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Simultaneous effect of oxygen impurity and flow rate of purge gas on adsorption capacity of and heel buildup on activated carbon during cyclic adsorption-desorption of VOC.
Rahmani, Keivan; Haghighat Mamaghani, Alireza; Peyravi, Arman; Hashisho, Zaher; Crompton, David; Anderson, James E.
Afiliación
  • Rahmani K; University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada.
  • Haghighat Mamaghani A; University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada.
  • Peyravi A; University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada.
  • Hashisho Z; University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada. Electronic address: hashisho@ualberta.ca.
  • Crompton D; Ford Motor Company, Environmental Quality Office, Dearborn, MI 48126, United States.
  • Anderson JE; Ford Motor Company, Research and Advanced Engineering, Dearborn, MI 48121, United States.
J Hazard Mater ; 476: 135223, 2024 Sep 05.
Article en En | MEDLINE | ID: mdl-39029183
ABSTRACT
Irreversible adsorption, or heel buildup, negatively impacts activated carbon performance and shortens its lifetime. This study elucidates the interconnections between flow rate and the oxygen impurity of desorption purge gas with heel buildup on beaded activated carbon (BAC). Nine thermal desorption scenarios were explored, varying nitrogen purge gas oxygen impurity levels (<5 ppmv, 10,000 ppmv, 210,000 ppm (21 %)) and flow rates (0.1, 1, 10 SLPM or 1 %, 10 %, 100 % of adsorption flow rate) during thermal desorption. Results reveal that increasing purge gas flow rate improves adsorption capacity recovery and mitigates adverse effects of purge gas oxygen impurity. Cumulative heel increased with higher purge gas oxygen impurity and lower flow rates. In the least effective regeneration scenario (0.1 SLPM N2, 21 % O2), a 32.8 wt% cumulative heel formed on BAC after five cycles, while the best-case scenario (10 SLPM N2, <5 ppmv O2) resulted in only 0.3 wt%. Comparing the pore size distributions of virgin and used BAC shows that heel initially forms in narrow micropores (<8.5Å) and later engages mesopores. Thermogravimetric analysis (TGA) showed that oxygen impurity creates high boiling point and/or strongly bound heel species. TGA confirmed that higher purge gas flow rates reduce heel amounts but encourage chemisorbed heel formation in oxygen's presence. These findings can guide optimization of regeneration conditions, enhancing activated carbon's long-term performance in cyclic adsorption processes.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Países Bajos