Add time:07/26/2019 Source:sciencedirect.com
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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