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Stabilization of Extra‐Large‐Pore Zeolite by Boron Substitution for the production of commercially applicable catalysts

Von Wiley-VCH zur Verfügung gestellt

Boron substitution stabilizes the extra-large-pore zeolite EWT and increases its thermal stability to 850 °C. B atoms preferentially substitute the interrupted Q3 sites and are partially converted into 3-coordination to relax framework deformation upon heating. After Al-reinsertion post-treatment, it shows higher ethylbenzene selectivity and ethylene conversion rate than commercial ZSM-5 and Beta zeolite in benzene alkylation reaction.


Abstract

Stable extra-large-pore zeolites are desirable for industrial purposes due to their ability to accommodate bulky reactants and diffusion through channels. Although there are several extra-large pore zeolites reported, stable ones are rare. Thus, their stabilization is a feasible strategy for industrial applications. Here, an extra-large-pore zeolite EWT with boron substitution is presented, and the resulting zeolite B-RZM-3 increased the thermal stability from 600 °C in its silica form to 850 °C. The crystal structure, determined by combining continuous rotation electron diffraction (cRED) and powder X-ray diffraction (PXRD), shows that B atoms preferentially substitute the interrupted (HO)T(OT)3 (Q3) sites and are partially converted into 3-coordination to relax framework deformation upon heating. After Al-reinsertion post-treatment, Al-B-RZM-3 shows higher ethylbenzene selectivity and ethylene conversion rate per mol acid site than commercial ZSM-5 and Beta zeolite in benzene alkylation reaction. Synthesizing extra-large-pore zeolite in borosilicate form is a potential approach to stabilize interrupted zeolites for commercial applications.

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