Abstract
In this work, cobalt Fischer–Tropsch synthesis (FTS) catalyst supported on various carbon materials, i.e., carbon nanotube (CNT), activated carbon (AC), graphene oxide (GO), reduced graphene oxide (rGO), and carbon nanofiber (CNF), were prepared via impregnation method. Based on TGA, nitrogen physisorption, XRD, Raman spectroscopy, H2-TPR, NH3-TPD, ICP, SEM, and TEM characterization, it is confirmed that Co3O4 particles are dispersed uniformly on the supports of carbon nanotube, activated carbon and carbon nanofiber. Furthermore, the FT catalyst performance for as-prepared catalysts was evaluated in a fixed-bed reactor under the condition of H2:CO = 2:1, 5 SL·h−1·g−1, 2.5 MPa, and 210 °C. Interestingly, the defined three types of carbon materials exhibit superior performance and dispersion compared with graphene oxide and reduced graphene oxide. The thermal stability and pore structure of the five carbon materials vary markedly, and H2-TPR result shows that the metal–support interaction is in the order of Co/GO > Co/CNT > Co/AC > Co/CNF > Co/rGO. In brief, the carbon nanofiber-supported cobalt catalyst showed the best dispersion, the highest CO conversion, and the lowest gas product but the highest heavy hydrocarbons (C5+) selectivity, which can be attributed to the intrinsic property of CNF material that can affect the catalytic performance in a complicated way. This work will open up a new gateway for cobalt support catalysts on various carbon-based materials for Fischer–Tropsch Synthesis.
Highlights
As a nonrenewable natural resource, petroleum reserve is declining rapidly and it is of great significance to explore an alternative energy utilization pathway [1]
The physical and reaction properties of the cobalt Fischer–Tropsch synthesis (FTS) catalysts supported on various carbon materials, i.e., carbon nanotube (CNT), activated carbon (AC), graphene oxide (GO), reduced graphene oxide, and carbon nanofiber (CNF), were reported and discussed
The various carbon materials including CNT, AC, GO, reduced graphene oxide (rGO), and CNF, and the cobalt catalysts supported on these carbon materials were characterized by DTA, nitrogen physisorption, X-ray diffraction (XRD), Raman spectroscopy, H2 -Temperature programmed reduction (TPR), NH3 -Temperature programmed desorption (TPD), inductively coupled plasma (ICP), scanning electron microscope (SEM), and transmission electron microscope (TEM)
Summary
As a nonrenewable natural resource, petroleum reserve is declining rapidly and it is of great significance to explore an alternative energy utilization pathway [1]. Compared with iron-based Fischer–Tropsch catalyst, cobalt-based catalyst exhibits good catalytic activity, higher C5+ selectivity and lower water gas shift (WGS) reaction activity. These properties play an important role in the Fischer–Tropsch synthesis application [4]. Ahmad Tavasoli et al [9] studied the carbon-nanotube-supported cobalt catalyst, and explored the influencing factors on catalytic activity, product selectivity, and lifetime. Bezemer et al [13] prepared the carbon-nanofiber-supported cobalt-based Fischer–Tropsch synthesis catalyst, and they confirmed that cobalt crystallite size can affect the catalytic activity markedly. For comparison, different carbon materials, including carbon nanotube, activated carbon, graphene oxide, reduced graphene oxide, and carbon nanofiber, were used to prepare a number of cobalt-based Fischer–Tropsch synthesis catalysts. This study is important to expand the application of carbon materials in the FTS field
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