Documents disponibles écrits par cet auteur

Transesterification of triolein to biodiesel using sodium - loaded catalysts prepared from zeolites / Yu-Yuan Wang in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 9959-9965 Titre : Transesterification of triolein to biodiesel using sodium - loaded catalysts prepared from zeolites Type de document : texte imprimé Auteurs : Yu-Yuan Wang, Auteur ; Tan Hiep Dang, Auteur ; Bing-Hung Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 9959-9965 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Zeolite  Catalyst  Transesterification Résumé : Transesterification of triolein in excess methanol over sodium-loaded catalysts prepared from Na-ion exchange with zeolites at a relatively lower reaction temperature, namely, at 60 °C, is studied in this work, Two zeolites, i.e., as-synthesized Zeolite MCM-22 and commercial Zeolite HY (CBV-780), are employed in this study. Although both zeolites show to some extent the capability of catalyzing transesterification of triolein in methanol to biodiesel, the resulting yields are only ca. 90% for CBV-780 after a 40-h reaction and 16.3% for MCM-22 after a 90-h reaction. In contrast, the conversion yields are much improved with Na-ion exchange to the surface of zeolite catalysts. For example, the yields of triolein to biodiesel have reached 98% and 99% within a 5.5-h reaction, respectively, using the NaOH-treated CBV-780 and MCM-22 catalysts, even if these NaOH-treated catalysts become amorphous and have suffered a loss of the Brunauer―Emmett―Teller surface area. Furthermore, no saponification was observed using these NaOH-treated catalysts. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201408 [article] Transesterification of triolein to biodiesel using sodium - loaded catalysts prepared from zeolites [texte imprimé] / Yu-Yuan Wang, Auteur ; Tan Hiep Dang, Auteur ; Bing-Hung Chen, Auteur . - 2012 . - pp. 9959-9965. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 9959-9965 Mots-clés : Zeolite  Catalyst  Transesterification Résumé : Transesterification of triolein in excess methanol over sodium-loaded catalysts prepared from Na-ion exchange with zeolites at a relatively lower reaction temperature, namely, at 60 °C, is studied in this work, Two zeolites, i.e., as-synthesized Zeolite MCM-22 and commercial Zeolite HY (CBV-780), are employed in this study. Although both zeolites show to some extent the capability of catalyzing transesterification of triolein in methanol to biodiesel, the resulting yields are only ca. 90% for CBV-780 after a 40-h reaction and 16.3% for MCM-22 after a 90-h reaction. In contrast, the conversion yields are much improved with Na-ion exchange to the surface of zeolite catalysts. For example, the yields of triolein to biodiesel have reached 98% and 99% within a 5.5-h reaction, respectively, using the NaOH-treated CBV-780 and MCM-22 catalysts, even if these NaOH-treated catalysts become amorphous and have suffered a loss of the Brunauer―Emmett―Teller surface area. Furthermore, no saponification was observed using these NaOH-treated catalysts. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201408

Trimethyl borate regenerated from spent sodium borohydride after hydrogen production / Cheng-Hong Liu in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9864–9869 Titre : Trimethyl borate regenerated from spent sodium borohydride after hydrogen production Type de document : texte imprimé Auteurs : Cheng-Hong Liu, Auteur ; Bing-Hung Chen, Auteur ; Duu-Jong Lee, Auteur Année de publication : 2011 Article en page(s) : pp. 9864–9869 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrogen  production Résumé : Sodium metaborate (NaBO2) is the hydrolysate of sodium borohydride (NaBH4) for hydrogen production. Trimethyl borate (B(OCH3)3), the major reactant for producing sodium borohydride via the Brown−Schlesinger process, is successfully regenerated from sodium metaborate (NaBO2) via a sequential process including reacting with sulfuric acid, cooling crystallization, and reactive esterification distillation. The metaborate is first converted to boric acid (H3BO3) by reacting with sulfuric acid, bypassing formation of borax (Na2B4O7·10H2O) required in a conventional process. Cooling crystallization is utilized to separate and purify boric acid from coexisting sodium sulfate (Na2SO4). Subsequently, trimethyl borate is formed via esterification of boric acid with methanol, in which reactive esterification distillation is adopted to facilitate the esterification and purify the product. Formation of boric acid and trimethyl borate is confirmed with X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography (GC). Approximately 55% of sodium metaborate could be converted to boric acid, along with a production yield from 74.1% to 96.5% realized for trimethyl borate esterified from the as-produced boric acid. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325809 [article] Trimethyl borate regenerated from spent sodium borohydride after hydrogen production [texte imprimé] / Cheng-Hong Liu, Auteur ; Bing-Hung Chen, Auteur ; Duu-Jong Lee, Auteur . - 2011 . - pp. 9864–9869. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9864–9869 Mots-clés : Hydrogen  production Résumé : Sodium metaborate (NaBO2) is the hydrolysate of sodium borohydride (NaBH4) for hydrogen production. Trimethyl borate (B(OCH3)3), the major reactant for producing sodium borohydride via the Brown−Schlesinger process, is successfully regenerated from sodium metaborate (NaBO2) via a sequential process including reacting with sulfuric acid, cooling crystallization, and reactive esterification distillation. The metaborate is first converted to boric acid (H3BO3) by reacting with sulfuric acid, bypassing formation of borax (Na2B4O7·10H2O) required in a conventional process. Cooling crystallization is utilized to separate and purify boric acid from coexisting sodium sulfate (Na2SO4). Subsequently, trimethyl borate is formed via esterification of boric acid with methanol, in which reactive esterification distillation is adopted to facilitate the esterification and purify the product. Formation of boric acid and trimethyl borate is confirmed with X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography (GC). Approximately 55% of sodium metaborate could be converted to boric acid, along with a production yield from 74.1% to 96.5% realized for trimethyl borate esterified from the as-produced boric acid. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325809