How nickel catalyst are prepared?

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Jürgen Wintner

Nickel is used as NiSO4:

http://www.essecouk.com/schede/NICKEL%20CATALYSED%20AMMONIUM%20BISULPHITE%20SOLUTION%2065%20PS%203N.pdf

Anand S. Burange

Generally nitrate precursors are preferred over sulfates since its difficult to wash out sulfate ions.

Nickel nitrates can be precipitated under alkaline condition followed by calcination to get its oxide material.

Omar M. Yahya

Nickel in reactions can be used as a catalyst by salts of this element such as Lewis acids such as nickel nitrate or nickel chloride