# Differences between Urushibara nickel and Raney nickel

The Wikipedia article about Urushibara nickel catalyst is rather short and vague. What is the mechanism for its preparation, and furthermore, in what sense does it differ from Raney nickel (i.e. when should you prefer the one over the other)?

• If you read the Wikipedia article on Raney Nickel, you would have a good start. en.wikipedia.org/wiki/Raney_nickel – LDC3 Nov 23 '14 at 15:00
• @LDC3 Urushibara nickel is not mentioned in that article at all. – Jori Nov 23 '14 at 16:51
• But it does tell you how to make Raney Nickel, and with the article you posted, you can tell how each is made. – LDC3 Nov 23 '14 at 17:09
• @LDC3 That still does not address the question at all. Wikipedia does not talk about differences in reactivity and uses, other than "It can be used for most hydrogenations where Raney nickel can be used.", which is not very useful. – Jori Nov 27 '14 at 11:53
• Both of these statements are from Wikipedia: U-Ni: First nickel is precipitated in metallic form by reacting a solution of a nickel salt with zinc. R-Ni Raney nickel is a fine-grained solid composed mostly of nickel derived from a nickel-aluminium alloy. So you see, R-Ni starts as an alloy and U-Ni starts as a solution. If you were looking for the method of preparation, why didn't you ask for that. – LDC3 Nov 27 '14 at 14:58