Rich nickel catalysts

If the rich gas from the CRG reactor is passed over another bed of high-nickel catalyst at a lower temperature, the equilibrium of the five components is reestablished. Carbon oxides react with hydrogen to form methane and the calorific value of the gas is increased. It should be noted that this methanation step differs from that encountered in ammonia synthesis gas production because of the high steam content the temperature rise is reduced and there is no possibility of temperature runaway as the... 

Catalytic hydrogenation in the vapor phase of isomeric cresols over nickel catalysts at a high temperature leads to alcohols rich in the equatorial isomer. 

Using nickel catalysts of electronically tuneable phosphinite ligands, 105, an equally dramatic electronic effect on enantioselectivity has been observed (Scheme 37). An e.e. of 16% using an electron-rich ligand can be improved to 85-91% e.e. using an otherwise similar electron-poor ligand. This is the best e.e. observed for this reaction. 

Considering the selectivity of this reaction (terminal vs. 1,2-disubstituted alkenes) and the fact that an electron-rich alkene such as isobutyl vinyl ether does not undergo cyclopropanation, it seems that the reactive species formed from the lithiated sulfone and the nickel catalyst does not behave as an electrophilic carbenoid. In this respect, one should note that the Simmons-Smith reagent is electrophilic whereas the methylene transfer reagent arising from treatment of dibromomethane with nickel(O) can achieve cyclopropanation of electron-deficient alkenes only. ... 

E-J Shin, MA Keane. Detoxifying chlorine rich gas streams using solid supported nickel catalysts. J. Hazard. Mater. B 66 265-278, 1999. 

Raney Nickel catalysts are extensively used industrially and in laboratories in hydrogenation, hydrogenolysis and other reactions. NiR were prepared by removing A1 from Al-rich Al-Ni alloys in alkali solutions. The residue consists of small Ni particles connected in a porous agglomerate with small amounts of A1 in a metallic state and also in an oxidized state as alumina (1). 

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