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An investigation of the CH_(3)OH and CO selectivity of CO_(2)hydrogenation over Cu-Ce-Zr catalysts

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 950-962页

作者： Weiwei Wang Xiaoyu Zhang Min Guo jianan li Chong Peng School of life Science and Chemistry MinNan Science and Technology UniversityQuanzhou 362332China Sinochem Quanzhou Petrochemical Co. Ltd.Quanzhou 362100China School of Resources and Environmental Engineering East China University of Science and TechnologyShanghai 200237China Department of Instrument Science and Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

A series of Cu-Ce-Zr catalysts with different Ce contents are applied to the hydrogenation of CO_(2)to CO/CH3OH *** Cu-Ce-Zr catalyst with 2 wt%Ce loading shows higher CO selectivity(S_(CO)=0.0%-87.8%)from 200-300℃,while the Cu-Ce-Zr catalyst with 8 wt%Ce loading presents higher CO_(2)conversion(X_(CO_(2))=5.4%-15.6%)and CH3OH selectivity(S_(CH_(3)OH)=97.8%-40.6%).The number of hydroxyl groups and solid solution nature play a significant role in changing the reaction *** solid solution enhances the CO_(2)adsorption *** the CO_(2)adsorption step,a larger number of hydroxyl groups over the Cu-Ce-Zr catalyst with 8 wt%Ce loading leads to the production of H-containing adsorption *** the CO_(2)hydrogenation step,a larger number of hydroxyl groups assists in encouraging the further hydrogenation of intermediate species to CH_(3)OH and improving the hydrogenation ***,the Cu-Ce-Zr catalyst with 8 wt%Ce loading favors CH3OH selectivity and CO_(2)activation,while CO is preferred on the Cu-Ce-Zr catalyst with 2 wt%Ce loading,a smaller number of hydroxyl groups and a solid solution ***,high-pressure in situ diffuse reflectance infrared Fourier transform spectroscopy shows that CO is produced from formate decomposition and that both monodentate formate and bidentate formate are active intermediate species of CO_(2)hydrogenation to CH3OH.

关键词： CO_(2)hydrogenation Cu-Ce-Zr hydroxyls CO/CH3OH selectivity

Simulatingthe Effect of Temperature Gradient on Grain Growth of 6061-T6 Aluminum Alloy via Monte Carlo Potts Algorithm

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Computer Modeling in Engineering & Sciences 2021年第10期129卷 99-116页

作者： Qi Wu jianan li lianchun Long linao liu Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China

During heat treatment or mechanical processing,most polycrystalline materials experience grain growth,which significantly affects their mechanical *** simulation on a mesoscopic scale is an important way of studying grain growth.A key research focus of this type of method has long been how to efficiently and accurately simulate the grain growth caused by a non-uniform temperature field with temperature *** this work,we propose an improved 3D Monte Carlo Potts(MCP)method to quantitatively study the relationship between non-uniform temperature fields and final grain *** of the aluminum alloy AA6061-T6 are used to establish a trial calculation model and to verify the algorithms with existing experimental results in *** detailed grain growth process of the 6061-T6 aluminum alloy under different temperature fields is then obtained,and grain morphologies at various positions are *** indicate that while absolute temperature and duration time are the primary factors determining the final grain size,the temperature gradient also has strong influence on the grain *** relationships between temperatures,temperature gradients and grain growth process have been *** proposed MCP algorithm can be applied to different types of materials when the proper parameters are used.

关键词： Grain growth temperature gradient polycrystalline materials Monte Carlo method aluminum alloy

A"turn-on"fluorescent sensor for Pb^(2+)detection based on nitrogen doping carbon dots

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Chinese Journal of Structural Chemistry 2023年第4期42卷 13-17页

作者： jianan li Wenbo Sun Xinyong li Chong Peng National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai200237China School of Resources and Environmental Engineering Shandong University of TechnologyZibo255000China State Key Laboratory of Fine Chemicals and Key Laboratory of Industrial Ecology and Environmental Engineering Dalian University of TechnologyDalian116024China School of Sensing Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China Zhejiang Tiandi Environmental Protection Engineering Co. LtdHangzhou310003China

*** Due to the severe toxicity of heavy metal ions,human health and eco-system are threatened even at ultra-low concentrations[1].Specially,Pb^(2+)arouses more significant concern as its bio-accumulation seriously affects brain development,reproductive systems,and cardiovascular function,consequently resulting in an irreversible *** to World Health Organization(WHO),the maximum allowable Pb^(2+)con-centration on the surface water should belicate pretreatment.

关键词： cardiovascular irreversible doping

Study of a low-disturbance pressure-preserving corer and its coring performance in deep coal mining conditions

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International Journal of Mining Science and Technology 2023年第11期33卷 1397-1410页

作者： Wei Huang jianan li Zhiqiang liu Mingqing Yang Zhenxi You Heping Xie School of Mechanical Engineering Sichuan UniversityChengdu 610065China College of Water Resource and Hydropower Sichuan UniversityChengdu 610065China Jin Shi Drill Tech Co. LtdTangshan 063004China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China

With the increasing depth of coal mining,the requirements for coring devices that maintain pressure are *** adapt to the special environment in deep coal seams and improve the accuracy of testing gas content,a low-disturbance pressure-preserving corer was *** measurement of gas content using this corer was *** coring test platform was used to complete a coring function test.A pressurized core with a diameter of 50 mm was *** pressure was 0.15 MPa,which was equal to the pressure of the liquid column of the cored layer,indicating that the corer can be successfully used in a mud ***,a pressure test of the corer was *** results showed that under conditions of low pressure(8 MPa)and high pressure(25 MPa),the internal pressure of the corer remained stable for more than 1 h,indicating that the corer has good ability to maintain ***,the corer can be applied at deep coal mine *** results of this research can be used to promote the safe exploitation of deep coal mines and the exploitation of methane resources in coalbeds.

关键词： Pressure-preserving corer Low-disturbance Coring performance Deep coal mining conditions

Facile molybdenum and aluminum recovery from spent hydrogenation catalyst

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Chinese Journal of Chemical Engineering 2024年第5期69卷 72-78页

作者： Zhenhui Lv jianan li Dong Xue Tao Yang Gang Wang Chong Peng State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian 116041China

Industrial catalyst waste has emerged as a hazardous pollutant that requires safe and proper disposal after the unloading *** a valuable and sustainable strategy for its treatment is a significant challenge compared to traditional *** this study,we present a facile method for the recovery of molybdenum and aluminum contents from spent Mo-Ni/Al_(2)O_(3) hydrogenation catalysts through crystallization separation and ***,the recovered molybdenum and aluminum are utilized as active metals and carriers for the preparation of new *** properties were thoroughly analyzed and investigated using various characterization *** hydrogenation activity of these newly prepared catalysts was evaluated on a fixed-bed small-scale device and compared with a reference catalyst synthesized from commercial raw ***,the hydrogenation activity of the catalysts was further assessed by using the entire distillate oil of coal liquefaction as the raw oil,specifically focusing on denitrogenation and aromatic *** work not only offers an effective solution for recycling catalysts but also promotes sustainable development.

关键词： Waste treatment Alumina Hydrogenation Catalyst Crystallization Precipitation

Current controversies in glia-to-neuron conversion therapy in neurodegenerative diseases

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Neural Regeneration Research 2024年第4期19卷 723-724页

作者： Peng Cao jianan li Zhuxi liu Guobiao liang Department of Neurosurgery General Hospital of the Northern Theater Command of Chinese People's Liberation Army Key Laboratory of Precision Medical Research on Major Chronic Disease Shengjing Hospital of China Medical University

Loss of neurons and disruption of neural circuits are associated with many neurological diseases,including neurodegenerative diseases and mental *** most prevalent pathological feature of neurodegenerative diseases is the aggregate loss of certain neuronal *** example,the loss of dopamine(DA)neurons in the substantia nigra pars compacta has been defined as a pathological hallmark of Parkinson’s disease(PD;Kamath et al.,2022).

关键词： diseases degenerative al.

High-temperature Thermal Properties and Wear Behavior of Basalt as Heat Storage Material for Concentrated Solar Power Plants

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Journal of Wuhan University of Technology(Materials Science) 2022年第4期37卷 547-553页

作者： liAO Jun ZHU Xupeng li jianan XUE Shuwen ZOU Changwei ZHANG Jun School of Physics Scienceand Technology Lingnan Normal UniversityZhanjang 524048China

The microstructures,components,thermal stability,specific heat capacity and thermal conductivity of basalt sample were ***,as a comprehensive result of thermal expansion and contraction process,both the friction coefficient and wear rate of the basalt sample were also *** results indicate that basalt is an excellent candidate to be used as thermal energy storage material for concentrated solar power plants,and also provide a strategy for solar energy utilization in volcanic area with excellent geographical environment.

关键词： thermal energy storage concentrated solar power basalt wear rate

Mechanical Properties and Network Structure of Hydrophobic Association Hydrogels Prepared from Octylphenol Polyoxyethylene（7） Acrylate and Sodium Dodecyl Sulfate

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Chemical Research in Chinese Universities 2015年第4期31卷 633-639页

作者： liANG Zi GAO Tingting XU jianan li Zhiying liU Xiaoli liU Fengqi College of Chemistry Jilin University Changchun 130012 P. R. China

Hydrophobic association hydrogels（HA-gels） with high mechanical strength were prepared by free radical micellar copolymerization in aqueous solutions of acrylamide（AM）, anion surfactant sodium dodecyl sulfate（SDS） and a small amount of hydrophobic monomer octylphenol polyoxyethylene（7） acrylate（OP-7-AC）. We found that the molar ratio of SDS to OP-7-AC has a great effect on the tensile strength and other mechanical property parameters. The best ratio point R＇ was determined. On the basis of Mooney theory and statistical theory, the critical tensile ratios and critical tensile strengths of the hydrogels were obtained, elastic parameters C1 and C2 were calculated via uniaxial tensile equation and structural parameters, such as the effective network chain density and the averaged molecular weight of the chain between cross-linking points of all the hydrogels were evaluated. The results indicate that the variation of mechanical property parameters depends on the number of effective cross-linking points and the match degree of long and short chains.

关键词： Hydrophobic association Cross-linking point Distribution of chain Surfactant

Pencil-beam scanning catheter for intracoronary optical coherence tomography

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Opto-Electronic Advances 2022年第3期5卷 69-75页

作者： Jiqiang Kang Rui Zhu Yunxu Sun jianan li Kenneth K.Y.Wong School of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China International Graduate School at Shenzhen Tsinghua UniversityShenzhen 518055China Shenzhen Vivolight Medical Device&Technology Co. Ltd.Shenzhen 518055China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongChina Advanced Biomedical Instrumentation Centre Hong Kong Science ParkShatinNew TerritoriesHong KongChina

Current gradient-index(GRIN)lens based proximal-driven intracoronary optical coherence tomography(ICOCT)probes consist of a spacer and a GRIN lens with large gradient *** design provides great flexibility to control beam profiles,but the spacer length should be well controlled to obtain desired beam profiles and thus it sets an obstacle in mass catheter ***,although GRIN lens with large gradient constant can provide tight focus spot,it has short depth of focus and fast-expanded beam which leads to poor lateral resolution for deep *** this paper,a type of spacer-removed probe is demonstrated with a small gradient constant GRIN *** design simplifies the fabrica-tion process and is suitable for mass *** output beam of the catheter is a narrow nearly collimated light beam,referred to as pencil beam *** full width at half maximum beam size varies from 35.1μm to 75.3μm in air over 3-mm *** design principles are elaborated with probe/catheter fabrication and performance *** in vivo imaging of the catheter was verified by a clinical ICOCT *** results prove that this novel pencil-beam scanning catheter is potentially a good choice for ICOCT systems.

关键词： optical coherence tomography endoscopic imaging intravascular imaging fiber optics imaging