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The Experimental Study of Adsorption and Separation of Hydrogen Gas Using Metal-organic Frameworks

Hashemi, Mohammad Mahdi | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53259 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Karimi Sabet, Javad
  7. Abstract:
  8. Hydrogen gas is considered as a clean fuel and energy carrier that its storage for future uses is a challenging issue. One of the methods to store it, is adsorption on a group of adsorbents called metal-organic frameworks. In this research, one of these frameworks called ZIF-8, has been selected to study hydrogen storage capability. To evaluate the effect of having two metals, a mixture of two metals was used in the synthesis process. To characterize the structure of the synthesized adsorbents, X-ray powder diffraction (XRD),adsorption and desorption of nitrogen at temperature of 77 K, Field Emission Scanning Electron Microscopy (FESEM), energy-dispersive X-ray Spectroscopy (EDS) and Fourier-transform infrared spectroscopy tests were applied. To measure hydrogen adsorption by volumetric method at cryogenic temperature (77 K) and ambient temperature, a device was designed and based on weight, hydrogen adsorption was calculated. Then a CoZn-ZIF-8 sample with a 1.34 wt% hydrogen adsorption at cryogenic temperature and 1 bar pressure was used to evaluate the adsorption of deuterium and from the obtained adsorption isotherm of deuterium and hydrogen, an ideal separation factor 1.218 at 1 bar pressure was achieved. This close to one separation factor indicates the absence of quantum effects at 77 Kelvin, and the difference in the amount of isotope adsorption could be due to the difference in their chemical affinities with the metal centers
  9. Keywords:
  10. Hydrogen Storage ; Metal-Organic Framework ; Bimetal Framework ; Physical Adsorption ; Ideal Separation Factor ; Field Emission Scanning Electron Microscopy (FESEM)

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