Abstract
The catalytic thermal decomposition of CH4 and C4H10 has been experimentally studied using concentrated solar radiation as the clean source of process heat. A small scale fluidized-bed solar reactor containing Ni/Al2O3 or Co/MgO catalyst particles in a flow of reactant gas, was directly irradiated at a high-flux solar furnace. Two valuable chemical commodities were produced: Catalytic filamentous carbon (CFC) and hydrogen-rich gas mixtures. Carbon deposition consisted of randomly interlaced filaments that grew as monolithic nanofibers and hollow nanotubes (of approximately 10 to 40nm diameter), each with the catalytic particle present at the growth tip. BET measurements and high resolution transmission electron micrographs (HRTEM) confirm that CFC with distinct morphology can be produced from the decomposition of hydrocarbons using direct solar radiation.
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