Biodiesel is produced by the transesterification of oil triglycerides with methanol or ethanol, in presence a homogeneous heterogeneous catalyst. This study aims to report results sunflower produce biodiesel using CaO nanoparticles supported on NaX zeolite as The effect concentration surface was studied range 5−25 wt %. reaction carried out at reflux temperature methanol, atmospheric pressure, time 6 h, and 6:1 molar ratio oil. Catalyst characterization X-ray diffraction, scanning electron...

Presently, the use of fossil fuels is not ecologically sustainable, which results in need for new alternative energies such as biodiesel. This work presents a review classification lipidic feedstocks and catalysts biodiesel production. It also pros cons different processes through obtained. In this context, cooking oil (WCO) has emerged an with high potential making process sustainable. A detected limitation to achieving content free fatty acids (FFA) existing problems related homogeneous...

The objective of this study was to prepare bifunctional catalysts based on iron and CaO test them in the biodiesel production using waste cooking oil (WCO) as feedstock. Two precursors were studied, Fe2O3 Fe(NO3)3·9H2O. identified crystalline phases Ca2Fe2O5 CaFeO3. Surface morphology textural properties (distribution active species, specific surface area, size, pore volume) also analyzed. Additionally, thermal stability studied 800 °C established optimum calcination temperature. density...

Biodiesel is emerging as an alternative fuel with several advantages over the common petroleum based fuels. In its production, however, variables such raw material, catalyst, and co-solvent are issue worth exploring because of impact they have on final biodiesel properties. Therefore, this work aims to establish effect aforesaid methyl ester content, viscosity, acidity, water content produced from castor oil. context, methanolysis oil has been conducted at 60 °C in a batch reactor, three...

In the present study, glycerol was oxidized by photocatalysis to glyceraldehyde, formaldehyde, and formic acid. Copper-doped TiO2 synthesized evaporation-induced self-assembly approach it used as catalyst during photo-oxidation reactions. The prepared mesoporous material exhibited high specific surface area (242 m2/g) band gap energy reduction of 2.55 eV compared pure titania (3.2 eV) synthesis method due presence copper cations (Cu2+ identified XPS). showed only anatase crystalline phase...

Lithium extraction from the Li-excess Li1.10Mn1.90O4 spinel has been performed by chemical and electrochemical methods in aqueous organic media, respectively. De-lithiated samples have investigated XRD, SEM, TG, (7)Li (1)H MAS-NMR techniques. The comparative study allowed demonstrating that intermediate de-intercalated prepared during acid titration are similar to those way a non-aqueous electrolyte. LiMn2O4 based with tailored de-lithiation degree can be as single phase controlling pH used...

Even if many aspects of three-dimensionally ordered macroporous (3DOM) titania have been extensively studied, the interplay between amorphous and crystalline components their skeleton wall has not attracted too much attention, although it should strongly influence properties these materials. In order to gain new insight on this interplay, we studied in detail structure three 3DOM samples prepared by heating precursor at 673, 773, 873 K X-ray diffraction, thermogravimetric analysis,...

This work aimed to study and model the kinetics of transesterification canola oil with methanol catalyzed by calcined quicklime (CaO + MgO). The influence three main variables was studied at 328 K: reagents order addition (has a negligible effect on reaction), methanol-oil molar ratio minor reaction rate after 1.5 h reaction) catalyst loading (high rate) achieve least triglycerides conversion 96.5% in concordance norm EN 14103. A kinetic based an Eley-Rideal mechanism found well fit (R2 =...

The role on filiform corrosion (FFC), after an automotive painting process with a phosphate treatment, of the near surface deformed layer (NSDL) formed during mechanical processing AA8006 aluminium alloys is investigated. Samples subjected to specific pretreatments are examined before and different steps phosphating in order identify characteristics NSDL that responsible for susceptibility FFC. thickness, structure composition this determined by SEM, RBS, XPS transmission electron...

La llegada del COVID-19 modificó la vida cotidiana de población mundial, incrementando los casos trastornos mentales como ansiedad y depresión. Los episodios deben acompañarse un malestar clínico significativo o deterioro social escolar para volverse diagnóstico clínico, siendo adolescentes uno grupos vulnerables, por lo tanto, el objetivo esta investigación fue identificar funcionalidad global en con previo trastorno y/o depresión durante nueva normalidad post COVID-19, mediante Children’s...

Infrared spectra of sodium and potassium alkaline-metal nitrates magnesium calcium alkali-earth in solid phase had been recorded order to assign the fundamental bands. The influence dispersal médium (alkaline halide), employed sample preparation have discussed. quantitative measurements band ten sities at 1387 cm-1 (present I.R. four KBr médium) allowed us determine Lambert-Beer law slopes for each compound. These values are differents (bearing mind experimental random errors), so we could...

Este trabajo es el resultado de la evaluación los reportes las estancias profesionales estudiantes del Programa Educativo Ingeniero Químico, generaciones 2001-06 a 2006-2011, para identificar principales funciones que desempeñan en sus profesionales, áreas donde se insertan y sector contrata. La información recabada un indicador grado pertinencia currículo programa. Se determinó 82 % alumnos colocaron industrias tienen ver con su perfil profesional egreso; destacan calidad, ingeniería...

La Universidad Autónoma del Estado de México (UAEM), en su plan desarrollo 2005-2009, establece como propósito mejorar calidad, cobertura y pertinencia sus programas educativos; lo que requiere estudios sobre alumnos, ejercicio profesional egresados, grado satisfacción empleadores evolución los sectores actividades inserción laboral, con la finalidad responder a las demandas sociedad. Todo esto se ha referido relevancia social, través entrevistas cuestionarios aplicados informantes clave.

Since Sony commercialized the first Li-ion battery (LIB) in 1992, this technology has steadily grown, and nowadays LIBs are state of art commercial rechargeable batteries. In fact, billions cells building by year to power portable electronic devices more recently electric cars (EV PHEVs). Besides very promising candidates meet demands electrochemical storage for renewable energies sources. Widely publicized hazardous incidents recalls have raised legitimate concerns regarding safety,...