Environmental Science AP, 1st Pd.
04 September 2013
What is hydrodesulfurization or HDS? Stating its definition, hydroheating is to remove sulfur. Still don’t understand well let me break it down for you. Hydrodesulfurization is a catalytic chemical process widely used to remove sulfur compounds from refined petroleum products such as gasoline or petrol, jet fuel, kerosene, diesel fuel and fuel oils. It’s important because removing the sulfur is to reduce the sulfur dioxide emission resulting from using those fuels in automotive vehicle, aircraft, railroad locomotives, ships or oil burning power plants, residential and industrial furnaces and other forms of fuel combustion. Another example why hydrodesulfurization is important is because removing sulfur from the intermediate product naphtha streams within a petroleum refinery is that sulfur, even in extremely low concentrations, poisons the noble metal catalysts platinum and rhenium in the catalytic reforming units that are subsequently used to upgrade the of the naphtha streams . Most metals in catalysis HDS is those at the middle of the transition metal series that are most active. Ruthenium disulfide appears to be the single most active catalyst, but binary combinations of cobalt and molybdenum are also highly active. Aside from the basic cobalt-modified catalyst, nickel and tungsten are also used, depending on the nature of the feed. For example, Ni-W catalysts are more effective for hydrodenitrogenation. Hydrodesulfurization is used in many things for example, in food the unsaturated fatty acids in liquid vegetable fats and oils This process was invented in the early 1900s by two men. A French chemist named Paul Sabatier discovered the property of finely divided nickel to catalyze the fixation of hydrogen on hydrocarbon (ethylene, benzene) double bonds and a German chemist, Wilhelm Norman found that catalytic hydrogenation could be used to convert unsaturated fatty acids or glycerides...
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