Díez Alcántara, Eduardo

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First Name
Last Name
Díez Alcántara
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Ingeniería Química y de Materiales
Ingeniería Química
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Now showing 1 - 10 of 11
  • Publication
    Mesoporous low silica X (MLSX) zeolite: Mesoporosity in loewenstein limit?
    (Elsevier, 2022-12) Gómez Martín, José María; Montes, Ignacio; Díez Alcántara, Eduardo; Rodríguez Rodríguez, Araceli
    Synthesis of Low Silica X zeolite (LSX) with hierarchical porosity was achieved. The low silicon/aluminum ratio of this zeolite allowed to increase the number of active sites, as cationic positions (>25%) respect to the previous mesoporous X zeolite. Mesoporosity was induced by using sodium dodecylbenzene sulfonate (SDBS) during the synthesis. A dissolution time of 24 h for SDBS improved the zeolite crystallinity, maintaining the FAU characteristic framework, with a silicon/aluminum molar ratio near the unity (<1.1), limit of the Lowenstein’ rule. The surfactant removal at 773 K promoted the development of a wider pore size distribution. The heating rate highly determined the pore size distribution, resulting in a bimodal distribution (maxima at 80 Å and 290 Å) at low heating rate (1.3 K/min) and a unimodal distribution, with a maximum at 230 Å, at higher heating rate (8 K/min). The analysis by Transmission Electronic Microscopy (TEM) showed the mesoporous cavities in the zeolite nanoparticles. These cavities were generated by the SDBS spherical micelles removal. Mesoporous Low Silica X zeolite (MLSX) showed higher catalytic activity than the same zeolite without mesoporosity in the deoxygenation of oleic acid. The conversion reached a constant value around 100% with higher yield toward C9–C18 hydrocarbons, representative fraction of sustainable aviation fuel (SAF). Therefore, this new mesoporous low silica X zeolite (MLSX) has a significant potential use as catalyst in the processing of bulky molecules.
  • Publication
    Sequential separation of cobalt and lithium by sorption: Sorbent set selection
    (Elsevier, 2022-09-24) Conte Erustes, Naby; Gómez Martín, José María; Díez Alcántara, Eduardo; Sáez González, Patricia; Monago García, José Ignacio; Espinosa, Anna; Rodríguez Rodríguez, Araceli
    The sorption of cobalt and lithium was studied using low-cost natural (dolomite, diatomite, barite), commercial (13X zeolites and clinoptilolite) and synthesized (mesoporous carbon and NaY zeolite) sorbents. The pH of the medium was a key factor in the sorption process which can be modified due to the active chemical groups on the surface of the sorbents. Therefore, the doses of each sorbent were selected to avoid cobalt precipitation, working at pH below 8. Sorption with monometallic solution was carried out to select the best set of sorbents for subsequent selective separation. Only mesoporous activated carbon and dolomite allow to achieve significant cobalt removal, 85% and 65% respectively, with negligible lithium removal. 13X zeolite (high surface area and low Si/ Al molar ratio) removed both metals without selectivity. Therefore, dolomite and mesoporous activated carbon were selected for the selective separation of cobalt, as they allow to achieve an adsorbed Co2+/Li+ weight ratio of 16 and 4, respectively. 13X was selected to remove lithium once cobalt was removed from the solution. The best separation was carried out by a two-sequential sorption stage, using dolomite in a first stage to separate cobalt and 13X zeolite in a second stage to remove lithium, reaching an almost complete removal of both metals. The pH control for working with high doses of dolomite was achieved by means of a solid phase pH buffer (solid buffer) composed by a mixture of the dolomite itself and non-activated mesoporous carbon (without sorption capacity) in a 1:4 weight ratio. This solid buffer allowed the pH of the medium to be controlled to around 6.5.
  • Publication
    Sustainable Recovery of Cobalt from Aqueous Solutions Using an Optimized Mesoporous Carbon
    (Springer, 2023-01-10) Conte Erustes, Naby; Díez Alcántara, Eduardo; Almendras, Brigitte; Gómez Martín, José María; Rodríguez Rodríguez, Araceli
    The aim of this paper is to employ a factorial design to optimize the activation step in the synthesis process of a mesoporous-activated carbon to be used as adsorbent for removing and recovering cobalt ions from aqueous solutions. This activation has been carried out in a tubular furnace in the presence of an air stream, following a 23 factorial design. According to the obtained results, the best activation conditions to reach a maximum cobalt removal are mild conditions, low activation temperatures and large times, while the air flow seems to be positive influence working in a low level. This is due to the enhancement of superficial oxygenated groups formation in these conditions, responsible of the adsorption process. The kinetic curve obtained for the adsorbent prepared at the most favorable conditions showed that the adsorption process was very fast and efficient, reaching equilibrium in 15 min, and was properly described by a pseudo-second-order kinetic, typical of the processes in which there are no diffusion limitations. Additionally, with the aim of studying the potential of metal recovery, desorption studies were performed. Sulfuric acid as stripping agent led to twofold Co preconcentration ratio, by reducing the desorption volume to the quarter.
  • Publication
    Zeolite Adsorbents for Selective Removal of Co(II) and Li(I) from Aqueous Solutions
    (MDPI, 2023) Díez Alcántara, Eduardo; Redondo, Cinthya; Gómez Martín, José María; Miranda Carreño, Rubén; Rodríguez Rodríguez, Araceli
    Cobalt and lithium are critical metals because of its shortage, difficulty of extraction and huge economic impact due to their market value. The purpose of this work is to study their selective removal from aqueous solutions in different conditions using two commercial FAU zeolites as adsorbent materials. These solids were characterized by XRD, XRF and BET analysis, to follow up of their FAU structure integrity, their Si/Al ratio, and their specific surface area evolutions through their preparation process. The kinetic study indicates that using both zeolites with a dosage of 5 g/L a 100% cobalt removal from aqueous solutions is achievable, while lithium removal is kept around 30% (separation factor of 3.33). This selectivity is important as these two metals frequently appear together in leaching solutions form, for example, ion-Li batteries. In relation to the adsorption equilibrium, cobalt adsorption presents a finite adsorption capacity while this behavior is not observed in lithium adsorption. For this reason, Langmuir model is the most adequate to represent cobalt adsorption, while lithium adsorption is better represented by Freundlich model.
  • Publication
    H-Clinoptilolite as an Efficient and Low-Cost Adsorbent for Batch and Continuous Gallium Removal from Aqueous Solutions
    (Springer Nature, 2021-10-04) Sáez González, Patricia; Rodríguez Rodríguez, Araceli; Gómez Martín, José María; Paramio, C.; Fraile, C.; Díez Alcántara, Eduardo
    In this paper, the gallium (III) ions’ adsorption onto protonated clinoptilolite (H-CLP) was investigated both in batch and fxed-bed column experiments. Regarding batch experiments, the infuence of some parameters such as adsorbent dosage, size particle, and temperature was studied, determining that a dosage of 10 g/L for an initial pollutant concentration of 40 mg/L leads to a removal percentage over 85% regardless of particle size and temperature. On the other hand, adsorption of gallium onto H-CPL is an endothermic and spontaneous process in the studied temperature range, concluding that the maximum adsorption capacity was 16 mg/g for 60 °C. Concerning to the efect of the presence of other cations in solution, such as Na+, K+, or Ca2+, gallium adsorption capacity only drops by 20%, although the initial concentration of other cations in the solution is 50 times higher than gallium concentration. This means that clinoptilolite has a high afnity for gallium which can be very favorable for further selectivity tests. A crucial factor for this high selectivity could be the protonation of clinoptilolite which allows working without modifying the pH of the aqueous solution with acid. In the fxed-bed experiments, breakthrough curves were obtained, and the efect of operation variables was determined. A breakpoint value of 254 min for 64 g of adsorbent and fow rate of 9.0 mL/min (7.0 BV/h) were obtained, when treating a pollutant volume of 33 BV. Additionally, the breakthrough curves were ftted to diferent models to study the particle size efect, being the best ft corresponding to the Adams–Bohart model. This fact confrmed the infuence of particle size on adsorption kinetics.
  • Publication
    Aprendizaje basado en retos, una metodología enfocada a la generación Z de estudiantes de Mecánica de Fluidos en el Grado en Ingeniería Química
    (2021-06) Díez Alcántara, Eduardo; Rodríguez Rodríguez, Araceli; Gómez Martín, José María; Prieto Serrano, Javier; Redondo Soto, Cinthya
  • Publication
    Desarrollo de materiales y herramientas para la aplicación de aula inversa, aprendizaje colaborativo y autoaprendizaje en asignaturas del Grado y Máster en Ingeniería Químicas
    (2019-06-25) Rodríguez Rodríguez, Araceli; Díez Alcántara, Eduardo; Gómez Martín, José María; Sáez González, Patricia; Bernabé Virseda, Ignacio; Díaz Moreno, Ismael
    El objetivo del proyecto es desarrollar materiales (hojas de cálculo, apuntes, encuestas) que permitan una implantación de metodologías basadas en aula inversa y aprendizaje cooperativo en las asignaturas Operaciones con Sólidos y Mecánica de Fluidos.
  • Publication
    Acercamiento al mundo laboral de la nueva Generación Z de estudiantes del Máster en Ingeniería Química mediante aprendizaje basado en retos y mentorías en el marco del desarrollo sostenible
    Rodríguez Rodríguez, Araceli; Díez Alcántara, Eduardo; Miranda Carreño, Rubén; Gómez Martín, José María; Galán del Álamo, José; Rojas Contreras, Francisco José; Tierno Recio, Marcos; Turnay Alvarez, Santiago; Ramos Irala, Santiago; Alvarez, Rodrigo; Conte Erustes, Naby
    Esta metodología (ABR) que se ha empleado en la parte teórica de la asignatura “Estancias en empresas y centros de investigación” del máster en Ingeniería Química: Ingeniería de Procesos en la UCM. La metodología implica el establecimiento de un panel de expertos, la definición de los retos a resolver, la configuración de los grupos de trabajo, la realización de distintas actividades para resolver el reto, y la exposición pública del mismo. La evaluación de la metodología se realizó mediante una encuesta a los alumnos cuyas conclusiones más relevantes son que, a pesar de que consideraban que era necesario mucho esfuerzo, los estudiantes pensaban que la metodología era interesante. Entre las actividades llevadas a cabo, las visitas a plantas industriales fueron las más valoradas, mientras que la preparación de un CV resultó la menos atractiva para los estudiantes
  • Publication
    Desarrollo de recursos didácticos adaptados para la Generación Z en el ámbito de la Ingeniería Química
    (2020-06-24) Domínguez Toribio, Juan Carlos; Alonso Rubio, María Virginia; Díez Alcántara, Eduardo; Gómez Martín, José María; Guijarro Gil, María Isabel; Ladero Galán, Miguel; Miranda Carreño, Rubén; Oliet Palá, María Mercedes; Rodríguez Rodríguez, Araceli; Rodríguez Vega, Sergio; Santos Mazorra, Victoria Eugenía; Toledo Gabriel, José Manuel; Yustos Cuesta, Pedro; Lorenzo Fernández, David; Rigual Hernández, Victoria de los Ángeles; Wojtusik Wojtusik, Mateusz; Villar Chavero, María del Mar; Monago García, José Ignacio; Hipólito Ruiz, Carmen Myriam de; Sánchez Hombre, Paloma; Díaz Moreno, Ismael
    En este Proyecto Innova-docencia se van a elaborar una serie de recursos didácticos que sirvan de apoyo a la docencia presencial y virtual de asignaturas del área de la Ingeniería Química a nivel de Grado y de Máster enfocados a la Generación Z.
  • Publication
    Inmersión de los estudiantes de Ingeniería Química en un mundo laboral determinado por los ODS mediante aprendizaje basado en el caso con un mentor del ámbito industrial
    (2022) Díez Alcántara, Eduardo; Díaz Moreno, Ismael; Gómez Martín, José María; Gómez Sánchez, Adrián Casimiro; González Gómez, Emilio José; Guerrero Moreno, Elisa; Leal García, José Luis; Moreno Gómez, Andrea; Ramos Irala, Santiago; Redondo Soto, Cinthya; Rodríguez Rodríguez, Araceli
    El objetivo es utilizar el aprendizaje basado en el caso en la asignatura "Operaciones con sólidos" para acercar a los estudiantes a la realidad industrial determinada por la sostenibilidad, mediante un caso práctico con la participación de un mentor del ámbito industrial.