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A new dubinin−radushkevich-modified BET combined equation to correlate with a single procedure the full relative pressure range of 77 K N2 isotherms of solids with different textural properties / Antonio Marcilla in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10820–10826 Titre : A new dubinin−radushkevich-modified BET combined equation to correlate with a single procedure the full relative pressure range of 77 K N2 isotherms of solids with different textural properties Type de document : texte imprimé Auteurs : Antonio Marcilla, Auteur ; Amparo Gómez-Siurana, Auteur ; Francisco J. Valdés, Auteur Année de publication : 2010 Article en page(s) : pp. 10820–10826 Note générale : Industial chemistry Langues : Anglais (eng) Mots-clés : A  New  Dubinin−Radushkevich-Modified--BET--Combined--Equation--Correlate--Single  Procedure--Full  Relative--Pressure--Range--77  K  N2  Isotherms--Solids--Different--Textural--Properties Résumé : In this work, a model capable of adequately correlating and reproducing experimental adsorption isotherm data in the overall relative pressure range is suggested. The equation includes a Dubinin−Radushkevich term and a modified BET term that avoids the discontinuity of BET equation at high relative pressures. Thus, the typical independent application of the Dubinin−Radushkevich and BET equations, involving the need of a selection of the respective relative pressure range, is substituted by a single optimization procedure, permitting the calculation of the values of the parameters characterizing the textural properties of solids. The validity of the procedure has been checked through its application to several experimental examples, corresponding to types I, II, and IV isotherms, showing excellent results in all of the cases. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900912x [article] A new dubinin−radushkevich-modified BET combined equation to correlate with a single procedure the full relative pressure range of 77 K N2 isotherms of solids with different textural properties [texte imprimé] / Antonio Marcilla, Auteur ; Amparo Gómez-Siurana, Auteur ; Francisco J. Valdés, Auteur . - 2010 . - pp. 10820–10826. Industial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10820–10826 Mots-clés : A  New  Dubinin−Radushkevich-Modified--BET--Combined--Equation--Correlate--Single  Procedure--Full  Relative--Pressure--Range--77  K  N2  Isotherms--Solids--Different--Textural--Properties Résumé : In this work, a model capable of adequately correlating and reproducing experimental adsorption isotherm data in the overall relative pressure range is suggested. The equation includes a Dubinin−Radushkevich term and a modified BET term that avoids the discontinuity of BET equation at high relative pressures. Thus, the typical independent application of the Dubinin−Radushkevich and BET equations, involving the need of a selection of the respective relative pressure range, is substituted by a single optimization procedure, permitting the calculation of the values of the parameters characterizing the textural properties of solids. The validity of the procedure has been checked through its application to several experimental examples, corresponding to types I, II, and IV isotherms, showing excellent results in all of the cases. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900912x

A new Dubinin-Radushkevich-modified BET combined equation to correlate with a single procedure the full relative pressure range of 77 K N2 isotherms of solids with different textural properties / Antonio Marcilla in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10820–10826 Titre : A new Dubinin-Radushkevich-modified BET combined equation to correlate with a single procedure the full relative pressure range of 77 K N2 isotherms of solids with different textural properties Type de document : texte imprimé Auteurs : Antonio Marcilla, Auteur ; Amparo Gómez-Siurana, Auteur ; Francisco J. Valdés, Auteur Année de publication : 2010 Article en page(s) : pp. 10820–10826 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Adsorption  isotherm  data  Dubinin−Radushkevich  equations  BET  equations Résumé : In this work, a model capable of adequately correlating and reproducing experimental adsorption isotherm data in the overall relative pressure range is suggested. The equation includes a Dubinin−Radushkevich term and a modified BET term that avoids the discontinuity of BET equation at high relative pressures. Thus, the typical independent application of the Dubinin−Radushkevich and BET equations, involving the need of a selection of the respective relative pressure range, is substituted by a single optimization procedure, permitting the calculation of the values of the parameters characterizing the textural properties of solids. The validity of the procedure has been checked through its application to several experimental examples, corresponding to types I, II, and IV isotherms, showing excellent results in all of the cases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900912x [article] A new Dubinin-Radushkevich-modified BET combined equation to correlate with a single procedure the full relative pressure range of 77 K N2 isotherms of solids with different textural properties [texte imprimé] / Antonio Marcilla, Auteur ; Amparo Gómez-Siurana, Auteur ; Francisco J. Valdés, Auteur . - 2010 . - pp. 10820–10826. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10820–10826 Mots-clés : Adsorption  isotherm  data  Dubinin−Radushkevich  equations  BET  equations Résumé : In this work, a model capable of adequately correlating and reproducing experimental adsorption isotherm data in the overall relative pressure range is suggested. The equation includes a Dubinin−Radushkevich term and a modified BET term that avoids the discontinuity of BET equation at high relative pressures. Thus, the typical independent application of the Dubinin−Radushkevich and BET equations, involving the need of a selection of the respective relative pressure range, is substituted by a single optimization procedure, permitting the calculation of the values of the parameters characterizing the textural properties of solids. The validity of the procedure has been checked through its application to several experimental examples, corresponding to types I, II, and IV isotherms, showing excellent results in all of the cases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900912x

New heterogeneous catalytic transesterification of vegetable and used frying oil / Maria del Remedio Hernandez in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9068-9076 Titre : New heterogeneous catalytic transesterification of vegetable and used frying oil Type de document : texte imprimé Auteurs : Maria del Remedio Hernandez, Auteur ; Juan A. Reyes-Labarta, Auteur ; Francisco J. Valdés, Auteur Année de publication : 2010 Article en page(s) : pp. 9068-9076 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Edible  species  Transesterification  Catalytic  reaction Résumé : In the present work, a new heterogeneous catalyst for oil transesterification with methanol has been developed. The catalyst is based on the introduction of sodium in calcined hydrotalcite. Two different raw materials have been used to determine the usefulness of this new catalyst: sunflower oil and used frying oil from a university restaurant. In this way, the efficiency of the new heterogeneous catalyst by using an urban residue was tested. Different parameters that can modify the extension of the transesterification reaction have been evaluated. Results obtained at 60 °C show that hydrotalcite modified with sodium presents adequate characteristics for this kind of reactions with both raw materials evaluated. An important factor observed in the present study is that no soap was formed in any of the reactions carried out, even in the case of used oil with high acid index. The iodine index of biodiesel generated with waste cooking oil presents values within the limits established by general biodiesel specifications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23289638 [article] New heterogeneous catalytic transesterification of vegetable and used frying oil [texte imprimé] / Maria del Remedio Hernandez, Auteur ; Juan A. Reyes-Labarta, Auteur ; Francisco J. Valdés, Auteur . - 2010 . - pp. 9068-9076. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9068-9076 Mots-clés : Edible  species  Transesterification  Catalytic  reaction Résumé : In the present work, a new heterogeneous catalyst for oil transesterification with methanol has been developed. The catalyst is based on the introduction of sodium in calcined hydrotalcite. Two different raw materials have been used to determine the usefulness of this new catalyst: sunflower oil and used frying oil from a university restaurant. In this way, the efficiency of the new heterogeneous catalyst by using an urban residue was tested. Different parameters that can modify the extension of the transesterification reaction have been evaluated. Results obtained at 60 °C show that hydrotalcite modified with sodium presents adequate characteristics for this kind of reactions with both raw materials evaluated. An important factor observed in the present study is that no soap was formed in any of the reactions carried out, even in the case of used oil with high acid index. The iodine index of biodiesel generated with waste cooking oil presents values within the limits established by general biodiesel specifications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23289638