Mexican Institute of Petroleum

About: Mexican Institute of Petroleum is a government organization based out in Mexico City, Mexico. It is known for research contribution in the topics: Catalysis & Asphaltene. The organization has 3273 authors who have published 4170 publications receiving 87269 citations.

Influence of Turbulent Flow on the Localized Corrosion Process of Mild Steel with Inhibited Aqueous Carbon Dioxide Systems

Abstract: Three percent sodium chloride (NaCl) solutions saturated with carbon dioxide (CO2) were used to study the corrosion inhibition of mild steel samples under turbulent flow conditions. The performance of cetyl trimethyl ammonium bromide (CTAB) was tested with three different concentrations (20, 60, and 100 ppm) and three different pH values (3.8, 5, and 6). The rotating cylinder electrode (RCE) was used to test different turbulent flow conditions (1,000 rpm to 5,000 rpm). It was found that the inhibitor performance is a function of concentration and pH. A localized corrosion process was found on the surface samples and further research was carried out to determine its causes. With the use of cyclic anodic polarization curves and surface examinations, it was demonstrated that the localized corrosion process does not occur at a specific rotation speed. Potentiostatic experiments simulated the effect of shear stress and the instantaneous changes in corrosion potential (Ecorr) observed when the rotation...

Highly dispersed uniformly sized Pt nanoparticles on mesoporous Al-SBA-15 by solid state impregnation

Abstract: a b s t r a c t Highly dispersed Pt nanoparticles on modified mesoporous Al-SBA-15 were obtained by a solid state impregnation (SSI) methodology, which consisted of a physical mixture of Al-SBA-15 support with a given amount of Pt(acac)2 in order to have 1 wt.% of Pt on the final solid. The solid mixture was ground vigorously and annealed at 180 ◦ C (e.g. the sublimation point of Pt(acac)2) for 0.5 h and then at 400 ◦ C in inert atmosphere, to decompose the organic ligand. The materials were characterized by X-ray diffrac- tion (XRD), transmission electron microscopy (TEM) by applying high angle annular dark field (HAADF) technique, nitrogen physisorption, pyridine adsorption by infrared spectroscopy (FTIR), X-ray photoelec- tronic spectroscopy (XPS) and FTIR of CO adsorption. Catalytic activity of Pt nanoparticles was evaluated in naphthalene hydrogenation (HYD) as test reaction. The results were compared with those obtained on Pt nanoparticles dispersed on Al-SBA-15 by wet impregnation (WI) method. Both SSI and WI meth- ods produce significant differences in the population of flat and edge sites on the Pt nanoparticles with dimensions around 1.0 nm. However, Pt nanoparticles obtained by SSI showed higher activity upon naph- thalene HYD than those obtained by WI method, which was explained by the higher density of edge sites measured by FTIR of CO adsorption. © 2011 Elsevier B.V. All rights reserved.