Abstract
The zincosilicate analog of zeolite mordenite was hydrothermally synthesized in the presence of citric acid and characterized with several spectroscopic techniques. The zeolite thus prepared had a higher crystallinity and Zn concentration in the framework compared with the one obtained in the absence of citric acid. XRD and FTIR provided evidence for the incorporation of Zn in the framework. Results of XAFS indicated a tetrahedral structure of Zn in the lattice framework with a Zn–O distance of 0.1938 nm. It is speculated that the citric acid might decrease the concentration of Zn 2+ in the synthesis mixture, thereby preventing the unfavorable formation of oxide or hydroxide species.
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