Abstract
This work deals with the effect of adding Na to bimetallic sol–gel derived alumina supported Co/Ni nanocatalysts in Fischer–Tropsch synthesis. The catalyst activity and selectivity changed with different levels of Na, and the catalyst with 2 % Na loading was selected as an optimal catalyst to compare with un-promoted Co/Ni/Al2O3 catalyst. Na reduced the methane selectivity by increasing the chain-growth probability (α-value) at 12 bar. The results of physico-chemical characterizations show that the Na promoter plays a significant role in the catalytic structure. Additionally, the kinetic behavior was considered in absence and presence of Na over CoNi/Al2O3 catalysts. We applied an enolic approach, which was developed based on the interaction between adsorption HCO and dissociated adsorption hydrogen, through the Langmuir–Hinshelwood–Hougen–Watson (LHHW) adsorption theory. Kinetic parameters, including the rate constant (k) and activation energy (E a) of the catalysts, were also determined. The results show that, by adding Na, the activation energy (E a) decreases and the reaction rate (–R CO) increases.
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The authors gratefully thanks from University of Sistan and Baluchestan (USB), and Bioenergy 2020+ GmbH for the financial supports.
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Nikparsa, P., Mirzaei, A.A. & Rauch, R. Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology. Catal Lett 146, 61–71 (2016). https://doi.org/10.1007/s10562-015-1620-6
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DOI: https://doi.org/10.1007/s10562-015-1620-6