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Updated: Oct 25, 2026

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Enhanced alkene productivity in methanol-to-hydrocarbons conversion using a secondary catalyst component and hydrogen
Matteo Vanni1, Andreas Brenig2, Adam H Clark3
1PSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Abstract:
The methanol-to-hydrocarbons conversion over unidimensional 10-membered ring zeolites offers an attractive route to produce C3-C5 alkenes, central building blocks for the production of sustainable aviation fuels. However, the application of such zeolites is limited by a rapid deactivation due to coke formation. We present a novel catalyst design concept to significantly enhance coke resistance, achieved by physically mixing the zeolite with a secondary catalyst component exhibiting hydrogenation activity and operating under near ambient-pressure hydrogen co-feeds. Among the tested materials, Pd/SiO2 provides the highest stability enhancement, leading up to 10× higher cumulative productivity of C3-C5 alkenes, and outperforming a bifunctional Pd-loaded zeolite. The enhancement is observed across a broad range of hydrogen concentrations and zeolite:Pd/SiO2 weight ratios, offering flexibility to minimize hydrogen and Pd use. Kinetic and spectroscopic investigations reveal that Pd intercepts coke-forming intermediates, such as formaldehyde and dienes, thereby reducing the rate of internal and external coke deposition.
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