Abstract:

Direct conversion of syngas into hydrocarbons with high selectivity remains a challenge. Herein, we report the synthesis of a core-shell-structured catalyst constituting Cr-Zn oxide as the core and SAPO-34 as the shell for the conversion of syngas into hydrocarbons with high selectivity. A SiO₂ layer was sandwiched between the core and the shell to prevent damage to the core during shell synthesis. Furthermore, the intermediate SiO₂ layer acted as a Si source for the formation of the shell. The prepared catalyst displayed considerably higher selectivity toward the production of C₂-C₄ hydrocarbons (66.9%) than that of methanol and methane. The findings show the potential of the prepared core-shell-structured catalyst in the one-step production of hydrocarbons, such as liquefied petroleum gas, from syngas. However, further optimization of the catalyst is necessary to achieve higher performance.

Key words: Chromium-zinc oxide, Zeolite, Core-shell, C₂-C₄ hydrocarbons, Syngas direct conversion