SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the a...SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the environment.Based on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were studied.Studies have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of degradation.Under the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),respectively.The synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)O.When the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),respectively.At the same time,different external gases exhibit different capabilities to regulate decomposition products.The addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.展开更多
In the semiconductor industry,recovering and capturing SF_(6)gas from the SF_(6)/N_(2)gas mixture has significant environmental and economic benefits.In this work,two Ni-based metal-organic frameworks(MOFs),Ni(i-na)(b...In the semiconductor industry,recovering and capturing SF_(6)gas from the SF_(6)/N_(2)gas mixture has significant environmental and economic benefits.In this work,two Ni-based metal-organic frameworks(MOFs),Ni(i-na)(bdc)_(0.5)(ina=isonicotinic acid,bdc=terephthalic acid)and methyl-functionalized Ni(3-min)(bdc)_(0.5)(3-min=3-methylisonicotinic acid),are constructed for SF_(6)capture.Ni(ina)(bdc)_(0.5)and Ni(3-min)(bdc)_(0.5)are both highly stable nine-connected porous materials.The pore sizes of these two materials are similar,but the pore environments are different,which has a bearing on the performance of SF_(6)/N_(2)separations.Ni(3-min)(bdc)0.s exhibits higher SF_(6)adsorption capacity(50.5 cm^(3)g^(-1))and IAST(ideal adsorbed solution theory)SF_(6)/N_(2)selectivity(91)owing to its smaller window diameter and suitable pore chemistry.Theoretical calculations indicate that the SF_(6)and N_(2)molecules interact with the framework at different cages,which reduces their competition for adsorption sites.The remarkable separation performance of Ni(ina)(bdc)_(0.5)and Ni(3-min)(bdc)_(0.5)is further verified by dynamic breakthrough experiments.Thus,these two adsorbents have the potential to be utilized in industrial applications due to their excellent structural stability and recyclability.展开更多
基金supported by Guizhou Province (Ceneral), grant/award number Qian Ke He Zhi Cheng [2022] General 207, National Natural Science Foundation of China (No. 52307170)Natural Science Foundation of Hubei Province, China (No. 2023AFB382)。
文摘SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the environment.Based on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were studied.Studies have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of degradation.Under the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),respectively.The synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)O.When the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),respectively.At the same time,different external gases exhibit different capabilities to regulate decomposition products.The addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.
基金financially supported by the National Natural Science Foundation of China(No,21901198)the Thousand Talents Programs of Shaanxi Province and Shccig-Qinling Program.
文摘In the semiconductor industry,recovering and capturing SF_(6)gas from the SF_(6)/N_(2)gas mixture has significant environmental and economic benefits.In this work,two Ni-based metal-organic frameworks(MOFs),Ni(i-na)(bdc)_(0.5)(ina=isonicotinic acid,bdc=terephthalic acid)and methyl-functionalized Ni(3-min)(bdc)_(0.5)(3-min=3-methylisonicotinic acid),are constructed for SF_(6)capture.Ni(ina)(bdc)_(0.5)and Ni(3-min)(bdc)_(0.5)are both highly stable nine-connected porous materials.The pore sizes of these two materials are similar,but the pore environments are different,which has a bearing on the performance of SF_(6)/N_(2)separations.Ni(3-min)(bdc)0.s exhibits higher SF_(6)adsorption capacity(50.5 cm^(3)g^(-1))and IAST(ideal adsorbed solution theory)SF_(6)/N_(2)selectivity(91)owing to its smaller window diameter and suitable pore chemistry.Theoretical calculations indicate that the SF_(6)and N_(2)molecules interact with the framework at different cages,which reduces their competition for adsorption sites.The remarkable separation performance of Ni(ina)(bdc)_(0.5)and Ni(3-min)(bdc)_(0.5)is further verified by dynamic breakthrough experiments.Thus,these two adsorbents have the potential to be utilized in industrial applications due to their excellent structural stability and recyclability.
