Selective hydrogenolysis of glycerol to 1,3‐propanediol（1,3‐PD） is an important yet challenging method for the transformation of biomass into value‐added chemicals due to steric hindrance and unfavorable thermody...Selective hydrogenolysis of glycerol to 1,3‐propanediol（1,3‐PD） is an important yet challenging method for the transformation of biomass into value‐added chemicals due to steric hindrance and unfavorable thermodynamics. In previous studies, chemoselective performances were found de‐manding and sensitive to H2 pressure. In this regard, we manipulate the chemical/physical charac‐teristics of the catalyst supports via doping Nb into WOx and prepared 1D needle‐, 2D flake‐, and 3D sphere‐stack mesoporous structured Nb‐WOx with increased surface acid sites. Moreover, Nb dop‐ing can successfully inhibit the over‐reduction of active W species during glycerol hydrogenolysis and substantially broaden the optimal H2 pressure from 1 to 5 MPa. When Nb doping is 2%, sup‐ported Pt catalysts showed promising performance for the selective hydrogenolysis of glycerol to 1,3‐PD over an unprecedentedly wide H2 pressure range, which will guarantee better catalyst sta‐bility in the long run, as well as expand their applications to other hydrogen‐related reactions.展开更多
Green and economical CO_(2)utilization is significant for CO_(2)emission reduction and energy development.Here,the 1D Mo_(2)C nanowires with dominant(101)crystal surfaces were modified by the deposition of atomic func...Green and economical CO_(2)utilization is significant for CO_(2)emission reduction and energy development.Here,the 1D Mo_(2)C nanowires with dominant(101)crystal surfaces were modified by the deposition of atomic functional components Rh and K.While unmodifiedβMo_(2)C could only convert CO_(2)to methanol,the designed catalyst of K_(0.2)Rh_(0.2)/β-Mo_(2)C exhibited up to 72.1%of ethanol selectivity at 150℃.It was observed that the atomically dispersed Rh could form the bifunctional active centres with the active carrierβMo_(2)C with the synergistic effects to achieve highly specific controlled C–C coupling.By promoting the CO_(2)adsorption and activation,the introduction of an alkali metal(K)mainly regulated the balanced performance of the two active centres,which in turn improved the hydrogenation selectivity.Overall,the controlled modification ofβMo_(2)C provides a new design strategy for the highly efficient,lowtemperature hydrogenation of CO_(2)to ethanol with single-atom catalysts,which provides an excellent example for the rational design of the complex catalysts.展开更多
Nanozymes,a category of nanomaterials endowed with enzyme-mimicking capabilities,have exhibited considerable potential across diverse application domains.This comprehensive review delves into the intricacies of regula...Nanozymes,a category of nanomaterials endowed with enzyme-mimicking capabilities,have exhibited considerable potential across diverse application domains.This comprehensive review delves into the intricacies of regulating nanozymes through N elements,elucidating the mechanisms governing N element control in the design and application of these nanomaterials.The initial sections introduce the foundational background and significance of nanozymes.Subsequent exploration delves into the detailed discussion of N element regulation mechanisms on nanozymes,encompassing N vacancies,N doping,N coordination,and nitride.These regulatory pathways play an instrumental role in fine-tuning the catalytic activity and specificity of nanozymes.The review further scrutinizes practical applications of N element regulation on nanozymes,spanning sensing detection,infection therapy,tumor therapy,and pollutant degradation.In conclusion,it succinctly summarizes the current research findings and proposes future directions for development.This thorough investigation into the regulation of nanozymes by N elements anticipates precise control over their performance,thereby advancing the extensive utilization of nanozymes in the realms of biomedical and environmental applications.展开更多
The major feature, interannual variability and variation cause of the Mindanao Eddy and its im- pact on the thermohaline structure are analyzed based on the Argo profiling float data, the history observed data and the...The major feature, interannual variability and variation cause of the Mindanao Eddy and its im- pact on the thermohaline structure are analyzed based on the Argo profiling float data, the history observed data and the SODA data. The analysis results show that the Mindanao Eddy is a per- manent cyclonic meso-scale eddy and spreads vertically from about 500 m depth upward do about 50 m depth. In addition to its strong seasonal variability, the Mindanao Eddy displays a remark- able interannual variability associated with ENSO. It strengthens and expands eastward during E1 Nifio while it weakens and retreats westward during La Nifia. The interannual variability in the Mindanao Eddy may be caused by the North Equatorial Counter Current, the North Equatorial Current, the Mindanao Current and the Indonesian Through Flow. The eddy variability can have a great influence on the thermohaline structure pattern in the local upper ocean. When the eddy is strong, the cold and low salinity water inside the eddy moves violently upward from deep layer, the thermoeline depth greatly shoals, and the subsurface high salinity water largely decreases ,with the upper mixed layer becoming thinner, and vice versa.展开更多
In this exploratory study, near-threshold scattering of D and ■ meson is investigated using lattice QCD with N f = 2 + 1 + 1 twisted mass fermion configurations. The calculation is performed in the coupled-channel L&...In this exploratory study, near-threshold scattering of D and ■ meson is investigated using lattice QCD with N f = 2 + 1 + 1 twisted mass fermion configurations. The calculation is performed in the coupled-channel Lüscher finite-size formalism. The study focuses on the channel with IG(JPC) = 1+(1+-) where the resonance-like structure Zc（3900） was discovered. We first identify the two most relevant channels and the lattice study is performed in the two-channel scattering model. Combined with the two-channel Ross-Shaw theory, scattering parameters are extracted from the energy levels by solving the generalized eigenvalue problem. Our results for the scattering length parameters suggest that for the particular lattice parameters that we studied, the best fit parameters do not correspond to the peak in the elastic scattering cross-section near the threshold. Furthermore, in the zero-range Ross-Shaw theory,the scenario of a narrow resonance close to the threshold is disfavored beyond the 3σ level.展开更多
基金supported by the National Natural Science Foundation of China (2169008, 21690084, 21673228, 21303187, 21403218)the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17020100)+1 种基金DICP ZZBS 201612Key Projects for Fundamental Research and Development of China (2016YFA0202801)~~
文摘Selective hydrogenolysis of glycerol to 1,3‐propanediol（1,3‐PD） is an important yet challenging method for the transformation of biomass into value‐added chemicals due to steric hindrance and unfavorable thermodynamics. In previous studies, chemoselective performances were found de‐manding and sensitive to H2 pressure. In this regard, we manipulate the chemical/physical charac‐teristics of the catalyst supports via doping Nb into WOx and prepared 1D needle‐, 2D flake‐, and 3D sphere‐stack mesoporous structured Nb‐WOx with increased surface acid sites. Moreover, Nb dop‐ing can successfully inhibit the over‐reduction of active W species during glycerol hydrogenolysis and substantially broaden the optimal H2 pressure from 1 to 5 MPa. When Nb doping is 2%, sup‐ported Pt catalysts showed promising performance for the selective hydrogenolysis of glycerol to 1,3‐PD over an unprecedentedly wide H2 pressure range, which will guarantee better catalyst sta‐bility in the long run, as well as expand their applications to other hydrogen‐related reactions.
基金financially supported by the National Natural Science Foundation of China(21925803,U19A2015)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB36030200)the Liao Ning Revitalization Talents Program(XLYC1907170).
文摘Green and economical CO_(2)utilization is significant for CO_(2)emission reduction and energy development.Here,the 1D Mo_(2)C nanowires with dominant(101)crystal surfaces were modified by the deposition of atomic functional components Rh and K.While unmodifiedβMo_(2)C could only convert CO_(2)to methanol,the designed catalyst of K_(0.2)Rh_(0.2)/β-Mo_(2)C exhibited up to 72.1%of ethanol selectivity at 150℃.It was observed that the atomically dispersed Rh could form the bifunctional active centres with the active carrierβMo_(2)C with the synergistic effects to achieve highly specific controlled C–C coupling.By promoting the CO_(2)adsorption and activation,the introduction of an alkali metal(K)mainly regulated the balanced performance of the two active centres,which in turn improved the hydrogenation selectivity.Overall,the controlled modification ofβMo_(2)C provides a new design strategy for the highly efficient,lowtemperature hydrogenation of CO_(2)to ethanol with single-atom catalysts,which provides an excellent example for the rational design of the complex catalysts.
基金supported by the Taishan Scholar Project of Shandong Province(tsqn202211168,tsqn202312247)the National Natural Science Foundation of China(52272212)+1 种基金the Natural Science Foundation of Shandong Province(ZR2022JQ20,ZR2021YQ04,ZR2023MB126)the Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science,MOE(M2022-7).
文摘Nanozymes,a category of nanomaterials endowed with enzyme-mimicking capabilities,have exhibited considerable potential across diverse application domains.This comprehensive review delves into the intricacies of regulating nanozymes through N elements,elucidating the mechanisms governing N element control in the design and application of these nanomaterials.The initial sections introduce the foundational background and significance of nanozymes.Subsequent exploration delves into the detailed discussion of N element regulation mechanisms on nanozymes,encompassing N vacancies,N doping,N coordination,and nitride.These regulatory pathways play an instrumental role in fine-tuning the catalytic activity and specificity of nanozymes.The review further scrutinizes practical applications of N element regulation on nanozymes,spanning sensing detection,infection therapy,tumor therapy,and pollutant degradation.In conclusion,it succinctly summarizes the current research findings and proposes future directions for development.This thorough investigation into the regulation of nanozymes by N elements anticipates precise control over their performance,thereby advancing the extensive utilization of nanozymes in the realms of biomedical and environmental applications.
基金The National Basic Research Program of China "973" project under contract No. 2007CB816002the innovative key project of Chinese Academy of Sciences under contract Nos KZCXZ-YW-201 and KZCX2-YW-Q11-02the Fund of Key Laboratory of Global Change and Marine-Atmospheric Chemistry,SOA under contract No.GCMAC2010.
文摘The major feature, interannual variability and variation cause of the Mindanao Eddy and its im- pact on the thermohaline structure are analyzed based on the Argo profiling float data, the history observed data and the SODA data. The analysis results show that the Mindanao Eddy is a per- manent cyclonic meso-scale eddy and spreads vertically from about 500 m depth upward do about 50 m depth. In addition to its strong seasonal variability, the Mindanao Eddy displays a remark- able interannual variability associated with ENSO. It strengthens and expands eastward during E1 Nifio while it weakens and retreats westward during La Nifia. The interannual variability in the Mindanao Eddy may be caused by the North Equatorial Counter Current, the North Equatorial Current, the Mindanao Current and the Indonesian Through Flow. The eddy variability can have a great influence on the thermohaline structure pattern in the local upper ocean. When the eddy is strong, the cold and low salinity water inside the eddy moves violently upward from deep layer, the thermoeline depth greatly shoals, and the subsurface high salinity water largely decreases ,with the upper mixed layer becoming thinner, and vice versa.
基金Supported in part by the Ministry of Science and Technology of China(MSTC)under 973 project"Systematic studies on light hadron spectroscopy"(2015CB856702)supported in part by the DFG and the NSFC through funds provided to the Sino-Germen CRC 110"Symmetries and the Emergence of Structure in QCD",DFG grant no.TRR 110 and NSFC(11621131001)+2 种基金supported in part by the National Science Foundation of China(NSFC)(11775229,11875169)the Youth Innovation Promotion Association of CAS(2015013)the support from the Key Research Program of the Chinese Academy of Sciences(XDPB09)
文摘In this exploratory study, near-threshold scattering of D and ■ meson is investigated using lattice QCD with N f = 2 + 1 + 1 twisted mass fermion configurations. The calculation is performed in the coupled-channel Lüscher finite-size formalism. The study focuses on the channel with IG(JPC) = 1+(1+-) where the resonance-like structure Zc（3900） was discovered. We first identify the two most relevant channels and the lattice study is performed in the two-channel scattering model. Combined with the two-channel Ross-Shaw theory, scattering parameters are extracted from the energy levels by solving the generalized eigenvalue problem. Our results for the scattering length parameters suggest that for the particular lattice parameters that we studied, the best fit parameters do not correspond to the peak in the elastic scattering cross-section near the threshold. Furthermore, in the zero-range Ross-Shaw theory,the scenario of a narrow resonance close to the threshold is disfavored beyond the 3σ level.
