[2009.10.17]

 

   In Situ UV Raman Spectroscopic Study     on the Synthesis Mechanism of AlPO-5

 

A proposed synthesis mechanism of AlPO-5
       

UV Raman spectra recorded in situ during crystallization of AlPO-5.

 

Schematic diagram of in situ Raman cell for the monitor of organic template-containing zeolite synthesis process

   

Communication

In Situ UV Raman Spectroscopic Study on the Synthesis Mechanism of AlPO-5
 

Fengtao Fan, Zhaochi Feng, Keju Sun, Meiling Guo, Qiang Guo, Yu Song, Weixue Li, Can Li

Angew. Chem. Int. Ed., 2009, 48, 8743
 

 
Keywords

hydrothermal synthesis • Raman spectroscopy • reaction mechanisms • UV/Vis spectroscopy

Abstract

    In situ UV Raman spectroscopy has been found to be a potential tool to study the evolution of both the organic templates and inorganic framework simultaneously, thus revealing the interaction between the organic template and framework formation.

      In this manuscript, we propose, for the first time, a detailed synthesis mechanism of AlPO-5 using in situ UV Raman spectroscopy. The building blocks from the intermediates to the final crystals were well identified by taking the advantage of this powerful technique. . A very important intermediate composed of 4-membered rings for the channel formation has been detected. The intermediate was formed due to the existence of the templates which provide steric support for channel formation via its specific molecular vibrations in the very early stages. The building blocks from the intermediate to the final crystals were well identified by taking the advantage of this powerful technique. This work provides molecular-level insights into the role of the template in channel formation. We anticipate that this will facilitate the choice of organic templates and tailoring the building blocks for the rational synthesis of zeolites.