Carbon nanotube is found to be a novel support for the selective hydrogenation of citral in this paper. Selective hydrogenation of citral was carried out in an autoclave at 5 MPa and 323 K. The results indicate that t...Carbon nanotube is found to be a novel support for the selective hydrogenation of citral in this paper. Selective hydrogenation of citral was carried out in an autoclave at 5 MPa and 323 K. The results indicate that the selectivity of the products, unsaturated alcohols, is about 86 over Pt/CNTs catalyst and 48 over Pt/XC-72 catalyst, respectively. The differential heat of CO adsorption measured by microcalorimetry is firstly used to probe surface adsorption sites of platinum catalyst supported on carbon nanotubes. The experimental results indicate that the Pt/CNTs catalyst shows a higher initial differential heat of CO adsorption(126 kJ/mol) than the Pt/XC-72 catalyst(106 kJ/mol).展开更多
Differential heats of H 2 adsorption on γNo 2N catalysts were studied by using microcalorimetry.Samples with high and medium surface areas (90 and 17 m2·g -1 ) present a homogeneous energetic distribution of sur...Differential heats of H 2 adsorption on γNo 2N catalysts were studied by using microcalorimetry.Samples with high and medium surface areas (90 and 17 m2·g -1 ) present a homogeneous energetic distribution of surface sites,which corresponds with the preferential orientation of their (200) planes.Molybdenum nitride with low surface area (8 m2·g -1 ) displays a heterogeneous energetic distribution of H 2 adsorption sites.The higher initial differential heat of hydrogen adsorption observed for the low surface Mo nitride was attributed to species adsorbed on surface sites associated with the (111) plane.展开更多
文摘Carbon nanotube is found to be a novel support for the selective hydrogenation of citral in this paper. Selective hydrogenation of citral was carried out in an autoclave at 5 MPa and 323 K. The results indicate that the selectivity of the products, unsaturated alcohols, is about 86 over Pt/CNTs catalyst and 48 over Pt/XC-72 catalyst, respectively. The differential heat of CO adsorption measured by microcalorimetry is firstly used to probe surface adsorption sites of platinum catalyst supported on carbon nanotubes. The experimental results indicate that the Pt/CNTs catalyst shows a higher initial differential heat of CO adsorption(126 kJ/mol) than the Pt/XC-72 catalyst(106 kJ/mol).
文摘Differential heats of H 2 adsorption on γNo 2N catalysts were studied by using microcalorimetry.Samples with high and medium surface areas (90 and 17 m2·g -1 ) present a homogeneous energetic distribution of surface sites,which corresponds with the preferential orientation of their (200) planes.Molybdenum nitride with low surface area (8 m2·g -1 ) displays a heterogeneous energetic distribution of H 2 adsorption sites.The higher initial differential heat of hydrogen adsorption observed for the low surface Mo nitride was attributed to species adsorbed on surface sites associated with the (111) plane.
