Hydrodesulphurization of Thiophenes over CoMoRe/ ZSM 5gama-Al2O3 Catalyst

Abstract

The hydrodesulphurization (HDS) of thiophenes was performed on metallic catalyst CoMoRe/ZSM5-gAl2O3. Experiments were carried out on a fixed bed catalytic reactor at 175-300�C, 30-60 atm, thiophene volume hourly space velocities of 1h-1- 4h-1 and molar ratio hydrogen/thiophene of 60/1. Texture features like specific surface area, the pore volume and the average pore diameter decrease after catalyst sulfurization. The thiophenes conversion on CoMoRe/gAl2O3-Zn-HZSM 5 catalyst differs with the nature of the studied thiophenes.

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.…”

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

“…Sulfur bonded to various organic species present in fuels is thus converted to H 2 S, which is eliminated and then converted to elemental sulfur through the Claus process. The concern for improving the performance of hydrodesulfurization catalysts is found in the large number of published papers that address this process [1][2][3][4][5][6][7].…”