Preparation, characterization, and catalytic properties for the SCR of NO by NH3 of V2O5/TiO2 catalysts prepared by equilibrium deposition filtration

Article Abstract:

V2O5/TiO2 catalysts prepared through the equilibrium deposition filtration (EDF) process are compared with catalysts made with the classical wet impregnation technique. The role of the EDF preparation parameters on the physicochemical and catalytic properties of V2O5/TiO2 catalysts have also been examined. The catalysts were analyzed using various spectroscopic methods and were tested for the SCR of NO by NH3 between 250 to 450 degrees C. Results show EDF supported the vanadia phase and the support surface and stopped the formation of the V2O5 crystallites. Decreasing the impregnation pH in the EDF preparations increased the V content.

Nitric oxide, Vanadium

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Purification and characterization of single-wall carbon nanotubes

Article Abstract:

A purification method is developed that provides for the removal of metal catalysts and impurity carbon from laser-oven-grown single-wall carbon nanotube material. It combines the well-known acid reflux treatment with water reflux and a two-stage gas phase oxidation process, the use of the intensity of the first van Hove transition relative to adsorption in the ultraviolet as a qualitative measurement of SWNT sidewall oxidation.

Phase transformations (Statistical physics), Phase transitions (Physics), Purification

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Carbon deposition and hydrocarbon formation on group VIII metal catalysts

Article Abstract:

The nickel-catalyzed formation of carbon from CO was investigated to study the complex catalytic processes associated to carbon deposition. Results revealed that the Fischer-Tropsch chemistry is regulated by the solubilities of hydrogen and carbon atoms in the catalyst metal. Higher hydrocarbons were found to only form after a dissolved carbon atom is added to a surface carbon species to form a polymerization active group.

Research, Carbon, Nickel, Hydrocarbons, Fischer-Tropsch process

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