Non-noble bimetals have attracted extensive attention for their natural aboundance and low cost,but it remains a big challenge to design and synthesize novel supported non-noble bimetal nanocatalyst in a controllable ...Non-noble bimetals have attracted extensive attention for their natural aboundance and low cost,but it remains a big challenge to design and synthesize novel supported non-noble bimetal nanocatalyst in a controllable and high-efficient manner.Herein,a novel hollow spherical supported non-noble bimetal nanocatalyst with porous carbon shell as the continuous matrix and Cu/Co bimetal nanoparticles as the dispersion phase is successfully fabricated by a convenient strategy involving spray drying and subsequent heat treatment.The morphology and microstructure depend catalyst activity of the hollow spherical supported catalyst has been studied systematically.It is found that the heating temperature plays a critical role in determining the microstructure and catalytic performance of the products.With an optimal heating temperature of 600°C,the corresponding product exhibits the highest normalized reaction rate constant(k_(n))of 25.4 s^(-1)g^(-1)for catalytic reduction of 4-notrophenol,which can be attributed to the suitable synergism of the well-defined bimetal structure,combined effect of the two metallic phases and the metal-support interaction.This work provides an additional strategy for the simultaneous formation of both the support and the active loading phase of supported non-noble bimetal nanocatalyst,and may shed some light on the high-efficiency synthesis of other supported heterostructure with various compositions and properties.展开更多
Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were exa...Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were examined after separate treatment in CO＋O2 or CO2 ＋O2 .Furthermore,in situ FT-IR studies were performed to investigate the species on the surface when CO or CO＋O2 or CO2 ＋O2 was selected separately as adsorption gas.The results showed that Au/Al2O3 catalyst exhibited very high initial activity,but the catalytic activity was found to decrease gradually during CO oxidation with time on stream.And also,the activity of the catalyst declined after treatment in CO＋O2 or CO2 ＋O2 .The formation and accumulation of carbonate-like species during CO oxidation or treatment in CO＋O2 or CO2 ＋O2 might be mainly responsible for the activity decrease,which was reversible.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51872298)the National Key R&D Program of China(No.2016YFC0304505 and 2019YFC0311401)the Strategic Priority Research Program of Chinese Academy of Science(No.XDA22010202)。
文摘Non-noble bimetals have attracted extensive attention for their natural aboundance and low cost,but it remains a big challenge to design and synthesize novel supported non-noble bimetal nanocatalyst in a controllable and high-efficient manner.Herein,a novel hollow spherical supported non-noble bimetal nanocatalyst with porous carbon shell as the continuous matrix and Cu/Co bimetal nanoparticles as the dispersion phase is successfully fabricated by a convenient strategy involving spray drying and subsequent heat treatment.The morphology and microstructure depend catalyst activity of the hollow spherical supported catalyst has been studied systematically.It is found that the heating temperature plays a critical role in determining the microstructure and catalytic performance of the products.With an optimal heating temperature of 600°C,the corresponding product exhibits the highest normalized reaction rate constant(k_(n))of 25.4 s^(-1)g^(-1)for catalytic reduction of 4-notrophenol,which can be attributed to the suitable synergism of the well-defined bimetal structure,combined effect of the two metallic phases and the metal-support interaction.This work provides an additional strategy for the simultaneous formation of both the support and the active loading phase of supported non-noble bimetal nanocatalyst,and may shed some light on the high-efficiency synthesis of other supported heterostructure with various compositions and properties.
基金supported by the Science and Research Reward Fund Program of Shandong Excellent Young Scientist of China (2007BS04033)
文摘Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were examined after separate treatment in CO＋O2 or CO2 ＋O2 .Furthermore,in situ FT-IR studies were performed to investigate the species on the surface when CO or CO＋O2 or CO2 ＋O2 was selected separately as adsorption gas.The results showed that Au/Al2O3 catalyst exhibited very high initial activity,but the catalytic activity was found to decrease gradually during CO oxidation with time on stream.And also,the activity of the catalyst declined after treatment in CO＋O2 or CO2 ＋O2 .The formation and accumulation of carbonate-like species during CO oxidation or treatment in CO＋O2 or CO2 ＋O2 might be mainly responsible for the activity decrease,which was reversible.
基金supported by the Ph.D.Program Foundation of Ministry of Education of China(20131103110002)the NNSF of China(21377008)+2 种基金National High Technology Research and Development Program(863 Program,2015AA034603)Foundation on the Creative Research Team Con-struction Promotion Project of Beijing Municipal InstitutionsScientific Research Base Construction-Science and Technology Creation Plat-form-National Materials Research Base Construction~~
