Washcoated Pd/Al2O3 monoliths for the liquid phase hydrodechlorination of dioxins

Empreu sempre aquest identificador per citar o enllaçar aquest ítem http://hdl.handle.net/10045/25639
Información del item - Informació de l'item - Item information
Títol: Washcoated Pd/Al2O3 monoliths for the liquid phase hydrodechlorination of dioxins
Autors: Cobo, Martha | Orrego, Andrés | Conesa, Juan A.
Grups d'investigació o GITE: Residuos, Pirólisis y Combustión
Centre, Departament o Servei: Universidad de Alicante. Departamento de Ingeniería Química
Paraules clau: Pd/Al2O3 catalyst | Washcoated monoliths | Catalyst deactivation | Dioxins | Fly ash
Àrees de coneixement: Ingeniería Química
Data de publicació: 16-d’agost-2012
Editor: Elsevier
Citació bibliogràfica: COBO, Martha; ORREGO, Andrés; CONESA, Juan A. "Washcoated Pd/Al2O3 monoliths for the liquid phase hydrodechlorination of dioxins". Applied Catalysis A: General. Vol. 445-446 (28 Nov. 2012). ISSN 0926-860X, pp. 83-91
Resum: 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.
Patrocinadors: University of La Sabana, University of Antioquia, and the University of Alicante.
URI: http://hdl.handle.net/10045/25639
ISSN: 0926-860X (Print) | 1873-3875 (Online)
DOI: 10.1016/j.apcata.2012.08.004
Idioma: eng
Tipus: info:eu-repo/semantics/article
Revisió científica: si
Versió de l'editor: http://dx.doi.org/10.1016/j.apcata.2012.08.004
Apareix a la col·lecció: INV - REMAN - Artículos de Revistas

Arxius per aquest ítem:
Arxius per aquest ítem:
Arxiu Descripció Tamany Format  
ThumbnailCobo_etal_Washcoated_final.pdfVersión final (acceso restringido)1,27 MBAdobe PDFObrir     Sol·licitar una còpia
ThumbnailCobo_etal_Washcoated.pdfVersión revisada (acceso abierto)1,17 MBAdobe PDFObrir Vista prèvia


Tots els documents dipositats a RUA estan protegits per drets d'autors. Alguns drets reservats.