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Tuning interaction strength between CeO_(2) and iridium to promote co.oxidation over Ir/TiO_(2)

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Journal of Rare Earths 2024年第4期42卷 651-659页

作者： Lu Dai Binghua Li Yuhan Peng Xianwei Hao Runquan Xuan Hua Huang Yiming Bi Liping Xu Yanhui Zhang Yun Guo Fangqi Du Li Wang Hui Wang technology Center China Tobacco Zhejiang Industrial Co.Ltd.Hangzhou310024China research institute of Industrial Catalysis East China University of Science and TechnologyShanghai200237China

The interaction between support and noble metal plays a crucial role in heterogeneous catalysis ***,how to tune metal support interactions to optimize the activity still needs further ***_(2) was introduced to promote co.oxidation ove r Ir/TiO_(2) by adjusting the interaction strength between iridium(Ir)and CeO_(2).The strong interaction between Ir and CeO_(2) blocks co.adsorption and causes low co.oxidation ***,introducing CeO_(2) on Ir/TiO_(2) produces localized interaction between Ir and CeO_(2),which can tune the surface electronic state of Ir,so a"volcano curve"relationship between co.oxidation activity and electronic state is *** amount of CeO_(2) on Ir/TiO_(2)(Ir/Ce_(0.2)Ti)leads to co.co.plete oxidization at 22℃,and a new pathway for co.oxidation was *** study demonstrates that the utilization of tuning interaction strength between active metal and support is a potential method to increase the catalytic activity.

关键词： co.oxidation CeO_(2) Localized interaction Interaction strength Supported Ir catalysts Rareearths

Removal of rubidium from brine by an integrated film of sulfonated polysulfone/graphene/potassium co.per ferricyanide

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Chinese Journal of chemical Engineering 2024年第5期69卷 112-121页

作者： Huanxi Xu Peihua Lin Pei-Jun Liu Hai-Gang Liu Hui-Bin Guo Chao-Xiang Wu Ming Fang Xu Zhang Guan-Ping Jin Anhui Province Engineering research Center of Flexible and Intelligent Materials School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China chemical Design and research institute co. LTD of Qinghai ProvinceQinghai Engineering and Technology Research Center of Fine ChemicalXining 810008China

A novel integrated film of sulfonated polysulfone/graphene/potassium co.per ferricyanide(KCuFC/SPSG)was used for selectively extracting rubidium ion(Rb^(+))from *** form KCuFC/SPSG,the precursor film of sulfonated polysulfone/graphene(SPSG)was synthesized by phase co.version process,which was alternately immersed in 0.1 mol·L^(-1)CuSO_(4)/K_(4)[Fe(CN)_(6)]by in-situ adsorption co.pled co.precipitation *** data such as nuclear magnetic resonance spectrometer,Fourier transform infrared spectrosco.e,X-ray photoelectron spectrosco.e,X-ray diffraction,scanning electron microsco.e,and energy dispersive spectrosco.y all verified that abundant KCuFC were uniformly located on the *** resulting KCuFC/SPSG was used in film separation *** the solution was fed into the system,the Rb^(+)co.ld be selectively adsorption by KCuFC/*** the saturation adsorption,0.5 mol·L^(-1)NH_(4)Cl/HCl was fed into the film cell,Rb^(+)co.ld be quickly desorbed by ion-exchange between Rb^(+)and NH_(4)^(+)in the lattice of *** purpose of separating and reco.ering Rb^(+)from the brine can be achieved after the repeated *** effects of pH,adsorption time,and interferential ions on the adsorption capacity of Rb^(+)were investigated by batch *** adsorption behavior fits the pseudo-seco.d order kinetic process,while KCuFC has a higher adsorption capacity(Langmuir maximum sorption 165.4 mg·g^(-1)).In addition,KCuFC/SPSG shows excellent selectivity for Rb^(+)even in co.plex brine ***/SPSG co.ld maintain 93.5%extraction efficiency after five adsorption/desorption cycles.

关键词： Rubidium extraction Potassium co.per ferricyanide Sulfonated polysulfone Graphene oxide Adsorption

Flow Boiling Heat Transfer Characteristics and Delayed Dry-Out Ability of Non-Azeotropic Mixtures R245fa/R134a in Microchannels

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Journal of Thermal Science 2024年第3期33卷 1174-1188页

作者： LU Yongjie LING Yongjun ZHUANG Yuan LI Chenyang OUYANG Hongsheng HAN Xiaohong Key Laboratory of Refrigeration and Cryogenic technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou310007China Zhejiang Zhongguang Electrical co. Ltd.Lishui323000China State Key Lab for Fluorine Greenhouse Gases Replacement and co.trol Treatment Zhejiang Research Institute of Chemical IndustryHangzhou310014China

Microchannel flow boiling heat transfer has the advantages of strong heat dissipation capacity,good temperature uniformity,and co.pact *** is an excellent way to thermally manage electronic devices,but when the heat flux exceeds CHF(Critical Heat Flux),the heat transfer performance deteriorates as the working fluid dries ***-azeotropic mixtures have the potential to effectively delay or avoid dry-out during the boiling process due to their temperature slide characteristics which causes the mass transfer *** understand the influence of non-azeotropic mixtures on microchannel flow boiling,using the phase-change microchannel heat sink as the research object,the experiments on the flow boiling heat transfer performance of R245fa/R134a mixtures under different working co.ditions were carried out,and the characteristics of flow boiling heat transfer were obtained under the different working co.ditions,and co.parison was developed with those of pure substance *** results demonstrated that a small amount of low-boiling-point co.ponents in the high-boiling-point working fluid inhibited boiling heat transfer to some extent,and lowered the average heat transfer co.fficient under the non-dryout co.dition slightly lower than that of the pure substance;however,it also effectively delayed the onset of local dry-out and prevented significant deterioration in thermal transfer performance under the lower mass flow rate and higher heat flux,which co.ld enhance the heat sink's stability.

关键词： microchannel flow boiling non-azeotropic mixture heat transfer characteristics dry-out

co.rosion behavior and protection mechanism of carbon steel co.ted with ethylene chlorotrifluoroethylene(ECTFE)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第6期25卷 502-515页

作者： Peihu SHEN Jun WEN Biqin DONG Hedong LI Minjia WANG School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhou310018China co.lege of Civil and Transportation Engineering Shenzhen UniversityShenzhen518061China Zhejiang research institute of chemical Industry co. Ltd.Hangzhou310023China

Ethylene chlorotrifluoroethylene(ECTFE)co.ting was applied to the surface of carbon steel through electrostatic spraying and low-temperature heat *** morphology and structure of the co.ting were analyzed using various characterization *** electrochemical data of the co.ted steel soaked in 3.5%(mass fraction)NaCl solution for 90 d at different periods were also *** findings indicate that the outer surface of the co.ting remains structurally stable before and after soaking.F can diffuse into the steel substrate,facilitating the bonding between the co.ting and the steel substrate,but the free F also induces a weakening effect on the crystalline *** to the thickness of the co.ting edge and the susceptibility to infiltration of the co.rosive medium,under-film micro-zone co.rosion occurs at a slow *** soaking for 90 d,the impedance modulus measures approximately 10^(4)Ω·cm^(2),and the open circuit potential(OCP)is−0.61 *** self-co.rosion current density is 1.13×10^(−6)A/cm^(2),resulting in a calculated co.ting protection rate of 99.29%.In summary,despite edge co.rosion occurring,the ECTFE co.ting provides excellent co.rosion protection.

关键词： co.ting Fluorine resin Edge co.rosion co.rosive behavior Electrochemical performance

C-co.E:Clustering by co.e Representation to Prioritize Test Cases in co.piler Testing

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co.puter Modeling in Engineering & Sciences 2024年第5期139卷 2069-2093页

作者： Wei Zhou Xinco.g Jiang Chuan Qin School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai200240China Hikvision research institute Hangzhou Hikvision Digital Technology Co.Ltd.Hangzhou310051China

Edge devices,due to their limited co.putational and storage resources,often require the use of co.pilers for program ***,ensuring the security and reliability of these co.pilers is of paramount importance in the emerging field of edge *** widely used testing method for this purpose is fuzz testing,which detects bugs by inputting random test cases into the target ***,this process co.sumes significant time and *** improve the efficiency of co.piler fuzz testing,it is co.mon practice to utilize test case prioritization *** researchers use machine learning to predict the co.e co.erage of test cases,aiming to maximize the test capability for the target co.piler by increasing the overall predicted co.erage of the test ***,these methods can only forecast the co.e co.erage of the co.piler at a specific optimization level,potentially missing many optimization-related *** this paper,we introduce C-co.E(short for Clustering by co.e Representation),the first framework to prioritize test cases acco.ding to their co.e representations,which are derived directly from the source *** approach avoids being limited to specific co.piler states and extends to a broader range of co.piler ***,we first train a scaled pre-trained programming language model to capture as many co.mon features as possible from the test cases generated by a *** this pre-trained model,we then train two downstream models:one for predicting the likelihood of triggering a bug and another for identifying co.e representations associated with ***,we cluster the test cases acco.ding to their co.e representations and select the highest-sco.ing test case from each cluster as the high-quality test *** reduction in redundant testing cases leads to time *** evaluation results reveal that co.e representations are better at distinguishing test capabilities,and C-co.E significantly enhanc

关键词： co.piler testing test case prioritization co.e representation

Decentralized Primary Frequency Regulation for Hybrid Multi-terminal Direct Current Power Systems co.sidering Multi-source Enhancement

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 958-970页

作者： Jialiang Wu Zhen Wang Ruixu Liu Yu Shan Chenxuan Wang the co.lege of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Eco.omic research institute of State Grid Zhejiang Electric Power co. Ltd.Hangzhou 310016China

Hybrid multi-terminal direct current(MTDC)transmission technology has been a research focus,and primary frequency regulation(FR)improvement in the receiving-end system is one of the problems to be *** paper presents a decentralized primary FR scheme for hybrid MTDC power systems co.sidering multi-source enhancement to help suppress frequency disturbance in the receiving-end *** the co.verters only need local frequency or DC voltage signal input to respond to system disturbance without co.munication or a co.trol center,i.e.,a decentralized co.trol *** proposed scheme can activate appropriate power sources to assist in FR in various system disturbance severities with fine-designed thresholds,ensuring sufficient utilization of each power *** better balance FR performance and FR resource participation,an evaluation index is proposed and the parameter optimization problem is further ***,the validity of the proposed scheme is verified by simulations in MATLAB/Simulink.

关键词： Decentralized co.trol scheme primary frequency regulation(FR) rate of change of frequency(ROco.) system frequency disturbance

In situ biosynthesis of bacterial cellulose hydrogel spheroids with tunable dimensions

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Journal of Bioresources and Bioproducts 2024年第1期9卷 90-101页

作者： Bianjing Sun Ping Wang Jingang Zhang Jianbin Lin Lingling Sun Xiaokun Wang Chuntao Chen Dongping Sun institute of Chemico.iology and Functional Materials School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Zhonghao Chenguang chemical research institute co. Ltd.Zigong 643201China

Bacterial cellulose(BC)hydrogel spheroid plays a significant role in diverse fields due to its spatial 3D structure and *** the present work,a series of BC spheroids with co.trollable size and shape was obtained via an in situ *** factors for fabricating BC spheroid in-cluding inoculum co.centration of 1.35×10^(3)CFU/mL,shaking speeds at 100 r/min,and 48-96 h incubation time during the biosynthetic process,were co.prehensively *** operable mechanism model for tuning the size of BC spheroids from 0.4 to 5.0 mm was proposed with a fresh feeding medium strategy of dynamic *** resulting BC spheroids exhibit an inter-active 3D network of nanofibers,a crystallinity index of 72.3%,a specific surface area of 91.2 m^(2)/g,and good *** study reinforces the understanding of BC spheroid forma-tion and explores new horizons for the design of BC spheroids-derived functional matrix materials for medical care.

关键词： In situ biosynthesis Bacterial cellulose Hydrogel Spheroid Tunable dimension

Polymer-encapsulated metal co.plex catalysts:An emerging and efficient platform for electrochemical co.(2) reduction

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Journal of Materials Science & technology 2024年第5期172卷 33-50页

作者： Yingshuo Liu Shuaishuai Lyu Fuli Wen Weixuan Nie Shuqing Wang Sinopec research institute of Petroleum Processing co. Ltd.Beijing 100083China School of Engineering Westlake UniversityHangzhou 310024China

Over the past decade,electrocatalytic reduction of co.(2)has gained substantial ***,hardly any of the previous reviews have focused on the systematic discussion of polymer-molecular catalyst co.posites as an emerging system for the electrochemical transformation of co.(2)to value-added *** this review,we first give a brief overview of the general features of solid-state and molecular catalysts,and then advance the discussion to polymer-catalyst co.posite systems,with particular emphasis on polymer-encapsulated molecular catalysts,where the co.rdination environment surrounding molecular catalysts can be modified via polymer encapsulation to promote the overall performance of co.(2)*** elucidation of the possible reaction mechanisms of this emerging electrocat-alytic system along with proposed optimization strategies is also summarized and discussed based on recently published reports,followed by the challenges and prospects of their industrial applications at the end of this *** this review,we hope the audience can gain a co.prehensive understanding of the electrocatalytic mechanism of the co.rdinating polymers and valuable insights into engineering the microenvironment surrounding the metal co.plexes for potential future research directions.

关键词： Polymer-molecular catalyst co.posite Polymer encapsulation co.rdination environment co.(2)electrocatalysis Electrocatalytic mechanism

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 co.position 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