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Many different types of double bond can react with hydrogen gas in the presence of a catalyst.

Catalysts used are Ni Pd Pt Ru Rh Co

Hydrogenation reactions occur in the stages shown here for the hydrogenation of ethene on nickel.

 

Hydrogenation

 

 

 

Question

If the product bonded strongly to the catalyst what would happen?

 
The catalyst and the support employed depend on the particular hydrogenation reaction being carried out. You are probably making daily use of products of hydrogenation reactions.
For example it is a hydrogenation reaction which transforms vegetable oils into margarine,

 

There are several stages involved in taking a process like hydrogenation from the laboratory, where feasible reactions are identified, to full scale production. For more details on how this is achieved, click here.

 

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