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Preparation of Nano Adsorbent from Cellulose-based Material for Gas Storage

Heidari, Sara | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44123 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Rashidi, Alimorad
  7. Abstract:
  8. Natural gas (NG) has emerged as an alternative energy source in transportation sector as it provides clean combustion and hence lowers exhaust pollution. NG can be stored as an adsorbed phase in porous materials and is referred to ANG. The use of adsorbent materials for storing NG, at relatively low pressure (3.5–4 MPa), is a possibility for making ANG technology competitive with CNG. Among all adsorbents, carbon nanostructures with pore diameter (0.8-1.4 nm) has shown the highest adsorption capacity of natural gas. In the present study, cellulose has been used as the carbonaceous precursor and Activated Carbon (AC) has been prepared using hydrothermal carbonization of cellulose followed by phosphoric acid activation. response surface methodology (RSM) was used to optimize the operating parameters of the production process. Temperature, chemical impregnation ratio, heating rate and time were chosen as the main process variables and the amount of methane adsorption was selected as the investigated response. The optimum methane adsorption were found to be 7.415 mmol/g and the amount of methane uptake increased after reactivation with potassium hydroxide. In addition, AC with maximum methane uptake of 12.03 mmol/g has also been prepared using hydrothermal treatment followed by activation with potassium hydroxide. To generalize this process to lignocellulosic material, (AC) has been prepared using hydrothermal carbonization of walnut shell followed by phosphoric acid activation. The methane adsorption results exhibited significant increase with hydrothermal pretreatment
  9. Keywords:
  10. Adsorbed Natural Gas (ANG) ; Nano-Carbon Adsorbent ; Cellulose ; Hydrothermal Carbonization ; Chemical Activation ; Activated Carbon ; Lignocellulosic Fibers

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