The synthesis of RZM-3 zeolite with EWT topology structure using 1,1,6,6-tetramethyl-1,6-diazacyclododecane-1,6-diium dihydroxide as structure-directing agent

• Published in: Microporous and mesoporous materials Vol. 275; pp. 87 - 94
• Main Authors: Wang, Yongrui, Zhu, Jincheng, Sun, Mingyi, Wang, Lixin, Yang, Jichun, Wu, Qiao, Wang, Xiaoge, Liu, Changling, Sun, Junliang, Mu, Xuhong, Shu, Xingtian
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-02-2019
• Subjects: Catalytic property; EWT zeolite; Structure-directing agent; Synthesis; EWT zeolite; Synthesis; Structure-directing agent; Catalytic property
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2018.08.012

For the industry applications of zeolites, the pore sizes are limited between 8, 10 and 12-rings. Although there are many extra-large pore zeolites, the studies of their applications are very limited due to their low stabilities or limited catalytic sites. Here, we successfully synthesized the extra-large pore zeolite materials RZM-3 with the EWT topology with the template of TDDH in a very wide range of SiO2, Al2O3, H2O and NaOH content. The proton form of RZM-3 exhibits exceptionally high thermal and hydrothermal stability with reasonable amount of acid catalytic sites. Compared to H-ZSM-5, H-Y and KC111 resin, RZM-3 zeolite displays good catalytic activity and shape/size selectivity for the glycerol and isobutylene etherification reaction. This work shows that extra-large pore zeolites can be potentially used in industrial macromolecular conversion processes with great selectivity for the first time.
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•The RZM-3 could be synthesized with TDDH.•The RZM-3 exhibits high thermal and hydrothermal stability.•The RZM-3 shows good catalytic property in the etherification reaction.