This study explores the adsorption and reac-tion of methanol on the CeO_(2)(111)and Ni/CeO_(2)(111)surfaces,highlighting the es-sential role of metal-support interaction in methanol decomposition by a synergistic ap-p...This study explores the adsorption and reac-tion of methanol on the CeO_(2)(111)and Ni/CeO_(2)(111)surfaces,highlighting the es-sential role of metal-support interaction in methanol decomposition by a synergistic ap-proach encompassing synchrotron radiation photoemission spectroscopy,X-ray photo-electron spectroscopy,infrared reflection and absorption spectroscopy,and temperature-programmed desorption.Our findings reveal that Ni deposited on the CeO_(2)(111)surface,followed by annealing to 700 K,leads to the formation of Ce-O-Ni mixed oxide as the dominant phase.The Ni^(2+)species facilitate the methoxy decomposition into CO and H_(2)within 300-430 K,with a small amount of formalde-hyde also forming at the edge sites of ceria.Additionally,some methoxy adsorbed on the bare CeO_(2)surface migrates to the Ce-O-Ni mixed oxide,where they decompose into CO and H_(2)at 500-600 K,accompanied by a portion of the methoxy interacting with ceria to generate formaldehyde.Upon exposure to methanol at 500 K,the Ni^(2+)species are reduced to metallic Ni^(0),alongside the formation of coke and Ni_(3)C,ultimately resulting in catalyst deactivation.However,reintroducing O_(2)reactivates these sites by oxidizing metallic Ni^(0)and Ni_(3)C species.This study highlights the pivotal role of metal-support interaction in promoting oxygen trans-fer from ceria to Ni,thereby enhancing methoxy decomposition and significantly improving the performance of Ni-based catalysts for methanol decomposition into CO and H_(2).展开更多
The seismic safety of offshore wind turbines is an important issue that needs to be solved urgently.Based on a unified computing framework,this paper develops a set of seawater-seabed-wind turbine zoning coupling anal...The seismic safety of offshore wind turbines is an important issue that needs to be solved urgently.Based on a unified computing framework,this paper develops a set of seawater-seabed-wind turbine zoning coupling analysis methods.A 5 MW wind turbine and a site analysis model are established,and a seismic wave is selected to analyze the changes in the seismic response of offshore monopile wind turbines under the change of seawater depth,seabed wave velocity and seismic wave incidence angle.The analysis results show that when the seawater increases to a certain depth,the seismic response of the wind turbine increases.The shear wave velocity of the seabed affects the bending moment and displacement at the bottom of the tower.When the angle of incidence increases,the vertical displacement and the acceleration of the top of the tower increase in varying degrees.展开更多
基金financially supported by the National Key R&D Program of China(2023YFA1509103)the National Natural Science Foundation of China(Nos.22272157,21872131,22106085,and U1932214)。
文摘This study explores the adsorption and reac-tion of methanol on the CeO_(2)(111)and Ni/CeO_(2)(111)surfaces,highlighting the es-sential role of metal-support interaction in methanol decomposition by a synergistic ap-proach encompassing synchrotron radiation photoemission spectroscopy,X-ray photo-electron spectroscopy,infrared reflection and absorption spectroscopy,and temperature-programmed desorption.Our findings reveal that Ni deposited on the CeO_(2)(111)surface,followed by annealing to 700 K,leads to the formation of Ce-O-Ni mixed oxide as the dominant phase.The Ni^(2+)species facilitate the methoxy decomposition into CO and H_(2)within 300-430 K,with a small amount of formalde-hyde also forming at the edge sites of ceria.Additionally,some methoxy adsorbed on the bare CeO_(2)surface migrates to the Ce-O-Ni mixed oxide,where they decompose into CO and H_(2)at 500-600 K,accompanied by a portion of the methoxy interacting with ceria to generate formaldehyde.Upon exposure to methanol at 500 K,the Ni^(2+)species are reduced to metallic Ni^(0),alongside the formation of coke and Ni_(3)C,ultimately resulting in catalyst deactivation.However,reintroducing O_(2)reactivates these sites by oxidizing metallic Ni^(0)and Ni_(3)C species.This study highlights the pivotal role of metal-support interaction in promoting oxygen trans-fer from ceria to Ni,thereby enhancing methoxy decomposition and significantly improving the performance of Ni-based catalysts for methanol decomposition into CO and H_(2).
基金supported in part by the National Natural Science Foundation of China(Nos.51978337,U2039209).
文摘The seismic safety of offshore wind turbines is an important issue that needs to be solved urgently.Based on a unified computing framework,this paper develops a set of seawater-seabed-wind turbine zoning coupling analysis methods.A 5 MW wind turbine and a site analysis model are established,and a seismic wave is selected to analyze the changes in the seismic response of offshore monopile wind turbines under the change of seawater depth,seabed wave velocity and seismic wave incidence angle.The analysis results show that when the seawater increases to a certain depth,the seismic response of the wind turbine increases.The shear wave velocity of the seabed affects the bending moment and displacement at the bottom of the tower.When the angle of incidence increases,the vertical displacement and the acceleration of the top of the tower increase in varying degrees.
