Insight into the Evolution Track for the Metathesis of Alkenes within Hierarchical Zeolite-Based Catalysts

The usage of hierarchical MFI zeolite enables a boost of the catalytic performance of Mo-based catalysts for the olefin-metathesis reaction. The harvest of active catalysts roots in a segmental evolution track between hierarchical zeolite and Al2O3 slices for the fabrication of active sites. The working evolution track requires the indispensable engagements from intracrystalline mesoporous surface, Al2O3 slices, and zeolitic Bronsted acid sites. The infilling of disaggregated Al2O3 slices into the intracrystalline mesopores triggers the creation of localized intrazeolite-Al2O3 interfaces, which enables the subsequent migration and trapping of surface molybdates into the micropores. The insulation of intrazeolite-Al2O3 interface or shielding of zeolitic Bronsted acid sites leads to the break of the evolution track. Our findings disclose the hidden functionality of mesoporosity as intrazeolite interface boundary for the fabrication of active sites and supply a new strategy for the rational design of zeolite catalysts.

Automated summary

The usage of hierarchical MFI zeolite enhances the catalytic performance of Mo-based catalysts for the olefin-metathesis reaction. The active catalysts are obtained through a segmental evolution track between hierarchical zeolite and Al2O3 slices for the formation of active sites. The working evolution track requires the engagement of intracrystalline mesoporous surface, Al2O3 slices, and zeolitic Bronsted acid sites.