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Synthesis of a Nanocatalyst for Selective Hydrogenation of Acetylene in Presence of Ethylene
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Rashidi, Ali Morad (Supervisor)
Abstract
In this research a novel palladium nanocatalyst was synthesized over single-wall carbon nanotube (SWNT) support and then applied in the selective hydrogenation of acetylene in an ethylene rich-flow stream. This nanocatalyst displayed a very promising selectivity toward ethylene production upon rising of the temperature, as well as suppressing oligomer formation during acetylene hydrogenation. It was rationalized that the overwhelming governing mechanism for the acetylene hydrogenation over the 0.48 wt% Pd/SWNT was the hydrogen transfer. Furthermore, new operating conditions for selective hydrogenation of acetylene in ethylene rich-flow were introduced through which the selective...
Rheological Characterization of Nanocomposite Alloy of Polyethylene/ Polyethylene Vinyl Acetate and Nano Cla
, M.Sc. Thesis Sharif University of Technology ; Ramazani Saadatanadi, Ahmad (Supervisor)
Abstract
In this thesis, polyethylene vinyl acetate and polyethylene shrinkable nanocomposite films with different percentages of an organoclay such as 0, 1, 3, 5 and 7% have been prepared via two-steps solution method. Morphological and properties of these films, including permeability and mechanical and rheological properties were investigated. Also the effect of addition of cross linking agent (DCP) was studied. Various tests including XRD, SEM, tensile and rheological properties were studied. XRD tests showed that the distance between a layer of or ganoclay increased to 32 percent. This indicates that the polymer chains between the layers of organoclay could be better. SEM examination showed that...
A Theoretical Investigation of Adsorption Energy of a Simple Reaction of FTS by Density Functional Theory (DFT)
, M.Sc. Thesis Sharif University of Technology ; Gholami, MohammadReza (Supervisor) ; Alahyfard, MohammadReza (Co-Advisor)
Abstract
The advent and advancement of technology through the conversion of Gas-Synthesis (a mixture of CO and H) into liquid hydrocarbons, by Fischer- Tropsch synthesis (FTS) gives more promising future in this field. Metals such as cobalt, nickel, zinc and iron are used as catalysts for FTS. Studies have shown that the surface structure of metal catalyst has a great influence on the process, and leads to different products and transition states. Iron has been known the most used and the most cost-effective metal catalyst in FTS. Different surfaces of Iron have different catalytic roles. In our work, Fe(100) -that is the most stable after Fe(110) and is known as the most active iron’s surface in...