Biogas upgrading: Optimal activated carbon properties for siloxane removal

Alba Cabrera-Codony, Miguel A. Montes-Morán, Manuel Sánchez-Polo, Maria J. Martín, Rafael Gonzalez-Olmos

Producción científica: Artículo en revista indizadaArtículorevisión exhaustiva

99 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)7187-7195
Número de páginas9
PublicaciónEnvironmental Science and Technology
Volumen48
N.º12
DOI
EstadoPublicada - 17 jun 2014
Publicado de forma externa

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