Publications by authors named "Barbara Pawelec"
To achieve sulfur content in gas oil at a near-zero level, new catalysts with improved hydrogenation functions are needed. In this work, new Ni-Mo-Mo hydrodesulfurization (HDS) catalysts supported by AlO-CeO materials were synthesized to evaluate their efficiency in the reaction of HDS with dibenzothiophene (DBT). AlO-CeO supports different CeO loadings (0, 5, 10 and 15 wt.
View Article and Find Full Text PDFIn this work, novel adsorbents based on 3D hierarchical silica monoliths functionalized with thiol groups were used for the removal of Hg(II) ions from an acidic aqueous solution (pH 3.5). Silica monoliths were synthesized by using two different pluronic triblock polymers (P123 and F127) to study the effect of porous structure on their sorption capacity.
View Article and Find Full Text PDFThere is a large worldwide demand for light olefins (C-C), which are needed for the production of high value-added chemicals and plastics. Light olefins can be produced by petroleum processing, direct/indirect conversion of synthesis gas (CO + H) and hydrogenation of CO. Among these methods, catalytic hydrogenation of CO is the most recently studied because it could contribute to alleviating CO emissions into the atmosphere.
View Article and Find Full Text PDFArticle Synopsis
- * This study focused on testing Disordered Mesoporous Silica 1 (DMS-1) modified with amino groups for its ability to adsorb lead ions (Pb(II)), using a sol-gel method to prepare the material.
- * The best results for removing Pb(II) were obtained with a 0.3 molar ratio of amino groups, achieving a lead removal efficiency of 99.44%, indicating this method could be a promising solution for purifying contaminated water.
Article Synopsis
- Tridimensional cubic mesoporous silica, known as SBA-16, was modified with aminopropyl groups to enhance its ability to adsorb lead (Pb) ions from water.
- The effectiveness of the adsorbent was examined based on various factors, including pH level, contact time, temperature, and the concentration of the aminopropyl compound used in its functionalization.
- Results indicated that the best Pb ion removal occurred at a pH between 5-6, after 40 minutes of contact time, and with an initial lead concentration of 200 mg/L, making the optimized 2N-SBA-16 significantly more effective than another variant, SBA-15.
In this work we report the effects of support structural properties and its modification with some metal oxides modifiers on the catalytic behavior of Au catalysts in the total CO oxidation at 20 °C. Au catalysts were supported on mesoporous silica materials (MSM) having different structural properties: Channel-like (SBA-15), cage-like (SBA-16), hexagonal (HMS), and disordered (DMS-1) structures. The effect of the modifier was evaluated by comparison of the catalytic response of the SBA-15-based catalysts modified with MgO, Fe₂O₃, TiO₂, and CeO₂.
View Article and Find Full Text PDFArticle Synopsis
- SBA-15 is a mesoporous silica material known for its highly ordered nanopores and large surface area, making it useful in various applications like catalysts and drug delivery.
- To enhance its functionality, heteroatoms and organic groups are added through different methods post-synthesis.
- This article aims to review the current research on using SBA-15 as a support for hydrodesulfurization (HDS) catalysts, focusing on its performance and modifications.