Hydrogenation of alkenes in the presence of a Hydrogen and palladium catalyst produces

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03-06-2021
Science

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Hydrogenation of alkenes in the presence of a Hydrogen and palladium catalyst produces

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Answer:

Hydrogenation is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds. Hydrogenation typically constitutes the addition of pairs of hydrogen atoms to a molecule, often an alkene. Catalysts are required for the reaction to be usable; non-catalytic hydrogenation takes place only at very high temperatures. Hydrogenation reduces double and triple bonds in hydrocarbons.[1]

Steps in the hydrogenation of a C=C double bond at a catalyst surface, for example Ni or Pt :

(1) The reactants are adsorbed on the catalyst surface and H2 dissociates.

(2) An H atom bonds to one C atom. The other C atom is still attached to the surface.

(3) A second C atom bonds to an H atom. The molecule leaves the surface.

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