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Conversion of Methane into Heaviour Hydrocarbons by Nanoparticles -assisted Nanosecond Laser Induced Plasma

Jahed Samarin, Anahita | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49969 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. In this thesis, conversion of methane into heavier hydrocarbons was performed by nanoparticles-assisted nanosecond laser induced plasma. Nickel oxide nanoparticles was synthesized by sol-gel procedure and packed into a compact tablet after drying and used as a target in a two BK7 windows-camber with pressure of 1500 mbar. Methane was introduced to the chamber and two different nanosecond lasers namely, Nd:YAG (λ=1064 and 532 nm) and KrF (λ=248 nm) were radiated. Interaction of the gas with the plasma produced by metal nanoparticles and the thermionic emissions due to the inverse bremsstrahlung caused conversion of methane to the heavier hydrocarbons. These conversions can also promote by catalytic effect of nickel oxide nanoparticles. Gas chromatography was used for identification and determination of mixture composition. The main factors affecting the conversion percentage and hydrocarbon type including laser energy, wavelengths and number of shots were investigated. The results reveal that KrF laser has higher conversion ratio of 96.24% with respect to the both Nd:YAG wavelengths. However, second harmonic of Nd:YAG has more product variety. Propane was the most frequent hydrocarbon produced with 84.73% of conversion. According to the results, the proposed method has higher conversion efficiency and composition variety and produces more heavier hydrocarbons with respect to the previously reported methods which is much valuable for both environmental protections and industrial applications
  9. Keywords:
  10. Methane Conversion ; Gas Chromatography ; Pulse Laser ; Higher Hydrocarbures ; Laser-Plasma Interaction ; Higher Hydrocarbures ; Nickel Oxide Nanoparticles

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