Pore-mouth catalysis boosting the formation of iso-paraffins from syngas over bifunctional catalysts

Recent studies confirm that the emerging bifunctional catalysts consisting of metal oxide and zeolites can directly convert syngas into high-quality gasoline, however, formation mechanism iso-paraffins difference with conventional FT/zeolite catalyst have not been investigated. Herein, three one-dimensional SAPO diverse micropore sizes were synthesized assembled ZnAlOx spinel structure. It was found ZnAlOx/SAPO-41 ZnAlOx/SAPO-11 medium favored C5–C11 hydrocarbons a high content iso-paraffins. The characterizations pointed out over SAPO-11 followed pore-mouth catalysis mechanism, which means isomerization linear only take place near pore mouth region zeolites. This allows mono-branched in range, are less prone to be cracked than their di-branched isomers. A careful comparative analysis between Co/H-meso-ZSM-5 also made terms product distribution, activity, stability.