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Sintered precipitated iron catalysts with enhanced fragmentation-resistance ability for Fischer – Tropsch synthesis to lower olefins

Abstract

The commercial precipitated iron catalyst suffers from severe fragmentation when applied in Fischer Tropsch to lower olefins reaction (FTO). Herein, sintered precipitated iron catalysts for FTO are prepared by varying calcination temperatures from 800 to 1400°C to enhance the fragmentation-resistance ability. Compared with traditional precipitated iron catalysts, sintered precipitated iron catalysts require higher reduction temperatures to maintain high and stable activity, and shift the production of hydrocarbons towards lower olefins. Spent sintered precipitated iron catalysts show bulk morphologies with less fragmentation than the fragmented and aggregated morphologies of spent traditional precipitated iron catalysts. The amount of coke inside spent catalysts decreases from 41.8 to 12.5% as the calcination temperature increases from 500 to 1200°C, and simultaneously, the chain length of soluble coke decreases from C32 to C21. The less amount of coke and shorter chain length of soluble coke of sintered precipitated iron catalysts come from the stronger mechanical strength induced less space for coke accumulation during FTO, which further enhance the fragmentation-resistance ability of catalysts.

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Publication details

The article was received on 04 Jul 2018, accepted on 09 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01392F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Sintered precipitated iron catalysts with enhanced fragmentation-resistance ability for Fischer – Tropsch synthesis to lower olefins

    Y. Chen, Y. Ni, Y. Liu, H. Liu, X. Ma, S. Liu, W. Zhu and Z. Liu, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01392F

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