In this paper,we report the fabrication of cobalt-doped de-NO_(x)catalyst by pyrolyzing an analogous metal-organic framework-74(MOF-74)containing Fe&Mn.The resulted catalyst exhibits distinctive microstructures of...In this paper,we report the fabrication of cobalt-doped de-NO_(x)catalyst by pyrolyzing an analogous metal-organic framework-74(MOF-74)containing Fe&Mn.The resulted catalyst exhibits distinctive microstructures of manganese,cobalt,and iron immobilized on N-doped carbon nanotubes(CNTs).It is found through experiments that the trimetallic catalyst Fe_(2)Mn_(1)Co_(0.5)/CNTs-50 has the best NH_(3)-selective catalytic reduction(SCR)performance.The Fe_(2)Mn_(1)Co_(0.5)/CNTs-50 exhibited excellent water and sulfur resistance and good stability under the harsh gas environment of 250℃ and/or 170℃,NO=NH_(3)=1,000 ppm,8 vol.%O_(2),20 vol.%H2O,1,000 ppm SO_(2),and gas hourly space velocity(GHSV)=75,000 h^(-1).The de-NO_(x)conversion was maintained about 55%and 25%after 192 h.The water and sulfur resistance performance were much higher than commercial vanadium series catalyst.The highly water and sulfur resistance performance may be attributed to the unique core-shell microstructure and the synergistic effect of manganese,cobalt,and iron which helps reduce the formation for byproducts(NH_(4)HSO_(4)).This study may promote to explore the development of a high stability catalyst for low-temperature selective catalytic reduction of NO_(x)with NH_(3).展开更多
A three-dimensional copper metal-organic framework with the rare chabazite(CHA)topology namely FJI-Y11 has been constructed with flexibly carboxylic ligand 5,5'-[(1,4-phenylenebis(methylene))bis(oxy)]diisophthalic...A three-dimensional copper metal-organic framework with the rare chabazite(CHA)topology namely FJI-Y11 has been constructed with flexibly carboxylic ligand 5,5'-[(1,4-phenylenebis(methylene))bis(oxy)]diisophthalic acid(H_(4)L).FJI-Y11 exhibits high water stability with the pH range from 2 to 12 at temperature as high as 373 K.Importantly,FJI-Y11 also shows high efficiency of hydrogen isotope separation using dynamic column breakthrough experiments under atmospheric pressure at 77 K.Attributed to its excellent structural stability,FJI-Y11 possesses good regenerated performance and maintains high separation efficiency after three cycles of breakthrough experiments.展开更多
基金The authors acknowledge financial support from the National Natural Science Foundation of China(No.21573286)the Key scientific and technological innovation projects in Shandong Province(No.2019JZZY010343).
文摘In this paper,we report the fabrication of cobalt-doped de-NO_(x)catalyst by pyrolyzing an analogous metal-organic framework-74(MOF-74)containing Fe&Mn.The resulted catalyst exhibits distinctive microstructures of manganese,cobalt,and iron immobilized on N-doped carbon nanotubes(CNTs).It is found through experiments that the trimetallic catalyst Fe_(2)Mn_(1)Co_(0.5)/CNTs-50 has the best NH_(3)-selective catalytic reduction(SCR)performance.The Fe_(2)Mn_(1)Co_(0.5)/CNTs-50 exhibited excellent water and sulfur resistance and good stability under the harsh gas environment of 250℃ and/or 170℃,NO=NH_(3)=1,000 ppm,8 vol.%O_(2),20 vol.%H2O,1,000 ppm SO_(2),and gas hourly space velocity(GHSV)=75,000 h^(-1).The de-NO_(x)conversion was maintained about 55%and 25%after 192 h.The water and sulfur resistance performance were much higher than commercial vanadium series catalyst.The highly water and sulfur resistance performance may be attributed to the unique core-shell microstructure and the synergistic effect of manganese,cobalt,and iron which helps reduce the formation for byproducts(NH_(4)HSO_(4)).This study may promote to explore the development of a high stability catalyst for low-temperature selective catalytic reduction of NO_(x)with NH_(3).
基金the Strategic Priority Research Program of CAS(No.XDB20000000),the Key Research Program of Frontier Sciences,CAS(No.QYZDB-SSW-SLH019)the Natural Nature Science Foundation of China(Nos.21771177,51603206,21203117).
文摘A three-dimensional copper metal-organic framework with the rare chabazite(CHA)topology namely FJI-Y11 has been constructed with flexibly carboxylic ligand 5,5'-[(1,4-phenylenebis(methylene))bis(oxy)]diisophthalic acid(H_(4)L).FJI-Y11 exhibits high water stability with the pH range from 2 to 12 at temperature as high as 373 K.Importantly,FJI-Y11 also shows high efficiency of hydrogen isotope separation using dynamic column breakthrough experiments under atmospheric pressure at 77 K.Attributed to its excellent structural stability,FJI-Y11 possesses good regenerated performance and maintains high separation efficiency after three cycles of breakthrough experiments.
