Chemical vapor deposition (DLI-CVD) and characterization of multiphasic molybdate-based catalysts for propene oxidation

Deposition by DLI-CVD of a multi-element BiFeCoMo catalyst in the millimetric channels of a monolithic reactor has been achieved. When tested for the oxidation of propene to acrolein the reactors with various coatings are efficient but need to be optimized.

Exploiting the dynamic properties of Pt on ceria for low-temperature CO oxidation

Low-temperature redispersion leads to an intermediate Pt monolayer arrangement, very active for CO oxidation.

Selective oxidation of propene to acrolein on FeMoTeO catalysts: determination of active phase and enhancement of catalytic activity and stability

Multicomponent FeMoTeO catalysts have been synthesized and studied for mild propene oxidation to acrolein.

Bimetallic PdAg nanoparticle arrays from monolayer films of diblock copolymer micelles

The self-assembly technique provides a highly efficient route to generate well-ordered structures on a nanometer scale. In this paper, well-ordered arrays of PdAg alloy nanoparticles on flat substrates with narrow distributions of particle size (6-7 nm) and interparticle spacing (about 60 nm) were synthesized by the block copolymer micelle approach. A home-made PS-b-P4VP diblock copolymer was prepared to obtain a micellar structure in toluene. Pd and Ag salts were then successfully loaded in the micellar core of the PS-b-P4VP copolymer. A self-assembled monolayer of the loaded micelles was obtained by dipping the flat substrate in the solution. At this stage, the core of the micelles was still loaded with the metal precursor rather than with a metal. Physical and chemical reducing methods were used to reduce the metal salts embedded in the P4VP core into PdAg nanoparticles. HRTEM and EDX indicated that Pd-rich PdAg alloy nanoparticles were synthesized by chemical or physical reduction; UV-visible spectroscopy observations confirmed that metallic PdAg nanoparticles were quickly formed after chemical reduction; XPS measurements revealed that the PdAg alloy nanoparticles were in a metallic state after a short time of exposure to O2 plasma and after hydrazine reduction.