
Hydrodesulfurization (HDS) is a catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products such as gasoline or petrol, jet fuel, kerosene, diesel fuel, and fuel oils.
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http://en.wikipedia.org/wiki/Glossary_of_fuel_cell_terms

Hydrodesulfurization (HDS) is a catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products such as gasoline or petrol, jet fuel, kerosene, diesel fuel, and fuel oils. The purpose of removing the sulfur is to reduce the sulfur dioxide ({chem|SO|2}) emissions that result from using those fuels in...
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http://en.wikipedia.org/wiki/Hydrodesulfurization

desulfurization by catalytic agents of the sulfur-rich hydrocarbons obtained from petroleum or the like during cracking or hydrocracking.
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https://www.infoplease.com/dictionary/hydrodesulfurization
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