J.C. Vargas

Hydrogen production by ethanol steam reforming. Study of cobalt-doped Ce-Zr catalysts.

Insertion of cobalt into Ce-Zr fluorite oxides is studied to provide active and selective catalysts for ethanol steam reforming. The controlled reduction of cobalt generates nanometric cobalt particles in strong interaction with the host oxide it comes from. High selectivity to hydrogen can be achieved compared to Ce-Zr fluorite oxides.

Influence of the preparation conditions of Ca doped Ni/olivine catalysts on the improvement of gas quality produced by biomass gasification

Abstract The influence of the preparation conditions (impregnation and calcination temperatures, and calcium content) on the catalytic behaviour of Ni-CaO/olivine catalysts, prepared by wet impregnation method, in the elimination of non interesting by-products (CO 2 , CH 4 ) produced from biomass gasification was studied. To select the preparation parameters and to understand their influence, several physicochemical analyses such as zetametry, DTA, XRD, TPR and SEM, were performed. The methane dry reforming and subsequently the modified dry reforming in presence of H 2 and CO, reproducing the gas-effluent composition after air-wood gasification process, were carried out.

Simulation Of An Active Packaging With Catalytic Oxidation Of Ethylene For 'Cavendish' Banana

In the ripening and senescence of fruits, ethylene plays a major role and therefore, its control is essential to extend the shelf-life of these products. In this study, the kinetics of catalytic oxidation of ethylene was experimentally determined for a catalyst of gold nanoparticles supported on cerium oxides and the use of this was simulated in a perforated rigid packaging system for ‘Cavendish’ bananas. According to the simulations performed, for 1 kg of fruit in the active packaging 5.931 g of the obtained catalyst are needed to reduce 99% of the ethylene concentration at 12°C and with constant concentrations of 0.072 of O 2 and 0.178 of CO 2 (in molar fraction).