Catalysis with enzymes and zeolites have in common the presence of well-defined single active sites and pockets/cavities where the reaction transition states can be stabilized by longer-range interactions. We show here that for a complex reaction, such as the conversion of methanol-to-olefins (MTO), it is possible to synthesize reaction-adapted zeolites by using mimics of the key molecular species involved in the MTO mechanism. Effort has focused on the intermediates of the paring mechanism because the paring is less favoured energetically than the side-chain route. All the organic structure-directing agents based on intermediate mimics crystallize cage-based small-pore zeolitic materials, all of them capable of performing the MTO reaction. Among the zeolites obtained, RTH favours the whole reaction steps following the paring route and gives the highest propylene/ethylene ratio compared to traditional CHA-related zeolites (3.07 and 0.86, respectively).
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This work was supported by the European Union through ERC-AdG-2014-671093 (SynCatMatch), the Spanish Government-MINECO through Severo Ochoa (SEV-2016-0683) and MAT2015-71261-R. The Electron Microscopy Service of the Universitat Politècnica de València (UPV) is acknowledged for their help in sample characterization. C.L. acknowledges the China Scholarship Council for a PhD fellowship.
Supplementary Figures 1–24, Supplementary Tables 1–6, Supplementary Methods, Supplementary References
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Nature Catalysis (2018)