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Synthesis of Zeolite W from Various Aging Times: Characterization, H+ Ion Exchange and Enhanced Catalytic Activity for Methanol Dehydration to Dimethyl Ether

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Abstract

Zeolites W were prepared from various aging times in the precursor gel by a hydrothermal method, then ion-exchanged to be H-formed catalysts. The products were characterized and the corresponding H+-exchanged zeolite crystals were compared as catalysts for methanol dehydration. The results revealed that the aging step prior to crystallization strongly affected the crystal morphology and Si/Al atom ratio of zeolite samples. Zeolites W obtained transferred from twin-ball to bouquet-like in shape with aging time increased from 0 to 24 h, the Si/Al atom ratios of zeolite samples were measured to be 4.2, 4.2, 4.0, 3.8, 3.7, and 3.7 for the synthesis gel with the aging time of 0, 2, 3, 6, 12, and 24 h, respectively. Zeolite W kept its crystal structure after H+ exchange, however, the introduction of H+ ions into zeolite would result in a decrease in the intensity of all crystallographic reflexes. Moreover, the corresponding H+-exchanged zeolite crystals with longer aging time in the precursor gel were shown to exhibit better catalytic activities for dehydration of methanol to DME, the reason may be due to the low Si/Al ratio which meant more aluminum incorporated in the zeolite framework, resulting in its higher acidity.

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ACKNOWLEDGMENTS

This work was supported by the College Natural Science Foundation of Henan Province (17B530004).

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Correspondence to Xu Zhang.

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Zhang, X., Yang, S. & Liu, Q. Synthesis of Zeolite W from Various Aging Times: Characterization, H+ Ion Exchange and Enhanced Catalytic Activity for Methanol Dehydration to Dimethyl Ether. Pet. Chem. 63, 176–182 (2023). https://doi.org/10.1134/S0965544123020214

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