Single-atom catalysts have been applied in many processes recently.The difference of their kinetic behavior compared to the traditional heterogeneous catalysts has not been extensively discussed yet.Herein a complete ...Single-atom catalysts have been applied in many processes recently.The difference of their kinetic behavior compared to the traditional heterogeneous catalysts has not been extensively discussed yet.Herein a complete catalytic cycle of CH4 combustion assuming to be confined at isolated single sites of the Co3O4(110)surface is computationally compared with that on multi sites.The macroscopic kinetic behaviors of CH4 combustion on Co3O4(110)is systematically and quantitatively compared between those on the single site and multi sites utilizing kinetic Monte Carlo simulations upon the energetic information from the PBE+U calculation and statistic mechanics.The key factors governing the kinetics of CH4 combustion are disclosed for both the catalytic cycles respectively following the single-site and multi-site mechanisms.It is found that cooperation of multi active sites can promote the activity of complete CH4 combustions substantially in comparison to separated single-site catalyst whereas the confinement of active sites could regulate the selectivity of CH4 oxidation.The quantitative understanding of catalytic mechanism paves the way to improve the activity and selectivity for CH4 oxidation.展开更多
聚合酶链反应(PCR)是80年代中期发展起来的一项体外扩增 DNA 技术,由于它具有灵敏度高、特异性强等优点,其应用已给整个核酸研究领域带来了一场革命.结合 PCR 技术所进行的限制性片段长度多态性(RFLP)分析法已成为检测 DNA 分子上碱基...聚合酶链反应(PCR)是80年代中期发展起来的一项体外扩增 DNA 技术,由于它具有灵敏度高、特异性强等优点,其应用已给整个核酸研究领域带来了一场革命.结合 PCR 技术所进行的限制性片段长度多态性(RFLP)分析法已成为检测 DNA 分子上碱基变化的常用方法。但是,能检测点突变的方法仍主要依赖于 RNase 错配切割分析。展开更多
文摘Single-atom catalysts have been applied in many processes recently.The difference of their kinetic behavior compared to the traditional heterogeneous catalysts has not been extensively discussed yet.Herein a complete catalytic cycle of CH4 combustion assuming to be confined at isolated single sites of the Co3O4(110)surface is computationally compared with that on multi sites.The macroscopic kinetic behaviors of CH4 combustion on Co3O4(110)is systematically and quantitatively compared between those on the single site and multi sites utilizing kinetic Monte Carlo simulations upon the energetic information from the PBE+U calculation and statistic mechanics.The key factors governing the kinetics of CH4 combustion are disclosed for both the catalytic cycles respectively following the single-site and multi-site mechanisms.It is found that cooperation of multi active sites can promote the activity of complete CH4 combustions substantially in comparison to separated single-site catalyst whereas the confinement of active sites could regulate the selectivity of CH4 oxidation.The quantitative understanding of catalytic mechanism paves the way to improve the activity and selectivity for CH4 oxidation.
文摘聚合酶链反应(PCR)是80年代中期发展起来的一项体外扩增 DNA 技术,由于它具有灵敏度高、特异性强等优点,其应用已给整个核酸研究领域带来了一场革命.结合 PCR 技术所进行的限制性片段长度多态性(RFLP)分析法已成为检测 DNA 分子上碱基变化的常用方法。但是,能检测点突变的方法仍主要依赖于 RNase 错配切割分析。
