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

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Title: Washcoated Pd/Al2O3 monoliths for the liquid phase hydrodechlorination of dioxins
Authors: Cobo, Martha | Orrego, Andrés | Conesa, Juan A.
Research Group/s: Residuos, Pirólisis y Combustión
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: Pd/Al2O3 catalyst | Washcoated monoliths | Catalyst deactivation | Dioxins | Fly ash
Knowledge Area: Ingeniería Química
Issue Date: 16-Aug-2012
Publisher: Elsevier
Citation: 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
Abstract: 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.
Sponsor: 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
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcata.2012.08.004
Appears in Collections:INV - REMAN - Artículos de Revistas

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