Browsing by Autor "Lucio Alejo"
Now showing 1 - 15 of 15
- Results Per Page
- Sort Options
Item type: Item , Analysis of a high-temperature heat exchanger for an externally-fired micro gas turbine(Elsevier BV, 2014) Fabiola Baina; Anders Malmquist; Lucio Alejo; Björn Palm; Torsten FranssonItem type: Item , Biodiesel from rapeseed oil (Brassica napus) by supported Li2O and MgO(Springer Nature, 2016) Jerry L. Solis; Albin Lindström Berkemar; Lucio Alejo; Yohannes KirosVegetable oils are a vast triglyceride source for biodiesel production; i.e. fatty acid methyl esters (FAME), with methanol and a catalyst via transesterification reaction. The aim of this work was to study heterogeneously catalysed biodiesel production with solid oxides such as mayenite (Ca12Al14O33) and alumina (Al2O3) as catalyst carriers using edible rapeseed oil as feedstock. These oxides were impregnated to have Li2O and MgO concentrations of 5–10 and 5–30 wt% on each carrier, respectively. The catalysts were characterized using N2-physisorption (BET/BJH), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. The synthesized catalysts were mesoporous ranging from 119 to 401 Å and their chemical phase composition was confirmed by the XRD. The catalyst coating (MgO/Li2O) was studied, along with the catalyst amount in the reactor and the assessment of the transesterification reaction kinetics. The reaction was studied at 60 °C, atmospheric pressure, agitation rate of 180 rpm, and a reaction time of 2 h in a 6:1 molar ratio of methanol to oil. For each catalyst, loadings of 2.5, 5, and 10 wt% relative to the oil weight were evaluated. The highest biodiesel yield was obtained by 5 wt% (relative to oil weight) impregnated mayenite catalyst coated with 10 wt% of Li2O. The kinetic data fits to a pseudo-first-order model having a reaction rate constant equal to 0.045 min−1 under these mild reaction conditions.Item type: Item , Biogas based polygeneration plant options utilizing dairy farms waste: A Bolivian case(Elsevier BV, 2019) J. Villarroel-Schneider; Brijesh Mainali; Jaime Martí-Herrero; Anders Malmquist; Andrew Martin; Lucio AlejoItem type: Item , Calcium and tin oxides for heterogeneous transesterification of Babasssu oil (Attalea speciosa)(Elsevier BV, 2016) Jerry L. Solis; Lucio Alejo; Yohannes KirosItem type: Item , Combustion of agricultural residues: An experimental study for small-scale applications(Elsevier BV, 2013) Evelyn Cardozo; Catharina Erlich; Lucio Alejo; Torsten FranssonItem type: Item , Comparison of the thermal power availability of different agricultural residues using a residential boiler(Springer Nature, 2016) Evelyn Cardozo; Catharina Erlich; Lucio Alejo; Torsten FranssonItem type: Item , Development and validation of a thermodynamic model for the performance analysis of a gamma Stirling engine prototype(Elsevier BV, 2015) Joseph Adhemar Araoz Ramos; Evelyn Cardozo; Marianne Salomón Popa; Lucio Alejo; Torsten FranssonItem type: Item , Effect of the fuel type on the performance of an externally fired micro gas turbine cycle(Elsevier BV, 2015) Fabiola Baina; Anders Malmquist; Lucio Alejo; Torsten FranssonItem type: Item , Ethanol Production from Schinus molle Essential Oil Extraction Residues(Springer Science+Business Media, 2019) Jerry L. Solis; Robert R. Davila; Camilo Sandoval; Daniel Guzmán; Héctor Guzmán; Lucio Alejo; Yohannes KirosThe present study determines the best conditions for the fermentation of Schinus molle drupes by the combination of different types of hydrolysis with the search for an adequate yeast strain. Schinus molle seed residues from an essential oil extraction plant (EOEP) have a high potential for ethanol production. Native yeast strains were isolated from the residues and were used to ferment the lignocellulosic residues, along with baker’s yeast (Saccharomyces cerevisiae) at 30 °C and pH 5.5 for comparison. Morphological and biochemical characterizations were carried out on the isolated yeast strains. Thermogravimetric and high-performance liquid chromatography analyses were done on the S. molle seeds (fresh and residue) to determine the ethanol production potential. The followed methodology included increasing the sugar content by hydrolysis with chemical (sulphuric acid, acetic acid, and sodium hydroxide), physical (thermal, vacuum, and ultrasound), and enzymatic treatments (amyloglucosidase and α-amylase). Once the optimum combination of yeast-hydrolysis was determined, a comparison of the greenhouse gas emissions between the original and proposed processes was done. The fermentation of the residues might replace methane from uncontrolled decomposition and reduce the solid residues in 50%/day, hence the EOEP global warming potential is reduced by 47%. The yearly income was estimated to increase by USD 2592.50 from 6302.6 L of ethanol produced from the residues.Item type: Item , Extended operability of a commercial air-staged burner using a synthetic mixture of biomass derived gas for application in an externally fired micro gas turbine(Elsevier BV, 2015) Fabiola Baina; Anders Malmquist; Lucio Alejo; Torsten FranssonItem type: Item , Integration of a wood pellet burner and a Stirling engine to produce residential heat and power(Elsevier BV, 2014) Evelyn Cardozo; Catharina Erlich; Anders Malmquist; Lucio AlejoItem type: Item , Non-ideal Stirling engine thermodynamic model suitable for the integration into overall energy systems(Elsevier BV, 2014) Joseph Adhemar Araoz Ramos; Marianne Salomón Popa; Lucio Alejo; Torsten FranssonItem type: Item , Numerical simulation for the design analysis of kinematic Stirling engines(Elsevier BV, 2015) Joseph Adhemar Araoz Ramos; Marianne Salomón Popa; Lucio Alejo; Torsten FranssonItem type: Item , Techno-economic demand projections and scenarios for the Bolivian energy system(Elsevier BV, 2017) Jenny Gabriela Peña Balderrama; Oliver Broad; R. Carlos Sevillano; Lucio Alejo; Mark HowellsItem type: Item , Techno-Economic Study of a Biogas-Based Polygeneration Plant for Small Dairy Farms in Central Bolivia(Springer International Publishing, 2019) J. Villarroel-Schneider; Brijesh Mainali; Jaime Martí-Herrero; Anders Malmquist; Andrew R. Martin; Lucio Alejo