Insights into effects of ZrO2 crystal phase on syngas-to-olefin conversion over ZnO/ZrO2 and SAPO-34 composite catalysts

The utilization of metal oxide-zeolite catalysts in the syngas-to-olefin reaction is a promising strategy for producing C2–C4 olefins from non-petroleum resources. However, effect crystal phase oxides on catalytic activity these still ambiguous. Herein, typical (ZnO/ZrO2) with different phases (monoclinic (m-ZrO2) and tetragonal (t-ZrO2)) were employed syngas conversion. (ZnO/m-ZrO2+SAPO-34) composite catalyst exhibited 80.5% selectivity at CO conversion 27.9%, where results are superior to those (CO 16.4% olefin 76.1%) obtained over (ZnO/t-ZrO2+SAPO-34). distinct differences ascribed larger number hydroxyl groups, Lewis acid sites, oxygen defects ZnO/m-ZrO2 compared ZnO/t-ZrO2. These features result formation more formate methoxy intermediate species during conversion, followed by light SAPO-34. present findings provide useful information design highly efficient ZrO2-based