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Transesterification of canola oil to biodiesel using CaO/Talc nanopowder as a mixed oxide catalyst
, Article Chemical Engineering and Technology ; Volume 40, Issue 10 , 2017 , Pages 1923-1930 ; 09307516 (ISSN) ; Kazemeini, M ; Bastan, F ; Sharif University of Technology
Abstract
A series of heterogeneous catalysts including different molar ratios of CaO/talc was synthesized to study the transesterification reaction of canola oil and methanol under different reaction conditions. Characterization and kinetic results revealed that the activity of this catalyst was enhanced due to the increase of CaO/talc molar ratio value leading to an improvement in the biodiesel production. Moreover, the effect of various parameters on the activity of the undertaken catalysts was studied in order to determine the optimum process conditions. Leaching measurements and the durability of the CaO/talc catalyst under several reaction cycles were evaluated and proved it to be a stable...
Toughening mechanisms of SiC-bonded CNT bulk nanocomposites prepared by spark plasma sintering
, Article International Journal of Refractory Metals and Hard Materials ; Volume 71 , February , 2018 , Pages 61-69 ; 02634368 (ISSN) ; Azarniya, A ; Eslami Shahed, H ; Madaah Hosseini, H. R ; Simchi, A ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
In this work, silicon carbide (SiC) was utilized as a binding agent to fuse carbon nanotubes (CNTs) into highly tough dense CNT bulk nanocomposites through spark plasma sintering (SPS) method. Phase studies were performed using x-ray diffraction analysis (XRD) and field-emission scanning electron microscopy (FESEM) and obtained results were verified by the microstructural evolution. Also, the optimum processing temperature was determined as 1600 °C at which the undesired allotropic phase transformation of SiC (β) → SiC (α) was avoided and single-walled CNTs (SWCNTs) were structurally preserved. Fracture toughness of the nanocomposite synthesized at optimum processing conditions was...