Author, as appears in the article.: Hammedi, T; Bensouilah, R; Ouakouak, A; Llorca, J; Cabello, FM; Ksibi, Z
Department: Enginyeria Química
URV's Author/s: Medina Cabello, Francisco
Keywords: Waste-water Tio2 Support effects Sol-gel processing Sol-gel Ru catalysts Reduction Phenol P-hydroxybenzoic acid Nox Model Degradation Cwao Acetic-acid
Abstract: The catalytic wet air oxidation (CWAO) of p-hydroxybenzoic acid (p-HBA) was conducted in a batch reactor at 140 degrees C, and at a total air pressure of 50 bar over Ru-based catalysts. Four materials were selected as supports - TiO2, CeO2-TiO2, ZrO2-TiO2, and La2O3-TiO2 - all of which had mesopores in their texture and pollutant adsorption capacities. The supports were prepared by the sol-gel method, and then impregnated with 3 wt% of Ru precursor. Such characterization techniques as N2-sorption, XRD, XPS, H2-TPR, NH3-TPD, TEM, and HAADF-STEM were used to analyze the different solids. The correlation between catalytic activities and physicochemical properties was discussed. A significant specific surface area (SBET), a large amount of surfaceactive oxygen, and Lewis acidity sites were observed on cerium-containing catalysts (Ru/CeTi). Fresh Ru catalysts containing cerium showed higher activity than Ru/TiO2, Ru/ZrTi, and Ru/LaTi catalysts. It is assumed that the acidic sites and surface oxygen trap the p-HBA molecule, thus increasing the catalytic properties of the Ru particles which interact with the surface oxygen through the cerium redox process (Ce3+/Ce4+). As the presence of cerium increases surface-active oxygen, it inhibits the deposition of carbon on the surface of the Ru catalyst. The pseudo-second order (PSO) model adequately described the kinetic data of the p-HBA oxidation reaction using Ru catalysts.
Thematic Areas: Multidisciplinary sciences Multidisciplinary Medicina i Ciências biológicas ii Ciências biológicas i Biotecnología
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: francesc.medina@urv.cat
Author identifier: 0000-0002-3111-1542
Record's date: 2024-01-29
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://www.sciencedirect.com/science/article/pii/S2405844023080830
Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Heliyon. 9 (10):
APA: Hammedi, T; Bensouilah, R; Ouakouak, A; Llorca, J; Cabello, FM; Ksibi, Z (2023). Study of the catalytic wet air oxidation of p-hydroxybenzoic acid on a fresh ruthenium catalyst supported by different oxides. Heliyon, 9(10), -. DOI: 10.1016/j.heliyon.2023.e20875
Article's DOI: 10.1016/j.heliyon.2023.e20875
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications
Repositori URV