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Selective Catalytic Reduction (SCR) catalysts coated on diesel particulate Filter, SCR-F, have been introduced for automotive applications in the last years due to the capability of reducing NOx and PM simultaneously below the limits imposed by emission regulations. In this context, the performance of a commercial silicon carbide Cu/zeolite SCR-F for controlling NOx emissions in an automotive diesel...
In this work, we report the catalytic activity of V2O5/TiO2, V2O5-WO3/TiO2 and WO3/TiO2-nanotube model catalysts in removing NO with NH3 via the SCR process. The catalytic activity includes the effect of SO2 and H2O. We also analyze the effect of WO3 and V2O5 loading upon the surface acidity of the nanotubes, and the effect of WO3 on the V4+/V5+ ratio, and its correlation with the catalytic activity...
The application of more stringent emission regulations for passenger cars in Asian and South American countries is challenging due to the presence of low-quality diesel fuel, which enhances the risk of deactivation of aftertreatment systems due to its higher sulfur content. In this context, the impact of high sulfur fuel on the performance of a close-coupled Diesel Oxidation Catalyst (DOC) and Diesel...
The removal of dyes from water effluents is an actual challenge in the wastewater treatment. The complete degradation of organic pollutants into gaseous CO2 and inorganic ions (mineralization) is desirable. Generally, photocatalysis and adsorption are used to achieve this aim. However, it is difficult to reach the complete mineralization of dyes. In the present work, the removal of the commercial...
Two series of SBA-16-supported CoMoW ternary sulfide catalysts with atomic ratio r=Mo/(Mo+W) ranging from 0.3 to 0.7 were prepared by the simultaneous impregnation of SBA-16andphosphated-SBA-16 substrates with metal precursors. The samples were characterized by a variety of techniques (chemical analysis, N2 physisorption, SEM, XRD, DRS UV–vis, TPR, TPD-NH3, Raman spectroscopy, HRTEM, XPS and coke...
Sn-modified TiO2 powders with different amounts of tin (0, 2.4, 5.1 and 7.2at.%) were obtained by the surfactant-assisted technique using Pluronic P123 as template. The synthesis procedure favors the formation of a mixture anatase/rutile at annealing temperatures as low as 350°C. The incorporation and further increase of the tin content promotes the transformation of anatase to rutile phase allowing...
The microstructural evolution of Duplex Stainless Steel 2205 was investigated during Gas Tungsten Arc Welding with three types of protective atmosphere: (a) Ultra-high purity Ar, (b) 98% Ar-2% N2 mixture, and (c) 95% Ar-5% N2 mixture. The microstructural evolution was also characterized for three different heat inputs: low, medium, and high (0.5, 1.5, and 2.5Jmm−1. In terms of the effect of fatigue...
This study aimed to develop a lubricant from chicken fat and biodiesel, using additives to meet the standards of physicochemical and environmental quality of the ISO 15380-2012.The raw material was extracted directly from chicken skin; using two methods: autoclaving and direct heating, being the latter which generated the higher extraction yield (52.06%). Fat purification (physical refining) was performed...
In the present work, two series of Ni catalysts supported on SBA-15 were prepared: the first one using Ni(II) complex with ethylenediaminetetraacetic acid (EDTA) as a precursor and the second one using nickel(II) nitrate aqueous solutions. Nickel loading in the catalysts varied between 1 and 20wt.%. The aim of the study was to evaluate the effect of the addition of EDTA on the characteristics of the...
This work evaluated the redesign of an Upflow Anaerobic Sludge Blanket (UASB) bioreactor to increase biogas production from anaerobic digestion of vinasse and compared the redesign UASB bioreactor with a conventional UASB design. Vinasse contains a high level of organic matter, 120.2±18.4gO2/L of chemical organic demand (COD), and a 0.8 biodegradability index (BI). Thus, vinasse is a potential nutrient...
In the present work, a series of NiMo catalysts supported on hybrid materials consisting of mesoporous TiSBA-15 and conventional γ-alumina were prepared. Three hybrid supports were synthesized with 20, 40 and 60wt.% of TiSBA-15 and compared to pure γ-Al2O3 and TiSBA-15 counterparts. NiMo catalysts were prepared by incipient wetness co-impregnation of aqueous solutions of ammonium heptamolybdate and...
5-Hydroxymethylfurfural (HMF) has been identified as a potential candidate for biofuels and a high-potential intermediate chemical compound. The obtention of HMF from fructose is efficiently carried out using acid catalysts. In this work, a new catalyst of alumina synthesized by sol-gel as support was bifunctionalized with thiol (SH) and sulfonic (SO3−) groups by the grafting method and compared with...
The degradation of phenol was studied under three chemical environments, ozonation (O3), electro-oxidation (EO) and ozonation-electro-oxidation (O3-EO) coupled process. The parent compound concentration was established by UV–Vis spectrophotometry while the by-products were identified by HPLC. This allowed proposing a mechanism of phenol oxidation during the coupled process. This coupled process was...
This paper is devoted to the study of oil-containing residue (oil-slime) pyrolysis process in the presence of cobalt chloride as a catalyst. A mixture consisting of crude oil (20wt.%) and silica (80wt.%) was used as a model substrate. The pyrolysis process carried out at a temperature 500°C in nitrogen atmosphere in the presence of 5wt.% of CoCl2 allowed obtaining an optimal gaseous, liquid and solid...
This research shows the results of the coupling of two advanced oxidation processes for the degradation of pesticide Thiodan® in water. Electrooxidation process with diamond electrodes doped with boron (BDD) alone removed 97% of COD in 100min of reaction time. Furthermore, the process of ozonation only removed 77% removal of COD, in the same reaction time. However, when the processes are coupled,...
W-doped TiO2 and Mo-doped TiO2 photocatalysts were synthesized by EISA method and were characterized by different techniques. The photoactivity of these materials was evaluated by the degradation of 4-chlorophenol without oxygen supply. The catalysts exhibited only anatase crystalline phase and high specific surface areas of about 179m2g−1. The amount of dopant cations in TiO2 was a key parameter...
Wood-derived bio-oil was investigated as a feedstock for the production of renewable hydrocarbons over commercial hydrotreating CoMoS and NiMoS catalysts. Alumina-supported CoMoS active phase showed better selectivity to diesel-like products than NiMoS phase and higher activity in removal of gaseous intermediates (COx) by hydrogenation. This reaction can play an important role in the reduction of...
In this work, four calcium-containing materials (calcium hydroxide, commercial hydrated lime, calcium oxide and calcium carbonate) were evaluated as catalysts in the photodegradation of Rhodamine 6G (Rh6G) under UV radiation. The effect of catalyst concentration, reaction time and pH were evaluated. Materials were characterized by X-ray powder diffraction, thermogravimetric analysis, Scanning Electron...
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