Abstract
Iron oxide nanoparticles were prepared by microemulsion method and evaluated in Fischer-Tropsch synthesis. The precipitation process was performed in a single-phase microemulsion operating region. Different HLB values of surfactant were prepared by mixing of sodium dodecyl sulfate (SDS) and Triton X-100. Transmission electron microscopy (TEM), surface area, pore volume, average pore diameter, pore size distribution, and XRD patterns were used to analyze size distribution, shape, and structure of precipitated hematite nanoparticles. Furthermore, temperature programmed reduction (TPR) and catalytic activity in CO hydrogenation were implemented to assess the performance of the samples. It was found that methane and CO2selectivity and also the syngas conversion increased as the HLB value of surfactant decreased. In addition, the selectivity to heavy hydrocarbons and chain growth probability (α) decreased by decreasing the catalyst crystal size.
Highlights
Nanoscale materials exhibited novel properties including quantum size effect on photochemistry, nonlinear optical properties of semiconductor and new catalytic properties of metallic nanoparticles [1]
Nanostructure iron catalysts were characterized by X-ray diffraction (XRD) measurement after calcinations (Figure 1)
It was found that the CO and H2 conversion was increased while the Hydrophiliclipophilic balance (HLB) value of surfactant decreased
Summary
Nanoscale materials exhibited novel properties including quantum size effect on photochemistry, nonlinear optical properties of semiconductor and new catalytic properties of metallic nanoparticles [1]. Hydrophiliclipophilic balance (HLB) is an important concept which relates the molecular structure to the interfacial packing and film curvature. It is generally expressed as an empirical equation based on the relative proportions of hydrophobic and hydrophilic groups within the molecule. Murzin reported that FTS reactions on the supported cobalt based catalysts show many sensitivities to the catalyst particle size [13, 14]. We tried to show structure sensitivity of unsupported iron catalysts [10, 11, 17] In this the present work, feasibility of iron nanoparticle formation in the microemulsion systems with different HLB values was investigated. Catalyst characterization and catalytic FTS reaction are examined at different particle sizes
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