http://hdl.handle.net/10045/2224 2013-05-23T07:25:15Z 2013-05-23T07:25:15Z Cobo, Martha Orrego, Andrés Conesa Ferrer, Juan Antonio http://hdl.handle.net/10045/25639 2012-12-13T09:45:16Z 2012-08-16T00:00:00Z

Título: Washcoated Pd/Al2O3 monoliths for the liquid phase hydrodechlorination of dioxins Autor/es: Cobo, Martha; Orrego, Andrés; Conesa Ferrer, Juan Antonio Resumen: The catalytic activity and durability of 2 wt.% Pd/Al2O3 in powder and washcoated on cordierite monoliths were examined for the liquid phase hydrodechlorination (LPHDC) of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDD/Fs), also known as dioxins. NaOH was employed as a neutralizing agent, and 2-propanol was used as a hydrogen donor and a solvent. Fresh and spent powder and monolith samples were characterized by elemental analysis, surface area, hydrogen chemisorption, scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX), and transmission electron microscopy/energy dispersive X-ray spectroscopy (TEM/EDX). Three reactor configurations were compared including the slurry and monolith batch reactors as well as the bubble loop column resulting in 100, 70, and 72% sample toxicity reduction, respectively, after 5 h of reaction. However, the slurry and monolith batch reactors lead to catalyst sample loss via a filtration process (slurry) and washcoat erosion (monolith batch), as well as rapid deactivation of the powder catalyst samples. The monolith employed in the bubble loop column remained stable and active after four reaction runs. Three preemptive regeneration methods were evaluated on spent monolith catalyst including 2-propanol washing, oxidation/reduction, and reduction. All three procedures reactivated the spent catalyst samples, but the combustion methods proved to be more efficient at eliminating the more stable poisons.

2012-08-16T00:00:00Z Conesa Ferrer, Juan Antonio Font Montesinos, Rafael http://hdl.handle.net/10045/19364 2011-11-08T01:05:42Z 2011-09-30T00:00:00Z

Título: Detección y análisis de contaminantes en diversos ambientes Autor/es: Conesa Ferrer, Juan Antonio; Font Montesinos, Rafael Resumen: En el grupo de investigación se ha puesto a punto la metodología y las técnicas analíticas necesarias para la captación, el análisis y la determinación de diferentes compuestos contaminantes en diversos ambientes. Entre los contaminantes analizados se encuentran metales pesados, gases ácidos, hidruros aromáticos policíclicos (PAHs), policlorofenoles, policlorobencenos, policloronaftalenos, policorobifenilos (PCBs) dioxinas y furanos (PCDD/Fs). Se analizan también compuestos menos peligrosos como óxidos de carbono e hidrocarburos. Se están poniendo en marcha la técnica para el análisis de las variantes bromadas de las dioxinas y furanos. Se ha llevado a cabo la captacion isocinética de estos contaminantes en diversas fuentes estacionarias como son las chimeneas de las industrias, y se han analizado también los humos contaminantes emitidos durante el uso de un vehículo diesel y un grupo electrógeno. También se han realizado determinaciones en el biogás procedente de un vertedero de RSU. Paralelamente, se está llevando a cabo un estudio de la cantidad de compuestos orgánicos volátiles (VOCs) presentes en los ambientes de trabajo de nuestro departamento, haciéndose en este caso la captación mediante muestreadores pasivos y analizando el contenido en etanol, acetona, diclorometano, hexano y otros disolventes comunes en el aire. También se están estudiando los niveles de sulfuro de hidrógeno, amoníaco y orgánicos en vertederos. Así mismo se analizan estos contaminantes en otras matrices como alimentos, tierras, lodos, compost, etc… Descripción: Presentación realizada para Química Fusión, Valencia, 29 septiembre-1 octubre 2011.

2011-09-30T00:00:00Z Conesa Ferrer, Juan Antonio Domene, Antonio http://hdl.handle.net/10045/17851 2012-03-14T07:15:00Z 2011-05-26T00:00:00Z

Título: Biomasses pyrolysis and combustion kinetics through n-th order parallel reactions Autor/es: Conesa Ferrer, Juan Antonio; Domene, Antonio Resumen: The decomposition of five different biomass samples was studied in a thermobalance. The samples consisted of esparto grass, straw, Posidonea Oceanic seaweed, waste from urban and agricultural pruning and waste of forest pruning. Both pyrolysis in inert atmosphere and combustion in the presence of oxygen were studied. Different heating rates were used and a global kinetic model, valid for all biomasses at the different conditions studied, was proposed. The kinetic model is able to fit all the runs performed with each biomass sample.

2011-05-26T00:00:00Z Conesa Ferrer, Juan Antonio Rey Martínez, Lorena Egea Ruiz, Silvia Rey Martínez, María Dolores http://hdl.handle.net/10045/17850 2012-05-31T06:03:38Z 2011-05-31T00:00:00Z

Título: Pollutant formation and emissions from cement kiln stack using a solid recovered fuel from municipal solid waste Autor/es: Conesa Ferrer, Juan Antonio; Rey Martínez, Lorena; Egea Ruiz, Silvia; Rey Martínez, María Dolores Resumen: The thermal decomposition of a Solid Recovered Fuel (SRF) has been studied by two techniques. First, laboratory-scale experiments were performed in a horizontal furnace in which different atmospheres are studied to analyze the dioxins and furans (PCDD/Fs) evolved from the decomposition of the material. Sulfur presence is revealed to be important in PCDD/Fs formation. In the second technique, the emission of various pollutants (PAHs, PCDD/Fs, metals, acid gases …) were determined in a cement kiln fed on different proportions of SRF material, and where a maximum feed rate of 15000 kg SRF/h was achieved. In the laboratory furnace the dioxin toxicity revealed a maximum when the amount of oxygen in the atmosphere increased until approximately stoichiometric conditions. In the cement kiln, all emitted pollutants are under the legal limits. No correlation between SRF input and metal emission was observed.

2011-05-31T00:00:00Z