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Synthesis and Experimental Study of Nano-Carbon Adsorbent for Natural Gas Storage

Roohollahi, Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41626 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad; Rashidi, Ali Morad
  7. Abstract:
  8. The major obstacle in using natural gas as a clean and abundant fuel in transportation industries is the low density of energy obtained from its combustion. Adsorbed Natural Gas (ANG) is a useful method to increase the energy density and store the natural gas. The lower cost and higher safety have made it different from the other storage technologies. In addition, ANG can be useful to solve the lack of gas in the peak of consumption. Among all adsorbents, Activated Carbon (AC) has shown the highest adsorption capacity of natural gas. In the present project, walnut shell has been used as the precursor in the chemical synthesise of AC. The main effective factors in chemical activation, such as the activation ratio, activation temperature and the particle size of precursor, have been investigated. Moreover, the growth of carbon nanostructures on the AC surface has been done. The methane adsorption capacity of each sample has been tested and the structural characteristics have been recorded by BET or SEM test. In comparison with the KOH activation, the samples which have been synthesized with H3PO4 have shown higher BET surface area and micropore volume and so the higher storage capacity. Among the synthesized ACs, two samples (H3PO4, 1.7-450-10/20 and K-Hybrid, CNF-CO2) had the most adsorption capacities (67 and 66 VSTP/V respectfully). In addition, by the growth of carbon nanofiber on the AC activated with KOH (+ CO2 activation), the methane storage capacity of the primary sample was increased about 30 percent.
  9. Keywords:
  10. Adsorbed Natural Gas (ANG) ; Natural Gas Storage ; Adsorption ; Activated Carbon ; Nano-Carbon Adsorbent

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