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Preparation of a Monolithic Nanocatalyst Utilizing Carbon Nanotubes for HDS Process
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Rashidi, Alimorad (Supervisor)
Abstract
Monolithic nanocatalysts for naphta hydrodesulfurization process have been prepared and evaluated. Commercial cordierite monolith was used as a ceramic substrate. Initially, the monoliths were pretreated with nitric acid solution in order to increase specific surface area. After that, carbon nanotubes were grown through catalytic decomposition of methane over prepared monoliths. Finally, the CNT-coated monoliths were oxidized with ozone and an aqueous solution of H2O2. For the preparation of HDS Co-Mo nanocatalysts, the metal content of aqueous solution including cobalt nitrate, ammonium heptamolybdate were then impregnated onto the prepared supports. Next, samples of prepared supports and...
Development of a structured monolithic support with a CNT washcoat for the naphtha HDS process
, Article Journal of the Taiwan Institute of Chemical Engineers ; Vol. 45, issue. 3 , May , 2014 , p. 887-895 ; Kazemeini, M ; Rashidi, A. M ; Jozani, K. J ; Sharif University of Technology
2014
Abstract
An acid treatment of the cordierite monolith followed by coating of the CNT onto it by means of catalytic decomposition of methane was performed. The resulting material utilized as the support for the CoMo catalyst. The characterization outcomes showed that the CNTs were distributed uniformly on the surface of the monolith leading to a high BET surface area and relatively good adhered mesoporous layer of CNTs. Moreover, the catalytic activity of the resulting catalysts determined in an HDS reaction of naphtha. It was concluded that the activity of the CoMo catalyst over the CNT coated monolithic support (FACNT) was higher than that of the CoMo deposited onto the acid-treated monolith and...
Preparation and characterization of Co-Mo catalyst supported on CNT coated cordierite monoliths utilized for naphta HDS process
, Article Procedia Engineering ; 2012 ; Kazemeini, M ; Rashidi, A. M ; Jozani, Kh. J ; Sharif University of Technology
2012
Abstract
Cordierite monolith were prepared by acid treatment followed by coating of the CNT onto it through the catalytic chemical-vapor deposition. The resulting material was used as support for the HDS catalyst onto which deposited Co and Mo species. These materials were utilized in an HDS reaction in which naphtha was fed into a concurrent fixed-bed of stainless steel reactor with 1cm ID. The CNT-cordierite monolith was stable and effective as catalyst support possessing desirable specific surface area, suitable pore-size distribution, and good attachment of the CNTs onto the substrate. HDS monolithic catalysts with the same significance (i.e.; activity > 90%) as the powder catalysts were...
Preparation and characterization of Co-Mo catalyst supported on CNT coated cordierite monoliths utilized for naphta HDS process
, Article Procedia Engineering ; Volume 42 , 2012 , Pages 1484-1492 ; 18777058 (ISSN) ; Kazemeini, M ; Rashidi, A. M ; Jafari Jozani, Kh ; Sharif University of Technology
2012
Abstract
In the present study, an acid treatment of the cordierite monolith followed by coating of the CNT onto it by means of catalytic chemical-vapor deposition (CCVD) of methane over CoMo catalyst was performed. The resulting material utilized as the supports for the HDS catalyst onto which was deposited Co and Mo species. The as-prepared samples were characterized by the BET, XRD, FESEM and ICP-MS techniques. BET experiments showed that a significant increase in specific surface area and pore volume was observed, and a suitable pore size distribution was obtained after acid pretreatment. The FESEM images of CNT coated monolith showed that CNTs were distributed uniformly on the surface of monolith...