Abstract
The Fe-Co-Ce nanocatalyst was synthesized by a solvothermal method and used in Fischer-Tropsch synthesis. This paper represents a statistical analysis to illustrate the effects of oleylamine concentration and operating variables (temperature, pressure, inlet H2/CO molar ratio) on light olefin (C2=-C4=), paraffin (C1 + C2-C4) selectivity and CO conversion (catalyst activity) in a fixed bed micro reactor was done. In order to evaluate variable effects, analysis of variance (ANOVA) was applied for modeling and optimization of goal products using response surface methodology (RSM). The result showed that by increasing both amine concentration and pressure at lower temperature and inlet H2/CO molar ratio, olefin selectivity and CO conversion rises, while paraffin selectivity reduces. Comparison of optimization results to maximum olefin selectivity and CO conversion and minimum paraffin selectivity for predicted and experimental data indicate a desirable agreement.
Highlights
In the near future the feedstock of chemical industry will shift from crude oil to natural gas because of the limited reserves of crude oil and increasing environmental constraints
The results indicate that by increasing in oleylamine concentration, both olefin selectivity and CO conversion increase, while paraffin selectivity decreases
Ternary Fe-Co-Ce nanocatalyst solvothermally synthesized and the effect of parameters on performance of nanocatalyst evaluated in detail
Summary
In the near future the feedstock of chemical industry will shift from crude oil to natural gas because of the limited reserves of crude oil and increasing environmental constraints. Fischer-Tropsch synthesis is a promising process, is known as an exothermic polymerization reaction, which converts CO and H2 into water and linear hydrocarbons (chemical liquefaction of natural gas) [1, 2]. The main active industrially metals for Fischer-Tropsch catalysts are based on iron and cobalt. The price for iron-based catalysts is low, but these catalysts suffer from a low wax selectivity, deactivation and inhibition of productivity by water at high syngas conversions. Cobalt-based catalysts are stable, promoting formation of heavy wax and permit high syngas conversions [3, 4]. Rare earth oxides have been extensively illustrated as both structural and electronic promoters to boost catalyst features. CeO2 is the most prominent metal oxide in industrial catalysis process. Solid catalysts are highly complicated products derived from chemicals by various procedures
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