A Newly Designed Core-Shell-Like Zeolite Capsule Catalyst for Synthesis of Light Olefins from Syngas via Fischer-Tropsch Synthesis Reaction

Improving the selectivity of light olefins remains a longstanding challenge in Fischer-Tropsch to light olefins reaction (FTO). Toward this objective, we designed and prepared a newly catalyst with core-shell-like structure by using a simple and facile method named physically adhesive method. This core-shell-like catalyst Fe@SAPO-34 was characterized by XRD, SEM, EDS, N-2 sorption and NH3-TPD respectively. The characterization results indicated that the SAPO-34 zeolite shell was comparatively uniform, homogeneous and defect-free, and it encapsulated the Fe catalyst entirely. Fischer-Tropsch synthesis reaction of syngas to light olefins was selected to test the catalytic performance of the zeolite capsule catalyst. In comparison with the simple mixture catalyst Fe/SAPO-34 and bare Fe catalyst, the newly Fe@SAPO-34 catalyst has demonstrated ability of the highest selectivity of light olefins 52.6% and O/P ratio 6.4. The SAPO-34 zeolite shell acted an important role for the improvement of light olefins selectivity. [GRAPHICS] .