Plasma-coupled catalysis is a promising volatile organic co mpounds(VOCs) removal technology because of its interactional principles of plasma decomposition and catalytic oxidation.However,the problem of harmful by-pr...Plasma-coupled catalysis is a promising volatile organic co mpounds(VOCs) removal technology because of its interactional principles of plasma decomposition and catalytic oxidation.However,the problem of harmful by-products is still in trouble.A series of rare earth doped RE-NiO_(x)(RE=Ce,Y,La) composite oxides were synthesized by metal organic frameworks(MOFs)-derived method for coupled plasma oxidation of benzene and by-product ozone removal.Compared with plasma alone,the 1%La-NiO_(x)catalyst shows the best enhancement of 50% for benzene conversion with complete removal of a maximum of 800 ppm ozone.The energy consumption for 90% benzene removal efficiency(η90%) is also reduced from 3600 to 1200 J/L.Characterization re sults of RE-NiO_(x) catalysts indicate that the doping of La causes interaction and synergistic effect between La and Ni,and the surface oxygen and lattice oxygen with defects play crucial roles in benzene oxidation and ozone decomposition,respectively.In addition,the decomposition mechanism of benzene and ozone under plasma is proposed.Plasma is responsible for the indiscriminate bond breaking in benzene and oxygen to form a variety of organic intermediates and ozone,while the La-NiO_(x) catalyst selectively oxidizes the intermediates to CO_(x)/H2O and decomposes the ozone into oxygen.展开更多
Surface reconstructed SrTiO_(3)nanocrystals were synthesized by a thermal treatment process in presence of NaBH_(4)and SrTiO_(3)nanocrystals.The surface reconstruction of SrTiO_(3)nanocrystals is attributed to the int...Surface reconstructed SrTiO_(3)nanocrystals were synthesized by a thermal treatment process in presence of NaBH_(4)and SrTiO_(3)nanocrystals.The surface reconstruction of SrTiO_(3)nanocrystals is attributed to the introduction of surface oxygen vacancies or Ti sites(such as Ti^(3+)and Ti^(2+))during the hydrogenation treatment process.The light absorption and the charge transfer ability of SrTiO_(3)nanocrystals are simultaneously enhanced due to surface oxygen vacancies or Ti sites(such as Ti^(3+)and Ti^(2+)),which are beneficial to photocatalytic water splitting.Meanwhile,these defects also change the redox potential of the photocatalysts.Since there existed a synergistic effect between the three,the ratio of hydrogen to oxygen production was also regulated.展开更多
基金the National Natural Science Foundation of China (21773153)the National Key Basic Research and Development Program (2018YFB1502001) for the financial supportthe Funding support from Centre of Hydrogen Science, Shanghai Jiao Tong University, China~~
基金Project supported by the National Natural Science Foundation of China(22176123,U1832155)the National Key Research&Development Plan(2017YFC0211804).
文摘Plasma-coupled catalysis is a promising volatile organic co mpounds(VOCs) removal technology because of its interactional principles of plasma decomposition and catalytic oxidation.However,the problem of harmful by-products is still in trouble.A series of rare earth doped RE-NiO_(x)(RE=Ce,Y,La) composite oxides were synthesized by metal organic frameworks(MOFs)-derived method for coupled plasma oxidation of benzene and by-product ozone removal.Compared with plasma alone,the 1%La-NiO_(x)catalyst shows the best enhancement of 50% for benzene conversion with complete removal of a maximum of 800 ppm ozone.The energy consumption for 90% benzene removal efficiency(η90%) is also reduced from 3600 to 1200 J/L.Characterization re sults of RE-NiO_(x) catalysts indicate that the doping of La causes interaction and synergistic effect between La and Ni,and the surface oxygen and lattice oxygen with defects play crucial roles in benzene oxidation and ozone decomposition,respectively.In addition,the decomposition mechanism of benzene and ozone under plasma is proposed.Plasma is responsible for the indiscriminate bond breaking in benzene and oxygen to form a variety of organic intermediates and ozone,while the La-NiO_(x) catalyst selectively oxidizes the intermediates to CO_(x)/H2O and decomposes the ozone into oxygen.
基金This work was supported by the National Natural Science Foundation of China(Grant No.21773153)the National Key Research and Development Program of China(No.2018YFB1502001).
文摘Surface reconstructed SrTiO_(3)nanocrystals were synthesized by a thermal treatment process in presence of NaBH_(4)and SrTiO_(3)nanocrystals.The surface reconstruction of SrTiO_(3)nanocrystals is attributed to the introduction of surface oxygen vacancies or Ti sites(such as Ti^(3+)and Ti^(2+))during the hydrogenation treatment process.The light absorption and the charge transfer ability of SrTiO_(3)nanocrystals are simultaneously enhanced due to surface oxygen vacancies or Ti sites(such as Ti^(3+)and Ti^(2+)),which are beneficial to photocatalytic water splitting.Meanwhile,these defects also change the redox potential of the photocatalysts.Since there existed a synergistic effect between the three,the ratio of hydrogen to oxygen production was also regulated.
