Nano-Hollow Zeolite-Encapsulated Highly Dispersed Ultra-Fine Fe Nanoparticles as Fischer-Tropsch Catalyst for Syngas-to-Olefins

A nano-hollow zeolite-encapsulating ultra-fine Fe nanoparticle catalyst denoted as Fe@Sn-h-HT was successfully synthesized through a simple water steam treatment of the Fe@Sn-h catalyst prepared by the dissolution-recrystallization (D-R) method. The Fe@Sn-h-HT catalyst had a hierarchical porous structure and a high dispersion of Fe2O3 particles with a size of 3.4 nm. Furthermore, the results of several characterization methods, such as XRD, HAADF-STEM, and H-2-TPR, further demonstrated the transformation of the skeleton Fe in Fe@Sn-h into Fe2O3, which was uniformly dispersed in the Fe@Sn-h-HT catalyst. Meanwhile, Fe@Sn-h-HT had significantly higher selectivity and yield of C-2-C-4(=) than the reference catalysts Fe/S and Fe@Sn-h, which provided strong proof for the confined catalysis of the metal@zeolite catalyst.

Automated summary

A nano-hollow zeolite-encapsulating ultra-fine Fe nanoparticle catalyst, Fe@Sn-h-HT, was synthesized via water steam treatment of the Fe@Sn-h catalyst prepared by the dissolution-recrystallization (D-R) method. Fe@Sn-h-HT catalyst possessed a hierarchical porous structure and a well-dispersed Fe2O3 particles with a size of 3.4 nm. Additionally, characterization methods such as XRD, HAADF-STEM, and H-2-TPR confirmed the transformation of skeleton Fe in Fe@Sn-h into uniformly dispersed Fe2O3 in Fe@Sn-h-HT catalyst. The higher selectivity and yield of C-2-C-4(=) compared to reference catalysts Fe/S and Fe@Sn-h provided strong evidence for the confined catalysis of the metal@zeolite catalyst.