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Catalytic Wet Air Oxidation (CWAO) of Phenol in a Fixed Bed Reactor Using Supported Ru and Ru‐Au Catalysts: Effect of Gold and Ce Loading
Author(s) -
IzquierdoColorado Armando,
TorresTorres Gilberto,
GamboaRodríguez María Teresa,
SilahuaPavón Adib Abiu,
ArévaloPérez Juan C.,
CervantesUribe Adrián,
CorderoGarcía Adrián,
Beltramini Jorge N.
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802958
Subject(s) - catalysis , x ray photoelectron spectroscopy , oxidizing agent , selectivity , desorption , ruthenium , chemistry , inorganic chemistry , adsorption , wet oxidation , nuclear chemistry , chemical engineering , organic chemistry , engineering
Catalysts of Ru and Ru−Au prepared by the wet impregnation and Deposition‐Precipitation methods supported on ZrO 2 modified by CeO 2 (10 and 20 wt%) synthetized by sol‐gel method, in order to study Au and CeO 2 addition effect in the catalytic wet air oxidation of phenol, carried out in an automatized continuous fixed‐bed reactor using oxygen as an oxidizing source. Characterizations of the catalysts were made by X‐ray Diffraction (XRD), Specific Surface Area (BET), X‐ray Photoelectron Spectroscopy (XPS), Transmission Electronic Microscopy ( TEM) , Scanning Electronic Microscopy (SEM), Ultraviolet – visible Spectroscopy (UV‐vis) and Temperature Programmed Desorption of Ammonia (NH 3 ‐TPD). The effect of Au is reflected in the selectivity to CO 2 of the catalysts Ru‐ZrO 2 and Ru−Au‐ZrO 2 with the increase in selectivity from 89 to 95% related to the increase in acidity which increases from 70 to 102 (μmol of NH 3 / gCat). Ce loading effect in this case was important to the enhance the CO 2 selectivity explained by the formation of Ce 4+ ‐O 2− ‐M that could favor the oxygen transfer between the catalyst surface and the adsorbed species by a redox mechanism.