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Synthesis and characterization of large, pure mordenite crystals

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Abstract

Large, pure mordenite (MOR) crystals were synthesized hydrothermally using silicic acid powder as the silica source, and the synthesized MOR samples were characterized by XRD and SEM techniques. The effects of several synthesis parameters, such as particle size and heat pre-treatment temperature of the used silicic acid powder as well as SiO2/Al2O3 molar ratio and alkalinity in the synthesis solution, on the formation of MOR crystals were systematically investigated. The results indicate that the low solubility of the silicic acid powder, resulting from the use of the powder with large particle sizes or its heat pre-treatment at high temperatures, leads to the formation of unwanted α-SiO2 phase. Additionally, a low ratio of SiO2 to Al2O3 and a high alkalinity in the synthesis solution can result in the formation of analcime-type (ANA) zeolite. Large, pure prismatic MOR crystals with uniform size and shape can be synthesized hydrothermally at a high ratio of SiO2 to Al2O3 and a low alkalinity in the synthesis solution using silicic acid powder with fine particle sizes without heat pre-treatment as the silica source. The synthesized MOR crystals with acid treatment can significantly enhance their micropore accessibility.

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Acknowledgments

The financial supports by the National Natural Science Foundation of China (20,871,104, 20,971,109, and 21,036,006), the Program for Changjiang Scholars and Innovative Research Team in Chinese Universities (IRT0980), and the Natural Science Foundation of Zhejiang Province, China (R4080084) are gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, Peolpe’s Republic of China

    Chunhui Xu, Yuping Guo, Qiang Xiao, Yijun Zhong & Weidong Zhu

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  1. Chunhui Xu
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  2. Yuping Guo
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  3. Qiang Xiao
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  4. Yijun Zhong
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  5. Weidong Zhu
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Correspondence to Weidong Zhu.

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Xu, C., Guo, Y., Xiao, Q. et al. Synthesis and characterization of large, pure mordenite crystals. J Porous Mater 19, 847–852 (2012). https://doi.org/10.1007/s10934-011-9539-9

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