construction of double S-scheme heterojunction photocatalysts.

关键词： Conjugated carbon network Graphdiyne S-scheme heterojunction Hydrogen evolution

Enhanced catalytic conversion of polysulfides using high-percentage 1T-phase metallic WS_(2) nanosheets for Li–S batteries

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green Energy & Environment 2022年第6期7卷 1340-1348页

作者： Changyu Yang Ning Gong Tao Chen Yang Li Wenchao Peng Fengbao Zhang Xiaobin Fan School of chemical engineering and Technology State Key Laboratory of Chemical EngineeringCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin300072China

high-energy-density lithium-sulfur batteries has attracted substantial attention as competitive candidates for large-scale energy storage technologies.Still,the adverse“shuttle effect”and sluggish sulfur conversion reaction kinetics immensely obstruct their commercial viability.Herein,a two-dimensional metallic 1T phase WS_(2)(1T-WS_(2))nanosheets modified functional separator is developed to improve the electrochemical performance.Meanwhile,the semiconducting bulk-WS_(2) crystals,and 2H phase WS_(2)(2H-WS_(2))nanosheets with more basal-plane Svacancy defects are also prepared to probe the contributions of the crystal structure(phase),S-vacancy defects,and edges to the Li–S batteries performance experimentally and theoretically.In merits of the synergistic effect of high ion and electron conductivity,enhanced binding ability to lithium polysulfides(LiPSs),and sufficient electrocatalytic active sites,the 1T-WS_(2) shows highly efficient electrocatalysis of LiPSs conversion and further improves Li–S battery performance.As expected,thus-fabricated cells with 1T-WS_(2) nanosheets present superior cycle stability that maintain capacity decline of 0.039%per cycle after 1000 cycles at 1.0 C.The strategy presented here offers a viable approach to reveal the critical factors for LiPSs catalytic conversion,which is beneficial to developing advanced Li–S batteries with enhanced properties.

关键词： Li-S batteries Electrocatalysts Polysulfides WS_(2)

Directional preparation of naphthalene oil-rich tar from Beisu low-rank coal by low-temperature catalytic pyrolysis

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Carbon Resources Conversion 2020年第1期3卷 67-75页

作者： Tao Liu Xiuli Zhang Yongzhuo Liu Lingyun Wang Qingjie Guo key laboratory of Clean chemical engineering of Colleges and Universities of Shandong Province Qingdao University of Science and TechnologyQingdao 266042People’s Republic of China state key laboratory of high-efficiency utilization of coal and green chemical engineering Ningxia UniversityYinchuan 750021People’s Republic of China

Low-rank coal(LRC)can be converted to high value-added naphthalene and its alkylated derivatives through low-temperature catalytic pyrolysis.In this paper,the catalytic pyrolysis of Beisu LRC in a fixed-bed at low temperature was investigated.And the catalytic effects of HZSM-5,low-temperature carbocoal(LtC),and LtC-HZSM-5 on the content and yield of naphthalene oil were examined.The results showed that the generation of naphthalene oil in low-temperature LRC pyrolysis(LT-LP)process could be improved when LtC(prepared at 550℃)or HZSM-5 was individually used as a catalyst.Compared with sole pyrolysis of raw LRC,the addition of the LtC-HZSM-5 catalyst increased the content of naphthalene oil from 11.19 wt.%to 31.49 wt%.And the yield of naphthalene oil was increased from 1.07 wt%to 5.31 wt%.The reactions of micromolecular hydrogen-containing radicals(⋅MHCR)were optimized by LtC.⋅MHCR could be captured in relatively low-temperature region(200-400℃)and released at high temperature by LtC.The generation of phenolics was inhibited by HZSM-5.As a result,the naphthalene oil-rich tar was obtained through low-temperature LtC-HZSM-5 catalytic pyrolysis of Beisu LRC.

关键词： Naphthalene oil Low-temperature carbocoal HZSM-5 Low-rank coal Catalytic pyrolysis