Loading...

Capturing Co2 of the Atmosphere by Molten Carbonates and Transforming to Carbon Nanofiber

Zarei, Mohammad Mahdi | 2019

768 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52492 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Nouri Borujerdi, Ali
  7. Abstract:
  8. Capturing the atmospheric CO2 and turning it into value added products is a topic that has been extensively studied in recent years. One of the methods through which CO2 is valorized is via converting it into carbon nanofiber, CNFs. CNFs can be an important material in future human activities due to its valuable properties such as wide range of electrical conductivity, their superior flexibility and strength, But it is currently obstructed in use due to the high cost of manufacturing and the complexity of the synthesis. Furthermore, in today's world, human life is heavily influenced by greenhouse gases, and avoiding emitting gases like CO2, is almost infeasible. This thesis provides an effective solution for converting atmospheric CO2 into CNF via molten carbonates. The electrochemical reduction of CO2 have been conducted by lithium carbonate electrolyte, the molten point of which is 723 degrees Celsius. The energy required for this method, which is carried out via electrolysis between the galvanized steel cathode and nickel anode, can be supplied on a large scale by solar energy. This reaction is controlled by metals such as nickel as the nucleation sites for CNF deposition, zinc as the initiator, as well as factors like current density. It is expected at the end of the process CNF will be deposited at the cathode. The most important challenge in this project is to find a suitable method for melting lithium carbonate. Different methods have been examined, and the furnace was the best method to do so. Then, by adding sodium carbonate and lithium metaborate to lithium carbonate, we were able to Synthesize tangled CNF and CNF with high electrical conductivity, respectively. The product is washed with HCl to absorb solidified lithium carbonate on the product, and separated from washing solution by centrifugation. To analyze the morphology of the product XRD, SEM and Raman Spectra analysis were conducted. Via this technique not only can we play a significant role in mitigating greenhouse gases but we also can synthesize CNFs with much less cost and complexity
  9. Keywords:
  10. Carbon Dioxide ; Electrolysis ; X Ray Diffraction ; Carbon Nanofiber ; Molten Carbonate Fuel Cell ; Electrochemical Reduction ; Scanning Electron Microscopy (SEM)

 Digital Object List

 Bookmark

No TOC