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Hydrothermal synthesis of titanium silicalite-1 structurally directed by hexamethyleneimine / Haijiao Zhang in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4334–4339 Titre : Hydrothermal synthesis of titanium silicalite-1 structurally directed by hexamethyleneimine Type de document : texte imprimé Auteurs : Haijiao Zhang, Auteur ; Yueming Liu, Auteur ; Zheng Jiao, Auteur Année de publication : 2009 Article en page(s) : pp. 4334–4339 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Titanium  silicalite-1  Hexamethyleneimine  Active  seeds Résumé : Titanium silicalite-1 (TS-1) with the MFI topology has been synthesized successfully in the absence of alkali metal ions with the cooperative effects of active seeds and the structure-directing agent hexamethyleneimine (HMI). The physicochemical properties and structures of the products were characterized by various techniques. The coexistence of HMI and primary and/or secondary building units of the MFI structure in the synthesitic gels was essential for the nucleation and crystallization of TS-1. The nature and preparation conditions of the seed precursors had a great influence on the crystallization process and the incorporation of titanium atoms into the framework. It was found that a synergistic effect between HMI and the precursor seeds led to the full crystallization of TS-1. Other synthesis parameters such as boron addition, silicon source, and crystallization time were also investigated. Moreover, the present synthesis system is also applicable to the preparation of other MFI analogues. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8016253 [article] Hydrothermal synthesis of titanium silicalite-1 structurally directed by hexamethyleneimine [texte imprimé] / Haijiao Zhang, Auteur ; Yueming Liu, Auteur ; Zheng Jiao, Auteur . - 2009 . - pp. 4334–4339. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4334–4339 Mots-clés : Titanium  silicalite-1  Hexamethyleneimine  Active  seeds Résumé : Titanium silicalite-1 (TS-1) with the MFI topology has been synthesized successfully in the absence of alkali metal ions with the cooperative effects of active seeds and the structure-directing agent hexamethyleneimine (HMI). The physicochemical properties and structures of the products were characterized by various techniques. The coexistence of HMI and primary and/or secondary building units of the MFI structure in the synthesitic gels was essential for the nucleation and crystallization of TS-1. The nature and preparation conditions of the seed precursors had a great influence on the crystallization process and the incorporation of titanium atoms into the framework. It was found that a synergistic effect between HMI and the precursor seeds led to the full crystallization of TS-1. Other synthesis parameters such as boron addition, silicon source, and crystallization time were also investigated. Moreover, the present synthesis system is also applicable to the preparation of other MFI analogues. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8016253