Synthesis, Characterization, and Hydrodesulfurization Activity of New Mesoporous Carbon Supported Transition Metal Sulfide Catalysts

Abstract

The potential of sulfided Mo, Co, and CoMo catalysts supported on two different carbon mesostructures by KAIST-1 and 3 (CMK-1 and 3) for hydrodesulphurization (HDS) of thiophene at specific conditions was explored to investigate the effect of different pore sizes, surface functional groups, metal dispersion, and presulfidation temperature. Co/CMK catalysts were superior to Mo/CMK catalysts on the basis of same metal loading. The synergistic effect was found at Co/Mo ratio of 5/5. Sulfidation on carbon supported catalysts was favored at lower temperature of 300 °C, whereas higher temperature of 400 and 500 °C showed a more favorable effect on alumina supported catalysts. CMK-3 supported CoMo catalysts were superior to all other catalysts due to larger pore size and higher acidic surface functional groups. CMK-3 oxidized with nitric acid showed even better performance for CoMo (5:5) supported catalysts since the increased surface functional groups might induce better dispersion leading to higher HDS activity.

How the adsorption properties get changed when going from SBA-15 to its CMK-3 carbon replica

“…An extended study, on the surface chemistry of OMC by Darmstadt et al [53] also indicate towards the presence of acidic sites like -COOH, on carbon surface. Further, Hussain and Ihm [54] also confirmed by acid-base titrations that its surface contains several acidic functional groups, like carboxylic, lactonic, and phenolic groups. Apparently, the adsorption process is mainly governed by either acidity of surface or by newly added microporosity in the material.…”

Synthesis and characterization of MCM-41-supported nano zirconia catalysts

“…1. The pure MCM-41 exhibits strong peaks at 2<theta> = 2.1°due to (1 0 0) reflection lines, three weak signals at 2<theta> = 3.56, 4.08 and 5.4°that correspond to (1 1 0), (2 0 0), and (2 1 0) reflections, indicating the formation of well-ordered hexagonal mesoporous material with space group p6mm [13][14][15]. The X-RD patterns of SZr-MCM41(A-C) also showed typical diffraction peaks at 2<theta> = 2.2, 3.8 and 4.4°, which are slightly higher than the 2<theta> value of pure siliceous MCM-41.…”

Effect of interactions between Ni and Mo on catalytic properties of a bimetallic Ni-Mo/Al 2 O 3 propane reforming catalyst

“…Mo-Ni catalysts have been extensively studied in the literature as active and stable hydrodesulphurization catalysts [20,21]. In these catalyst formulations, the Mo loading is greater Page 5 of 53 A c c e p t e d M a n u s c r i p t than that of Ni, since Mo is the primary desulphurization metal, while Ni is added as a promoter.…”