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Acidic medium synthesis of zeolites - an avenue to control the structure-directing power of organic templates.
Fu, Guangying; Dib, Eddy; Lang, Qiaolin; Zhao, Haonuan; Wang, Songxia; Ding, Ruiqin; Yang, Xiaobo; Valtchev, Valentin.
Afiliación
  • Fu G; The ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Laoshan District, CN-266101 Qingdao, China. yangxb@qibebt.ac.cn.
  • Dib E; Normandie University, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, F-14000 Caen, France. valentin.valtchev@ensicaen.fr.
  • Lang Q; The ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Laoshan District, CN-266101 Qingdao, China. yangxb@qibebt.ac.cn.
  • Zhao H; The ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Laoshan District, CN-266101 Qingdao, China. yangxb@qibebt.ac.cn.
  • Wang S; Normandie University, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, F-14000 Caen, France. valentin.valtchev@ensicaen.fr.
  • Ding R; The ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Laoshan District, CN-266101 Qingdao, China. yangxb@qibebt.ac.cn.
  • Yang X; The ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Laoshan District, CN-266101 Qingdao, China. yangxb@qibebt.ac.cn.
  • Valtchev V; The ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Laoshan District, CN-266101 Qingdao, China. yangxb@qibebt.ac.cn.
Dalton Trans ; 51(30): 11499-11506, 2022 Aug 02.
Article en En | MEDLINE | ID: mdl-35833567
This paper deals with the extension of the synthesis field of microporous zeolite-type materials and types of organic structure-directing agents (OSDA) that can be used to promote their crystallization. The highly hydrophilic hexamethylenetetramine (urotropine), with its C/N ratio = 1.5, which is unusual to act as a structure-directing agent in the crystallization of open-framework silica polymorphs, is used to exemplify the novelty of the employed approach. Namely, the protonation of urotropine in an acidic fluorine-containing medium transforms it into a very efficient OSDA that yields dodecasil 3C (MTN-type). This novel synthesis also allows gaining insights into OSDA-framework interactions in the MTN-type structure. The comprehensive 29Si and 19F MAS NMR indicate a small number of point defects of the framework T sites and the multiple bonding of F- ions to Si in a disordered manner. Based on this finding, a unit cell model has been generated using Monte Carlo simulation and validated with Rietveld refinement using experimental powder X-ray diffraction data. In the model, protonated urotropine cations are located in the center of the big hexakaidecahedral [51264] cages at full occupancy with random orientations. The charge balance is provided by the disordered F- ions.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Dalton Trans Asunto de la revista: QUIMICA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Dalton Trans Asunto de la revista: QUIMICA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido