Accelerating syngas-to-aromatic conversion via spontaneously monodispersed Fe in ZnCr₂O₄ spinel.

ABSTRACT: Spontaneous monodispersion of reducible active species (e.g., Fe, Co) and their stabilization in reductive atmospheres remain a key challenge in catalytic syngas chemistry. In this study, we present a series of catalysts including spontaneously monodispersed and enriched Fe on ZnCr₂O₄. Deep investigation shows remarkable performance in the syngas-to-aromatic reaction only when monodispersed Fe coupled with a H-ZSM-5 zeolite. Monodispersed Fe increases the turnover frequency from 0.14 to 0.48 s^-1 without sacrificing the record high selectivity of total aromatics (80-90%) at a single pass. The increased activity is ascribed to more efficient activation of CO and H₂ at oxygen vacancy nearest to the isolated Fe site and the prevention of carbide form

SUBMITTER: Tian G 

PROVIDER: S-EPMC9500042 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature