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中国化学会·第一届全国二氧化碳资源化利用学术会议

作者： Masahiko Arai State Key Laboratory of Electroanalytical Chemistry Jilin Province Key Laboratory of Green Chemistry and Process Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Carbon dioxide is one of unsustainable substances that should be reduced or eliminated in the design, manufacture and use of chemical products. The utilization of CO in synthetic reactions contributes to the design of green sustainable chemical processes and has been investigated so far for several chemical reactions of practical importance. A few examples using CO as a chemical building block will be presented, such as the production of glycerol carbonate from glycerol and urea, in which glycerol is a byproduct in biomass conversion to fuels and urea is produced from CO, and the production of N, N-dimethylaniline via selective N-methylation of N-methylaniline by CO and H. The glycerol carbonate production via urea is one of indirect CO fixation reactions. Those reactions are multiphase reactions using conventional heterogeneous catalysts. In addition to the role of CO as a chemical building brock, it may act as a reaction promoter/controller in liquid phase reactions in spite of its inert nature. Some pressure is required for CO to dissolve into the liquid phases, in which the dissolved CO molecules may interact with reacting species(substrates, intermediates, catalysts), changing their reactivity, and the dissolution of CO assists the dissolution of coexisting gaseous reactants like H and O. The presence of dense phase CO may enhance the reaction rate and control the product selectivity of the liquid phase reactions. A few examples will be presented, including selective hydrogenation of carbonyl, nitro, and nitrile compounds with conventional supported metal catalysts and hydrogen production via photocatalytic water splitting with titanium dioxide powder. In hydrogenation of nitrobenzene, for instance, the desired product of aniline is obtained in 100% selectivity at any conversion level in the presence of CO.

关键词： carbon dioxide chemical building block carbonate synthesis N-methylation reaction promoter hydrogenation

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Controllable substitutional vanadium doping in wafer-scale molybdenum disulfide films

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Nano Research 2023年第2期16卷 3415-3421页

作者： Jihyung Seo Eunbin Son Jiha Kim Sun-Woo Kim Jeong Min Baik Hyesung Park Department of Materials Science and Engineering Graduate School of Semiconductor Materials and Devices EngineeringGraduate School of Carbon NeutralityLow Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea SKKU Institute of Energy Science and Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea

Substitutional atomic doping of transition metal dichalcogenides(TMDs)in the chemical vapor deposition(CVD)process is a promising and effective strategy for modifying their physicochemical ***,the conventional CVD method only allows narrow-range modulation of the dopant concentration owing to the low reactivity of the ***,the growth of wafer-scale monolayer TMD films with high dopant concentrations is much more ***,we report a facile doping approach based on liquid precursor-mediated CVD process for achieving high vanadium(V)doping in the MoS_(2)lattice with excellent doping uniformity and *** lateral growth of the host MoS_(2)lattice and the reactivity of the V precursor were simultaneously improved by introducing an alkali metal halide as a reaction *** metal halide promoter enabled the wafer-scale synthesis of V-incorporated MoS_(2)monolayer film with excessively high doping *** excellent wafer-scale uniformity of the highly V-doped MoS_(2)film was confirmed through a series of microscopic,spectroscopic,and electrical analyses.

关键词： doping concentration reaction promoter substitutional doping transition metal dichalcogenides wafer-scale growth

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