different between hydrogenation vs hydrodesulfurization

English

hydrogen +? -ation

hydrogenation (countable and uncountable, plural hydrogenations)

(chemistry) The chemical reaction of hydrogen with another substance, especially with an unsaturated organic compound, and usually under the influence of temperature, pressure and catalysts.

hydro- +? desulfurization

hydrodesulfurization (uncountable)

(chemistry) a process for lowering the sulfur content of petroleum and similar products by catalytic hydrogenation, sulfur compounds being converted to hydrogen sulfide

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