| A new procedure for the treatment of organochlorinated off-gases combining adsorption and catalytic hydrodechlorination. | |
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MedLine Citation:
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PMID: 19368204 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A new process for the treatment of off-gases containing chlorinated pollutants is presented in this paper. The proposed process consists of the adsorption of the chlorinated compound, followed by the regeneration of the spent adsorbent using hydrogen. Therefore, this process gathers the advantages of the conventional adsorption (useful for a wide range of emissions, even those air-diluted) and the catalytic hydrodechlorination (complete destruction of the chlorinated compound, ensuring the absence of oxidized byproduct). Since it is widely accepted that palladium is the most active phase for catalytic hydrodechlorination, this metal was supported on a given adsorbent. Different materials were tested in this work for use as adsorbents in this application (NaX, KL and ZSM-5 zeolites; activated carbons and synthetic clays), using trichloroethene as model compound. Based on their adsorption capacities, measured by temperature-programmed desorption (TPD), KL and NaX zeolites (adsorption capacity of 25 and 30 micromol/g, respectively), as well as an activated carbon (30 micromol/ g), have been selected for preparing the Pd-containing adsorbents (0.5 wt% of Pd). The most selective catalyst for the total hydrodechlorination of the adsorbed chlorinated compound was the KL supported zeolite, showing full selectivity (at a 92% conversion) for total hydrodechlorination in the hydrogen treatment of the saturated material. |
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Authors:
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Ana Elola; Eva Díaz; Salvador Ordoñez |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental science & technology Volume: 43 ISSN: 0013-936X ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2009 Mar |
Date Detail:
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Created Date: 2009-04-16 Completed Date: 2009-05-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 1999-2004 Citation Subset: IM |
Affiliation:
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Department of Chemical Engineering and Environmental Technology, University of Oviedo, Julián Claveriá s/n, 33006 Oviedo, Spain. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Air Pollutants / chemistry* Bentonite / chemistry Carbon / chemistry Catalysis Hydrocarbons, Chlorinated / chemistry* Palladium Zeolites / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Air Pollutants; 0/Hydrocarbons, Chlorinated; 1302-78-9/Bentonite; 1318-02-1/Zeolites; 7440-05-3/Palladium; 7440-44-0/Carbon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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