Pore size distributions derived from adsorption isotherms, immersion calorimetry, and isosteric heats: A comparative study
Por favor, use este identificador para citar o enlazar este ítem:
http://hdl.handle.net/10045/57839
Título: | Pore size distributions derived from adsorption isotherms, immersion calorimetry, and isosteric heats: A comparative study |
---|---|
Autor/es: | Madani, S. Hadi | Hu, Cheng | Silvestre Albero, Ana | Biggs, Mark J. | Rodríguez Reinoso, Francisco | Pendleton, Phillip |
Grupo/s de investigación o GITE: | Materiales Avanzados |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Pore size distribution | Activated carbon | Adsorption isotherms | Immersion calorimetry | Isosteric heats |
Área/s de conocimiento: | Química Inorgánica |
Fecha de publicación: | ene-2016 |
Editor: | Elsevier |
Cita bibliográfica: | Carbon. 2016, 96: 1106-1113. doi:10.1016/j.carbon.2015.10.072 |
Resumen: | We compare the pore size distribution of a well-characterized activated carbon derived from model-dependent, adsorption integral equation (AIE) methods with those from model-independent, immersion calorimetry and isosteric heat analyses. The AIE approach applied to nitrogen gave a mean pore width of 0.57 nm; the CO2 distribution exhibited wider dispersion. Spherical model application to CO2 and diffusion limitations for nitrogen and argon were proposed as primary reasons for inconsistency. Immersion enthalpy revealed a sharp decrease in available area equivalent to a cut-off due to molecular exclusion when the accessible surface was assessed against probe kinetic diameter. Mean pore width was identified as 0.58 ± 0.02 nm, endorsing the underlying assumptions for the nitrogen-based AIE approach. A comparison of the zero-coverage isosteric heat of adsorption for various non-polar adsorptives by the porous test sample was compared with the same adsorptives in contact with a non-porous reference adsorbent, leading to an energy ratio or adsorption enhancement factor. A linear relationship between the energy ratio and probe kinetic diameter indicated a primary pore size at 0.59 nm. The advantage of this enthalpy, model-independent methods over AIE were due to no assumptions regarding probe molecular shape, and no assumptions for pore shape and/or connectivity. |
Patrocinador/es: | The authors thank the Australian Research Council discovery program (DP110101293) for funding support and S.H.M also thanks the University of South Australia for a postgraduate research scholarship and travel support to Alicante. C.H. acknowledges a joint scholarship provided by China Scholarship Council (CSC) and the University of Adelaide. |
URI: | http://hdl.handle.net/10045/57839 |
ISSN: | 0008-6223 (Print) | 1873-3891 (Online) |
DOI: | 10.1016/j.carbon.2015.10.072 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2015 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.carbon.2015.10.072 |
Aparece en las colecciones: | INV - LMA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
---|---|---|---|---|
2016_Madani_etal_Carbon_final.pdf | Versión final (acceso restringido) | 880,22 kB | Adobe PDF | Abrir Solicitar una copia |
Todos los documentos en RUA están protegidos por derechos de autor. Algunos derechos reservados.