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Biogas upgrading: Optimal activated carbon properties for siloxane removal

A total of 12 commercial activated carbons (ACs) have been tested for the removal of octamethylcyclotetrasiloxane (D4) in dynamic adsorption experiments using different carrier gases and D4 concentrations. Characterization of the ACs included several physical and chemical techniques. The D4 adsorption capacities were strongly related with the textural development of the ACs. Results showed that the optimum adsorbent for D4 is a wood-based chemically activated carbon, which rendered an adsorption capacity of 1732 ± 93 mg g-1 using 1000 ppm (v/v) of D4 with dry N2 as the carrier gas. When the concentration of D4 was lowered to typical values found in biogas, the adsorption capacity was halved. The presence of major biogas compounds (i.e., CH4 and CO2) and humidity further reduced the D4 adsorption capacity. The polymerization of D4 over the surface of all ACs was found to be relevant after prolonged contact times. The extent of this phenomenon, which may negatively affect the thermal regeneration of the AC, correlated reasonably well with the presence of phenolic and carboxylic groups on the carbon surfaces

This work was funded by the Ministerio de Innovacion y Ciencia (MICINN) (SIRENA CTQ2011-24114 and NOVE-DAR CSD2007-00055). Alba Cabrera-Codony thanks Generalitat de Catalunya DEC for her predoctoral grant (2013F1_B100054). Rafael Gonzalez-Olmos also thanks MICINN for his Juan de la Cierva fellowship (JCI-2010-07104)

© Environmental Science and Technology, 2014, vol. 48, núm. 12, p. 7187-7195

American Chemical Society (ACS)

Author: Cabrera-Codony, Alba
Montes Morán, Miguel A.
Sánchez-Polo, Manuel
Martín, María José
González Olmos, Rafael
Date: 2014 June 2
Abstract: A total of 12 commercial activated carbons (ACs) have been tested for the removal of octamethylcyclotetrasiloxane (D4) in dynamic adsorption experiments using different carrier gases and D4 concentrations. Characterization of the ACs included several physical and chemical techniques. The D4 adsorption capacities were strongly related with the textural development of the ACs. Results showed that the optimum adsorbent for D4 is a wood-based chemically activated carbon, which rendered an adsorption capacity of 1732 ± 93 mg g-1 using 1000 ppm (v/v) of D4 with dry N2 as the carrier gas. When the concentration of D4 was lowered to typical values found in biogas, the adsorption capacity was halved. The presence of major biogas compounds (i.e., CH4 and CO2) and humidity further reduced the D4 adsorption capacity. The polymerization of D4 over the surface of all ACs was found to be relevant after prolonged contact times. The extent of this phenomenon, which may negatively affect the thermal regeneration of the AC, correlated reasonably well with the presence of phenolic and carboxylic groups on the carbon surfaces
This work was funded by the Ministerio de Innovacion y Ciencia (MICINN) (SIRENA CTQ2011-24114 and NOVE-DAR CSD2007-00055). Alba Cabrera-Codony thanks Generalitat de Catalunya DEC for her predoctoral grant (2013F1_B100054). Rafael Gonzalez-Olmos also thanks MICINN for his Juan de la Cierva fellowship (JCI-2010-07104)
Format: application/pdf
ISSN: 0013-936X (versió paper)
1520-5851 (versió electrònica)
Document access: http://hdl.handle.net/10256/11281
Language: eng
Publisher: American Chemical Society (ACS)
Collection: MICINN/PN 2012-2015/CTQ2011-24114
MEC/PN 2007-2013/CSD2007-00055
AGAUR/2013FI-B100054
Reproducció digital del document publicat a: http://dx.doi.org/10.1021/es501274a
Articles publicats (D-EQATA)
Is part of: © Environmental Science and Technology, 2014, vol. 48, núm. 12, p. 7187-7195
Rights: Tots els drets reservats
Subject: Carbó activat
Carbon, Activated
Biogàs
Biogas
Aigües residuals -- Plantes de tractament
Sewage disposal plants
Title: Biogas upgrading: Optimal activated carbon properties for siloxane removal
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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