Catalytically-grown carbon nanofibers of two different conformations, fishbone and parallel types of the arrangement of carbon layers, were employed as the support of Pd-Pt metal catalysts for the hydrogenation of nap...Catalytically-grown carbon nanofibers of two different conformations, fishbone and parallel types of the arrangement of carbon layers, were employed as the support of Pd-Pt metal catalysts for the hydrogenation of naphthalene to tetralin. The sulfur tolerance of the catalyst system was investigated with the addition of 0.05% thiophene to the reactant of naphthalene in the process. The dispersion of Pd-Pt metal particles on the support was observed with a HREM and a pulsed hydrogen chemisorption method. The hydrogenation reaction of naphthalene was carried out in a CSTR at 250℃ and with the hydrogen pressure of 6 MPa. The results showed that the Pd-Pt catalyst supported on the carbon nanofibers was active in the process. The Pd-Pt metal catalyst supported on the parallel carbon nanofibers showed a higher sulfur tolerance than that on the fishbone carbon nanofibers. The reason may be attributed to their different conformations of the carbon layers, which leads to the different interaction of carbon layers with the supported metal particles.展开更多
Thanks to the synergistic effect,the bimetallic catalysts show better catalytic activity than the single metal cat-alysts and become a focus of research in heterogeneous catalysis.In this study,we successfully prepare...Thanks to the synergistic effect,the bimetallic catalysts show better catalytic activity than the single metal cat-alysts and become a focus of research in heterogeneous catalysis.In this study,we successfully prepared Pd-Pt icosahedra which show high peroxidase-like activity under the synergistic effects of Pd and Pt.V max of the Pd-Pt icosahedra was significantly enhanced by 1.66 times for 3,3’,5,5’-tetramethylbenzidine(TMB)as the substrate and 1.23 times for H_(2)O_(2) as the substrate,compared to that of the Pd icosahedra alone.By harnessing the supe-rior peroxidase-like activity of Pd-Pt icosahedra,we successfully utilized Pd-Pt icosahedral nanozymes in various biological analyses based on colorimetry.In most cases,using a Pd-Pt icosahedra/H_(2)O_(2)/TMB system,glucose,glutathione(GSH),acid phosphatase(ACP),and alkaline phosphatase(ALP)were detected over a wide range of 0.05∼0.20 mM,0∼20 mM,0∼10 U/L and 0∼12 U/L.In this study,we prepared a novel bimetallic nanozyme that exhibited excellent peroxidase-like activity owing to the bimetallic synergistic effect,thus demonstrating the promising potential of Pd-Pt icosahedra in the field of bioanalysis.展开更多
文摘Catalytically-grown carbon nanofibers of two different conformations, fishbone and parallel types of the arrangement of carbon layers, were employed as the support of Pd-Pt metal catalysts for the hydrogenation of naphthalene to tetralin. The sulfur tolerance of the catalyst system was investigated with the addition of 0.05% thiophene to the reactant of naphthalene in the process. The dispersion of Pd-Pt metal particles on the support was observed with a HREM and a pulsed hydrogen chemisorption method. The hydrogenation reaction of naphthalene was carried out in a CSTR at 250℃ and with the hydrogen pressure of 6 MPa. The results showed that the Pd-Pt catalyst supported on the carbon nanofibers was active in the process. The Pd-Pt metal catalyst supported on the parallel carbon nanofibers showed a higher sulfur tolerance than that on the fishbone carbon nanofibers. The reason may be attributed to their different conformations of the carbon layers, which leads to the different interaction of carbon layers with the supported metal particles.
基金This work was supported by the National Natural Science Foun-dation of China(22172063)the Young Taishan Scholar Pro-gram(tsqn201812080)+1 种基金the Natural Science Foundation of Shandong Province(ZR2019YQ10)the Independent Cultivation Program of Innovation Team of Jinan City(2021GXRC052).
文摘Thanks to the synergistic effect,the bimetallic catalysts show better catalytic activity than the single metal cat-alysts and become a focus of research in heterogeneous catalysis.In this study,we successfully prepared Pd-Pt icosahedra which show high peroxidase-like activity under the synergistic effects of Pd and Pt.V max of the Pd-Pt icosahedra was significantly enhanced by 1.66 times for 3,3’,5,5’-tetramethylbenzidine(TMB)as the substrate and 1.23 times for H_(2)O_(2) as the substrate,compared to that of the Pd icosahedra alone.By harnessing the supe-rior peroxidase-like activity of Pd-Pt icosahedra,we successfully utilized Pd-Pt icosahedral nanozymes in various biological analyses based on colorimetry.In most cases,using a Pd-Pt icosahedra/H_(2)O_(2)/TMB system,glucose,glutathione(GSH),acid phosphatase(ACP),and alkaline phosphatase(ALP)were detected over a wide range of 0.05∼0.20 mM,0∼20 mM,0∼10 U/L and 0∼12 U/L.In this study,we prepared a novel bimetallic nanozyme that exhibited excellent peroxidase-like activity owing to the bimetallic synergistic effect,thus demonstrating the promising potential of Pd-Pt icosahedra in the field of bioanalysis.
