Synthesis of hybrid porous Molybdenum sulfide monolith

  • Salama H. Almarzooqi

Student thesis: Master's Thesis

Abstract

Molybdenum sulfide (MoS) is not a new material to hit the literature; it has been used historically as a hydrodesulfurization (HDS) catalyst and lubricant. New applications for MoS vary from semiconductors, transistors and catalysts to produce hydrogen. Nevertheless, what is available in literature have not touched any example of continuous porous monolithic form of Molybdenum sulfide material. This project aimed to investigate a new synthesis method for fabrication of porous monolith (foam) made out from molybdenum sulfide. The produced foam was made using commercial MoS2 powder, a MoS 2 precursor, laponite and polymer solution. The porous foam has more than twice the surface area of commercial MoS2 (9.67 m2 /g for commercial MoS2 to an average of 27.9 m 2/g) with average pore diameter of 24.4 Ao and total pore volume of 0.032 cm3/g. MoS2 hybrid foam was characterized for surface structure and morphology using XRD and microscopy images. It was found that the interlayer spacing of the original stack of MoS2 sheets has not changed significantly while the images shows random depositions of small flakes which produces inhomogeneous surface. Raman and Fourier Transform Infrared (FTIR) spectra gave peaks that support the presence of MoS2 even after calcination of the foam at a temperature of 950 °C. The Thermal Gravimetric Analyzer (TGA) gave a total mass loss of 38.8% of foam film precursor when tested at similar conditions to the calcination process of dry film precursor to produce porous foam. Furthermore, liquid adsorption of Dibenzothiophene (DBT) in toluene solvent was used to test the foam affinity to adsorb organosulfur model compound (DBT). Brief comparison with examples of different porous materials tested for liquid adsorption show that the synthesized hybrid MoS2 foam gives the highest capacity per surface area. This project succeeds in producing a continuous hybrid MoS2 monolith. Future development to be built on this work would include structure enhancement and stability of the monolith, additional catalytic activity measurements and further testing of suitable applications to fits the new monolith (foam) material.
Date of Award2014
Original languageAmerican English
SupervisorSaeed Al Hassan (Supervisor)

Keywords

  • Pure sciences
  • Applied sciences
  • Analytical chemistry
  • Inorganic chemistry
  • Organic chemistry
  • Chemical engineering
  • 0486:Analytical chemistry
  • 0542:Chemical engineering
  • 0488:Inorganic chemistry
  • 0490:Organic chemistry

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