Co-production of hydrogen and carbon nanotube-silica fiber composites from ethanol steam reforming over an Ni-silica fiber catalyst
Nickel supported on silica fiber (Ni-SF) catalysts was successfully synthesized by sol–gel-assisted electrospinning of SFs followed by the conventional impregnation of the Ni salt and calcining. Their activity for the co-production of hydrogen (H2) and carbon nanotube-silica fiber (CNT-SF) composites in the ethanol steam reforming (ESR) process was investigated. The effects of the ESR reaction temperature, steam-to-carbon ratio (S/C), space–time (W/F), and Ni loading level on the reaction activity as well as H2 production and CNT-SF characteristics of the Ni-SF catalyst were investigated. The Ni-SF catalyst was highly effective at the simultaneous production of H2 and CNT. The optimized condition of the ESR in terms of the ethanol conversion and H2 yield was achieved at 600 °C, an S/C ratio of 9, and W/F of 18 gcat h mol−1 with a maximum H2 yield of 55%, while the best quality and quantity of the CNT (36%) formed along with a H2 yield of 29% was obtained at an Ni loading of 30 wt%, S/C ratio of 1, and W/F of 9 gcat h mol−1. The novel CNT-SF composite obtained from ESR exhibited a relatively high surface area and easy accessibility, making it a promising catalyst support for various processes.
KeywordsNickel-based catalyst Steam reforming of ethanol Silica fiber Carbon nanotubes
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