As a new type of green solvent with non-volatility,high thermal stability,high conductivity and various adjustable properties,ionic liquid(IL)has been widely used in the capture and electrochemical reduction of carbon...As a new type of green solvent with non-volatility,high thermal stability,high conductivity and various adjustable properties,ionic liquid(IL)has been widely used in the capture and electrochemical reduction of carbon dioxide(CO_(2)).To date,many studies have been made to investigate CO_(2)capture by using different types of ILs and CO_(2)electrochemical reduction(CO_(2)ER)with ILs as either electrolyte or other catalytic active components.Some structure-activity relationships between the structure and adsorption or catalytic properties of ILs have been found.Herein,the absorption performances and mechanisms of conventional ILs,amino-functionalized ILs,non-amino functionalized ILs and supported ILs for CO_(2)capture,as well as the performances and action mechanisms of ILs as the electrolyte,electrolyte additive,and/or electrode modifier in the process of CO_(2)ER are summarized.Many researches indicate that the unique interaction between the anion or cation of IL and CO_(2)has a significant contribution to promote the absorption and conversion of CO_(2).However,the ILs used for CO_(2)capture and electrochemical reduction should be further explored.Especially,a more in-depth investigation of the adsorption and catalytic mechanisms with the help of quantum chemical calculation,molecular simulation,and in situ characterization techniques is necessary.It is expected to design and develop more efficient ILs used for CO_(2)capture and conversion on a large scale.展开更多
Mn-Co mixed oxides were electrodeposited on Cu nanowires generated on Cu foam(CF)and used for effectively catalytic oxidation of toluene.The physical and chemical properties of the prepared catalysts were characterize...Mn-Co mixed oxides were electrodeposited on Cu nanowires generated on Cu foam(CF)and used for effectively catalytic oxidation of toluene.The physical and chemical properties of the prepared catalysts were characterized by SEM,TEM,XRD,H_(2)-TPR,O_(2)-TPD and XPS.It is found that the Mn-Co mixed metal oxides were uniformly coated on the Cu nanowires by the electrochemical method,whose Mn/Co ratio can be tuned by adjusting the molar ratio of Mn/Co in the initial solution for the electrodeposition.The intimate contact between Mn and Co nanocrystals was found by HRTEM,which is important for realizing synergetic effects on improving catalytic activity.Meanwhile,the formation of the active surface oxygen species and the increase of the active species of Mn^(4+)and Co^(3+)were considered to make significant contribution to the catalytic oxidation of toluene.Mn-Co mixed metal oxide catalysts exhibited higher performance than the single metal oxide,and especially 0.10Mn-0.01Co/CF catalyst with the Mn/Co molar ratio of 10:1 in the initial solution for the electrodeposition achieved the highest catalytic activity with a low toluene conversion temperature(T_(90%))of 251℃,and displayed excellent catalytic stability even in the presence of water vapor.It is expected that such a simply-electrodeposited mixed metal oxides based catalysts could be applied for the oxidation of volatile organic compounds(VOCs)in a practical process.展开更多
A series of hetero-metal(Ni,Mn,and Cu)doped Co-based catalysts were prepared by a unipolar pulse electro-deposition(UPED)method and applied for the catalytic combustion of toluene.It is found that hetero-metal doping ...A series of hetero-metal(Ni,Mn,and Cu)doped Co-based catalysts were prepared by a unipolar pulse electro-deposition(UPED)method and applied for the catalytic combustion of toluene.It is found that hetero-metal doping significantly influenced the morphology and surface elemental compositions of Co-based catalysts,and the increase in the contents of Ni and Mn elements made a negative influence on the catalyst structure.H_(2)-TPR and O_(2)-TPD analysis results suggested that the hetero-metal doping enhanced the low temperature reducibility and resulted in the formation of lattice defects,which were favorable to generate more easily reducible species and facilitate the oxygen mobility,thereby improved the performance for the catalytic combustion of toluene.Especially,the Co-Cu/NF catalyst performed the best catalytic activity with the lowest toluene conversion temperature of T90 at 248℃,which should be contributed by its low-temperature reducibility,increased surface and lattice oxygen species,and high content of active Co^(3+)species promoted by the interaction of the mixed metal oxides.Moreover,the Co-Cu/NF also performed excellent catalytic stability and high selectivity to CO_(2) in the presence and absence of water vapor for the catalytic combustion of toluene for a long term.展开更多
基金supported by JSPS KAKENHI Grant 22H01855,Japan,Natural Science Foundation of Shanxi Province(No.202103021223044)China,and Shanxi Scholarship Council of China(2022-078),China.
文摘As a new type of green solvent with non-volatility,high thermal stability,high conductivity and various adjustable properties,ionic liquid(IL)has been widely used in the capture and electrochemical reduction of carbon dioxide(CO_(2)).To date,many studies have been made to investigate CO_(2)capture by using different types of ILs and CO_(2)electrochemical reduction(CO_(2)ER)with ILs as either electrolyte or other catalytic active components.Some structure-activity relationships between the structure and adsorption or catalytic properties of ILs have been found.Herein,the absorption performances and mechanisms of conventional ILs,amino-functionalized ILs,non-amino functionalized ILs and supported ILs for CO_(2)capture,as well as the performances and action mechanisms of ILs as the electrolyte,electrolyte additive,and/or electrode modifier in the process of CO_(2)ER are summarized.Many researches indicate that the unique interaction between the anion or cation of IL and CO_(2)has a significant contribution to promote the absorption and conversion of CO_(2).However,the ILs used for CO_(2)capture and electrochemical reduction should be further explored.Especially,a more in-depth investigation of the adsorption and catalytic mechanisms with the help of quantum chemical calculation,molecular simulation,and in situ characterization techniques is necessary.It is expected to design and develop more efficient ILs used for CO_(2)capture and conversion on a large scale.
文摘Mn-Co mixed oxides were electrodeposited on Cu nanowires generated on Cu foam(CF)and used for effectively catalytic oxidation of toluene.The physical and chemical properties of the prepared catalysts were characterized by SEM,TEM,XRD,H_(2)-TPR,O_(2)-TPD and XPS.It is found that the Mn-Co mixed metal oxides were uniformly coated on the Cu nanowires by the electrochemical method,whose Mn/Co ratio can be tuned by adjusting the molar ratio of Mn/Co in the initial solution for the electrodeposition.The intimate contact between Mn and Co nanocrystals was found by HRTEM,which is important for realizing synergetic effects on improving catalytic activity.Meanwhile,the formation of the active surface oxygen species and the increase of the active species of Mn^(4+)and Co^(3+)were considered to make significant contribution to the catalytic oxidation of toluene.Mn-Co mixed metal oxide catalysts exhibited higher performance than the single metal oxide,and especially 0.10Mn-0.01Co/CF catalyst with the Mn/Co molar ratio of 10:1 in the initial solution for the electrodeposition achieved the highest catalytic activity with a low toluene conversion temperature(T_(90%))of 251℃,and displayed excellent catalytic stability even in the presence of water vapor.It is expected that such a simply-electrodeposited mixed metal oxides based catalysts could be applied for the oxidation of volatile organic compounds(VOCs)in a practical process.
文摘A series of hetero-metal(Ni,Mn,and Cu)doped Co-based catalysts were prepared by a unipolar pulse electro-deposition(UPED)method and applied for the catalytic combustion of toluene.It is found that hetero-metal doping significantly influenced the morphology and surface elemental compositions of Co-based catalysts,and the increase in the contents of Ni and Mn elements made a negative influence on the catalyst structure.H_(2)-TPR and O_(2)-TPD analysis results suggested that the hetero-metal doping enhanced the low temperature reducibility and resulted in the formation of lattice defects,which were favorable to generate more easily reducible species and facilitate the oxygen mobility,thereby improved the performance for the catalytic combustion of toluene.Especially,the Co-Cu/NF catalyst performed the best catalytic activity with the lowest toluene conversion temperature of T90 at 248℃,which should be contributed by its low-temperature reducibility,increased surface and lattice oxygen species,and high content of active Co^(3+)species promoted by the interaction of the mixed metal oxides.Moreover,the Co-Cu/NF also performed excellent catalytic stability and high selectivity to CO_(2) in the presence and absence of water vapor for the catalytic combustion of toluene for a long term.
