Effect of Support on the Performance of CoMoRe Catalyst in Thiophene and Benzothiophene Hydrodesulfurization

Abstract

This work is aimed at selection of a suitable support for CoMoRe catalyst in hydrodesulfurization (HDS) of thiophenes. g-Al2O3 and g-Al2O3-HMS were used as a support for CoMoRe catalyst with 4%Co, 8%Mo and 0.5%Re loading. The metal loading was incorporated by using the pore volume impregnation method, employing aqueous solutions of cobalt (II) nitrate, ammonium molibdate and rhenium (VII) oxide. The catalysts were sulfided with dimethyl disulphide at 250 �C for 10 h and finally tested in the HDS reaction of thiophene and benzothiophene in different temperature and pressure conditions. The catalysts were characterized by determining the adsorption isotherms, the pore size distribution and the acid strengt, FTIR, XRD and S EM. T he catalyst supported on g - Al2O3 displayed higher activity than catalyst supported on g-Al2O3-HMS. The results suggest that activity is favoured by the suitable textural and acidic properties of the support.

Hydrodesulfurization of Dibenzothiophene on a CoNiMo Catalyst

“…The CoNiMo/γ-Al 2 O 3 catalyst was prepared by the incipient wetness co-impregnation using ammonium molybdate tetrahydrate, cobalt (II) nitrate hexahydrate (Sigma-Aldrich) and nickel (II) nitrate hexahydrate respectively [19]. After each impregnation step, the catalyst was dried for 24 h and calcined for 4 h at 450 °C, with the exception of the final calcination that last 6 h.…”

Application of Hydrothermal and Solvothermal Method in Synthesis of MoS2

“…Structures with many hundred nanometre is 2H-MoS2 [9], but 2H-MoS2 can be converted into 1T-MoS2 which is driven by the transition metal Mo vacancy [10]. Nowadays, MoS2 nanomaterials were extensively used in various field such as super dye sensitized solar cell [11], super-capacitor [12,13], hydrogen evolution reaction [14,15], lithium electronic [16,17], sensors [18,19], catalysis [20].…”

Hydroconversion of Residual Fatty Acids on a Molybdenum-Copper Catalyst

“…The main problem for developing green diesel technologies is the limited number of non-food triglyceride sources of fatty acids [8].Hydrotreatment reactions are extremely exothermic, their control being extremely important. These reactions have been usually applied to remove heteroatoms such as sulfur, oxygen and nitrogen from various oil fractions and occur in the presence of metal and acid catalytic centers [9][10][11][12]. Impurities from animal oils or fats, high reaction temperature, insufficient control of the reaction temperature or too little hydrogen in the reactor can lead to unwanted side reactions, such as cracking, polymerization, ketonization, cyclization and aromatization and deposition of coke on the catalyst.Hydroconversion results from several competing reactions, such as decarboxylation [13], decarbonylation [14-16] and hydrodeoxygenation [17].Snare et al [18] used oleic acid, linoleic acid and methyl oleate as model compounds in vegetable oil, for hydroconversion on a semi-continuous reactor, using a 5% Pd / C catalyst, resulting in high selectivity and high yields in hydrocarbons.…”

“…Hydrotreatment reactions are extremely exothermic, their control being extremely important. These reactions have been usually applied to remove heteroatoms such as sulfur, oxygen and nitrogen from various oil fractions and occur in the presence of metal and acid catalytic centers [9][10][11][12]. Impurities from animal oils or fats, high reaction temperature, insufficient control of the reaction temperature or too little hydrogen in the reactor can lead to unwanted side reactions, such as cracking, polymerization, ketonization, cyclization and aromatization and deposition of coke on the catalyst.…”