Search

The structure and catalytic properties of Pd catalyst supported on the outer surface or inner surface of carbon nanotubes (CNTs) have been investigated by using various experimental techniques combined with acetylene selective hydrogenation tests. It has been shown that Pd/CNTs-out catalyst exhibits higher ethylene selectivity than Pd/CNTs-in catalyst for acetylene selective hydrogenation. The electron interaction between CNTs support and palladium particles is responsible for higher ethylene selectivity over Pd/CNTs-out catalyst. Graphical Abstract: It is found that Pd/CNTs-out catalyst exhibits higher ethylene selectivity than Pd/CNTs-in catalyst for acetylene selective hydrogenation. The electron interaction between CNTs support and palladium particles is responsible for higher ethylene selectivity over Pd/CNTs-out catalyst.[Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Molybdenum oxynitride was prepared by hydrazine reduction of MoO3 at moderate temperatures. The anhydrous condition was favorable to production of amorphous molybdenum oxynitride, and the presence of hydrogen favored the reduction of Mo6+ and Mo4+ species to Mo δ+ (0 < δ < 4) species. These molybdenum oxynitrides exhibited activity for hydrogenation which depended on the amount of Mo δ+ (0 < δ < 4) species produced under reaction conditions. The amorphous molybdenum oxynitride MoO1.83N0.36 catalyst showed a good catalytic activity, selectivity, and resistance to poisoning of H2S for liquid-phase hydrogenation of longer-chain alkadienes. [ABSTRACT FROM AUTHOR]

The state and reactivity of lattice oxygen ions in the ultrafine Ce–Mo oxide particles prepared by the sol–gel method are studied by using X ray diffraction, laser Raman spectroscopy, temperature programmed reduction, X ray photoelectron spectroscopy and pulse microreactor tests. It is found that the lattice oxygen ions in the ultrafine Ce–Mo oxides are the main active species for partial oxidation of toluene to benzaldehyde. By decreasing the size of complex Ce–Mo oxide particles to nanometric scale, the reactivity of lattice oxygen ions can be remarkably improved. [ABSTRACT FROM AUTHOR]