Synthesis and characterization of zeolites NaA and NaX from coal gangue
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Zeolites NaA and NaX were synthesized from initial coal gangue (milled sample) and pretreated coal gangue (calcinated and acid immersed sample) by an alkali fusion method prior to hydrothermal treatment, which started by mixing NaOH with coal gangue at an optimal weight ratio of nearly 1.2:1. Results show that zeolite NaA was successfully synthesized by alkali fusion at 650 and 950 °C from initial coal gangue, while zeolite NaX was synthesized by alkali fusion at 600 °C from pretreated coal gangue. Zeolites NaX with different specific surface area, external surface area, surface area of micropore and crystallinity were synthesized when the molar ratio of SiO2/Al2O3 in raw materials ranges from 3.46 to 10.0.
KeywordsZeolite NaA Zeolite NaX Coal gangue Synthesis Characterization
The research was supported by the National Natural Science Foundation of China through Grant 41271510, the Research and Development Project of Science and Technology of Shaanxi Province through Grant 2014K15-01-05, and the Fundamental Research Funds for the Central University through Grants GK201601009. We acknowledge Fuqiang Zhao, Mengmeng Zhang, Xue Xu, and Ni Zhao for their help in samples’ collection and preparation.
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