Micromesoporous Activated Carbons as Catalysts for the Efficient Oxidation of Aqueous Sulfide.

KOH activation of a mesophase pitch produces very efficient carbons for the removal of sulfide in aqueous solution, increasing the sulfur oxidation rate with the degree of activation of the carbon. These carbons are characterized by their graphitic structures, with domains of sizes of around 20 nm, and a moderate concentration of surface oxygen groups (0.2-0.

Formation of CO(x)-free H2 and cup-stacked carbon nanotubes over nano-Ni dispersed single wall carbon nanohorns.

Transitional metals (M) were dispersed on single-wall carbon nanohorns (M/SWCNHs, M = Fe, Co, Ni, Cu) by simple thermal treatment of the deposited metal nitrate without H(2) reduction. Nanometallic Ni particles on SWCNH were evidenced by high-resolution transmission electron microscopic observation and X-ray photoelectron spectroscopy. The nano-Ni dispersed on SWCNH showed the highest CH(4) decomposition activity; the activity of used transitional metals decreases in the order Ni ≫ Co > Fe ≫ Cu.

Adsorption on heterogeneous surfaces: site energy distribution functions from Fritz-Schlüender isotherms.

Different site energy distribution functions based on the condensation approximation method are proposed for the liquid-phase or gas-phase adsorption equilibrium data following the Fritz-Schlüender isotherm. Energy distribution functions for the four limiting cases of the Fritz-Schlüender isotherm are also discussed. The proposed models are successfully applied to the experimental equilibrium data of nitrogen molecules at 77 K on a pitch-based activated carbon (PA) and a pitch-based activated carbon containing boron (PBA).