Spatial Distribution of Zeolite ZSM-5 within Catalyst Bodies Affects Selectivity and Stability of Methanol-to-Hydrocarbons Conversion

Solid acids, such as zeolites, are used as catalyst materials in a wide variety of important crude oil refinery, bulk chemical synthesis, and green processes. Examples include fluid catalytic cracking (FCC),[1] methanol-to-hydrocarbons (MTH) conversion,[ 2] plastic waste valorization,[3] and biomass catalysis.[4] Industrially, these solid acid catalysts are used as composite materials with the zeolite particles as active components heterogeneously dispersed within a matrix of binders and fillers (alumina or porous solids) then shaped into micro- or millimetersized catalyst bodies.[5] It is known that these matrix materials extend the lifetime of the active zeolite component by providing mechanical strength and protection against poisoning as well as by enhancing heat dissipation and mass transport.