A.A.H. Kadhum

Adsorption of carbon monoxide on activated carbon-tin ligand

Abstract Activated carbon was impregnated with 34.57% SnCl 2 ·2H 2 O salt and then dried at 180°C to produce AC–SnO 2 to improve its adsorptive interaction with CO. Besides the fact that activated carbon has its original different pore sizes for normal gas phase CO adsorption (as in the case of pure carbon), the impregnated carbon has additional CO adsorption ability due to the presence of O − (ads) on the active sites. AC–SnO 2 proved to be a superior adsorber of CO than pure carbon when used for H 2 purification in a PSA system. Discernibly, the high adsorptive selectivity of AC–SnO 2 towards gas phase CO portrays a good future for the applicability of this noble adsorbent, since CO has become a notorious threat to the global ecosystem due to the current level of air pollution.

Removal of CO from process gas with Sn–activated carbon in pressure swing adsorption

A pressure swing adsorption (PSA) system using activated carbon impregnated with SnCl 2·2H 2 O and pure activated carbon was used to remove CO from a model H 2/CO mixture representing the steam reformer process gas. On comparing PSA results for both carbons, the CO adsorptive capacity of impregnated carbon was found to be superior to that of the pure carbon. This was confirmed by the fact that the concentration of CO, initially at 1000 ppm, was successfully reduced to 4.02% and 1.04% of its initial concentration by the pure and the impregnated activated carbons respectively in the PSA system. The species in the impregnated carbon responsible for the improved gas phase CO adsorption was found to be SnO 2. Simulation results at a cyclic time of 600 s in the PSA operating at 10 atmospheres gave a product recovery and purity of 99.99% and 57.48%, respectively. At 6 atmospheres, the product recovery and purity were 92.17% and 77.12%, respectively. © 2000 Society of Chemical Industry

Effect of nitrogen-doping concentration in carbon nanotubes on cathodic performance for proton exchange membrane fuel cell

Electrode fabricated by N-doped carbon nanotubes has been identified as a potential catalyst for proton exchange membrane fuel cell (PEMFC) application. N-doped carbon nanotubes have shown their ability in electro-reduction of oxygen at the fuel cell cathode. This paper presents a study on the effect of nitrogen-doping level in carbon nanotubes towards the reduction of oxygen. The half cell test studied using cyclic voltammetry analysis has shown a linear relationship between the nitrogen-doping degree in CNT and the cathodic activity. The sample which exhibited the highest cathodic activity was character by its higher structural defects on the surface that is responsible to serve as the active sites for cathodic oxygen reduction reaction.