Reduction of a ketone to an alkane
The reduction of a ketone all the way down to an alkane using catalytic hydrogenation over palladium on charcoal is not a general/widely used process. 

Quoting from Comprehensive Organic Functional Group Transformations III: 


  ...while the reduction of benzylic ketones by hydrogenation over palladium is often an efficient procedure , it ... sees limited use. An isolated report of the reduction of aliphatic ketones by hydrogenation over platinum on Montmorillonite K-10 merits ...attention here and further study


The majority of examples of this reaction occur using benzylic ketones, carrying out the reaction in the presence of aqueous acid in order to facilitate the loss of the hydroxyl caused upon initial reduction of the ketone. The adjacent aromatic ring helps stabilise the developing (+) charge as the C-O bond cleaves, which is what makes benzylic ketones good substrates for this reaction. 


  
  
  Ref: J. Med. Chem. 2001, 44, 3424 


In the context of lab scale chemistry (i.e. not industrial processes), several good methods exist including the Wolff–Kishner (or variants as Jan pointed out in the comments), the Clemmensen, and the Mozingo reduction. Some success is also noted via initial reduction, mesyaltion, and treatment with a hydride source.