High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption
This paper presents a set of high-accuracy formulae enabling the evaluation of the compression factor, activity and cohesion energy of fluids at near-critical and super-critical temperatures, with reduced molar volumes ranging from 0.4. Such data are necessary in BET-like theoretical modelling of ad...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2007-10-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.25.8.543 |
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| author | Janina Milewska-Duda Jan Tadeusz Duda |
| author_facet | Janina Milewska-Duda Jan Tadeusz Duda |
| author_sort | Janina Milewska-Duda |
| collection | DOAJ |
| description | This paper presents a set of high-accuracy formulae enabling the evaluation of the compression factor, activity and cohesion energy of fluids at near-critical and super-critical temperatures, with reduced molar volumes ranging from 0.4. Such data are necessary in BET-like theoretical modelling of adsorption process. The proposed fluid state equation (PVT relationship) combines a theoretical description of the fluid entropy (based on a hard-sphere model) with cohesion energy relationships obtained via high-accuracy approximations of universal compression factor data and vapour-liquid equilibria. The resultant relationships are incorporated into a BET-like description of adsorption in materials of irregular microporous structure (LBET model). The set of formulae gathered together in this paper allows the possible effective calculation of adsorption isotherms at near- and super-critical temperatures relative to the pore structures. A multi-variant fitting of the LBET model to the empirical data is proposed to detect active constraints for multilayer adsorption and, hence, to obtain information on the structure of the pores. Application of the formulae to the analysis of methane and carbon dioxide adsorption onto an active carbon is discussed. |
| format | Article |
| id | doaj-art-a040d24f7cc2465a826240b1f07e8f58 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2007-10-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-a040d24f7cc2465a826240b1f07e8f582025-01-03T01:23:09ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382007-10-012510.1260/0263-6174.25.8.543High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH AdsorptionJanina Milewska-Duda0Jan Tadeusz Duda1 Faculty of Fuels and Energy, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland Faculty of Management, AGH University of Science and Technology, ul. Gramatyka 10, 30-067 Krakow, PolandThis paper presents a set of high-accuracy formulae enabling the evaluation of the compression factor, activity and cohesion energy of fluids at near-critical and super-critical temperatures, with reduced molar volumes ranging from 0.4. Such data are necessary in BET-like theoretical modelling of adsorption process. The proposed fluid state equation (PVT relationship) combines a theoretical description of the fluid entropy (based on a hard-sphere model) with cohesion energy relationships obtained via high-accuracy approximations of universal compression factor data and vapour-liquid equilibria. The resultant relationships are incorporated into a BET-like description of adsorption in materials of irregular microporous structure (LBET model). The set of formulae gathered together in this paper allows the possible effective calculation of adsorption isotherms at near- and super-critical temperatures relative to the pore structures. A multi-variant fitting of the LBET model to the empirical data is proposed to detect active constraints for multilayer adsorption and, hence, to obtain information on the structure of the pores. Application of the formulae to the analysis of methane and carbon dioxide adsorption onto an active carbon is discussed.https://doi.org/10.1260/0263-6174.25.8.543 |
| spellingShingle | Janina Milewska-Duda Jan Tadeusz Duda High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption Adsorption Science & Technology |
| title | High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption |
| title_full | High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption |
| title_fullStr | High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption |
| title_full_unstemmed | High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption |
| title_short | High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO and CH Adsorption |
| title_sort | high accuracy pvt relationships for compressed fluids and their application to bet like modelling of co and ch adsorption |
| url | https://doi.org/10.1260/0263-6174.25.8.543 |
| work_keys_str_mv | AT janinamilewskaduda highaccuracypvtrelationshipsforcompressedfluidsandtheirapplicationtobetlikemodellingofcoandchadsorption AT jantadeuszduda highaccuracypvtrelationshipsforcompressedfluidsandtheirapplicationtobetlikemodellingofcoandchadsorption |