(560el) Effect of Promoter Loading on Iron Supported Fischer-Tropsch Synthesis Catalyst at High-Temperature | AIChE

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(560el) Effect of Promoter Loading on Iron Supported Fischer-Tropsch Synthesis Catalyst at High-Temperature

Authors 

Chang, Y. - Presenter, UNIVERSITY OF SOUTH FLORIDA
Kuhn, J. N., University of South Florida
Joseph, B., University of South Florida
Seby, S., University of south florida
Weber, D., University of South Florida
Effect of Promoter Loading on Iron Supported Fischer-Tropsch Synthesis at High-Temperatures

Yajing Chang*, Sreya Mariya Seby, David Weber, Babu Joseph, John N. Kuhn

Department of Chemical & Biomedical Engineering, University of South Florida

*Presenting author. Tel: +1 727-488-4670; E-mail address: yajingchang@mail.usf.edu

ABSTRACT

To create an intensified process which combines reforming and FTS reactions, a high-temperature FTS catalyst is needed [1]. Based on prior research, iron (Fe) based catalysts have wide temperature adaptability (230-350℃). Selection of the support can also impact the performance of iron-based FTS catalysts. Also, various promoters have been used to improve the catalyst performance.

In this work, the effects of promoters on Fe based catalysts were investigated at high temperatures and low pressures. The catalysts were prepared by incipient wetness impregnation with 10-15 weight % of Iron. The catalysts were characterized using XRD, TPR, N2 Physisorption, and SEM. The Fe/Al2O3, Fe/SiC, and Fe/SiO2 were activated at 350 ℃ with hydrogen and FTS reaction was conducted at 290℃with syngas having 1:2 CO:H2 ratio. Fe/SBA-15 was activated at 430℃ with syngas and then tested for FTS reaction at the same temperature with syngas. To improve the selectivity and conversion, copper, potassium, and manganese have been investigated as promoters for the Fe-SBA15. Catalysts with manganese promoter showed a decrease in carbon dioxide selectivity from 76% to 50%, an increase in C2-C4 selectivity from 9.6% to 30% and an increase in C5+ selectivity from 0.2% to 2.2%. The catalysts with potassium promoter showed a negative effect on CO conversion. Copper promoter increase the selectivity of the carbon dioxide. Currently, we are evaluating the effect of the different amount of Mn loading on Fe with various supports.



[1] M. Johns, P. Collier, M.S. Spencer, T. Alderson, G.J. Hutchings, Combined steam reforming of methane and Fischer-Tropsch synthesis for the formation of hydrocarbons: A proof of concept study, Catalysis Letters 90(3-4) (2003) 187-194.

[2] Zhang J, Abbas M, Chen J. The evolution of Fe phases of a fused iron catalyst during reduction and Fischer–Tropsch synthesis. Catalysis Science & Technology. 2017;7(16):3626.

Topics 

Catalysis
Energy

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