CuZn-based catalyst is an attractive catalyst for methanol synthesis from CO_(2)hydrogenation,but it early deactivates and its methanol yield still needs to improve.In this study,Y_(2)O_(3)was introduced to Cu/ZnO usi...CuZn-based catalyst is an attractive catalyst for methanol synthesis from CO_(2)hydrogenation,but it early deactivates and its methanol yield still needs to improve.In this study,Y_(2)O_(3)was introduced to Cu/ZnO using a one-pot hydrothermal method,and exhibits a synergistic effect of ZnO and Y_(2)O_(3)on enhancing methanol yield and the stability.We found that the interaction between Y_(2)O_(3)and ZnO results in abundant oxygen vacancies formation,thereby enhancing CO_(2)adsorption and activation.Kinetic analysis and in situ DRIFTS suggest that RWGS forming CO and methanol formation compete for a mutual intermediate HCOO^(*),and the introduction of Y_(2)O_(3)to Cu/ZnO raises the energy barrier for the CO formation but lowers that for methanol formation,thus enhancing the methanol yield on Cu/ZnO/Y_(2)O_(3).展开更多
In this paper,we have successfully prepared an organic-inorganic hybridized Keggin-type Ruthenium-containing polytungsten oxide clusters that combines the organic ligand 2,2'-bipyridine(2,2'-bpy)with the noble...In this paper,we have successfully prepared an organic-inorganic hybridized Keggin-type Ruthenium-containing polytungsten oxide clusters that combines the organic ligand 2,2'-bipyridine(2,2'-bpy)with the noble metal ruthenium,formulated as H_(3)[{Ru(H_(2)O)(bpy)}_(2)O(PW_(11)O_(39))]·10H_(2)O.Title compound inherited the strong absorption in the visible and UV regions,providing a good basis for photocatalysis.The experimental results showed that it exhibited good photocatalytic activity in the visible-lightdriven reduction of nitrobenzene using N_(2)H_(4)·H_(2)O as a reductant with a yield of 98.1%(turnover number is 322.5,turnover frequency is 53.75 h^(-1)).Three cycles of experiments indicated that this compound was an effective and stable heterogeneous catalyst.展开更多
文摘CuZn-based catalyst is an attractive catalyst for methanol synthesis from CO_(2)hydrogenation,but it early deactivates and its methanol yield still needs to improve.In this study,Y_(2)O_(3)was introduced to Cu/ZnO using a one-pot hydrothermal method,and exhibits a synergistic effect of ZnO and Y_(2)O_(3)on enhancing methanol yield and the stability.We found that the interaction between Y_(2)O_(3)and ZnO results in abundant oxygen vacancies formation,thereby enhancing CO_(2)adsorption and activation.Kinetic analysis and in situ DRIFTS suggest that RWGS forming CO and methanol formation compete for a mutual intermediate HCOO^(*),and the introduction of Y_(2)O_(3)to Cu/ZnO raises the energy barrier for the CO formation but lowers that for methanol formation,thus enhancing the methanol yield on Cu/ZnO/Y_(2)O_(3).
基金supported by the National Natural Science Foundation of China(22271075,22071044,22171071,21771054,and 21571050)
文摘In this paper,we have successfully prepared an organic-inorganic hybridized Keggin-type Ruthenium-containing polytungsten oxide clusters that combines the organic ligand 2,2'-bipyridine(2,2'-bpy)with the noble metal ruthenium,formulated as H_(3)[{Ru(H_(2)O)(bpy)}_(2)O(PW_(11)O_(39))]·10H_(2)O.Title compound inherited the strong absorption in the visible and UV regions,providing a good basis for photocatalysis.The experimental results showed that it exhibited good photocatalytic activity in the visible-lightdriven reduction of nitrobenzene using N_(2)H_(4)·H_(2)O as a reductant with a yield of 98.1%(turnover number is 322.5,turnover frequency is 53.75 h^(-1)).Three cycles of experiments indicated that this compound was an effective and stable heterogeneous catalyst.
