Nickel alumina

Effect of Catalyst The catalysts used in hydrotreating are molybdena on alumina, cobalt molybdate on alumina, nickel molybdate on alumina or nickel tungstate. Which catalyst is used depends on the particular application. Cobalt molybdate catalyst is generally used when sulfur removal is the primary interest. The nickel catalysts find application in the treating of cracked stocks for olefin or aromatic saturation. One preferred application for molybdena catalyst is sweetening, (removal of mercaptans). The molybdena on alumina catalyst is also preferred for reducing the carbon residue of heating oils. 

Mix 0.01 M dimethyltryptamine, 0.02 M phosphate buffer pH 7.2 containing 5 mM ascorbic acid, 0.02 M disodium EDTA and 0.01 M ferrous sulfate (CuCI may substitute) and add with stirring at 20-22° 0.02 M H202 (0.01 M may increase yield). Let reaction proceed to completion (2 hours or less) and extract with ethyl acetate. Dry and evaporate in vacuum to get about 30% yield of psilocin. The product, which contains the other OH-DMT s as well, can be chromatographed on silica thin layer with t-butanol-acetic acid-water (ACS 22,1210 (1968)) or on a 5% alumina-Nickel... 

The results with magnesia led us to a planned series of experiments with doped aluminas. Nickel was evaporated in vacuo onto the surface of grains of undoped or doped alumina or, alternatively, onto compact nickel. These preparations were then used as catalysts for the donor model reaction of formic acid dehydrogenation as above. Table II shows the results. 

HYDROGENATION, CATALYSTS Nickel on alumina. Nickel-Graphite. Palladium-Poly(ethylenimine). Palladium catalysts. Raney nickel. Rhodium catalysts. 

Aharon, O., Bar-Ziv, S., Gomi, D., Cohen-Hyams, T. and Kaplan, W.D., Residual stresses and magnetic properties of alumina-nickel nanocomposites , Scripta Mater, 2004 50(9) 1209-1213. 

Supported Nickel. - The interaction of nickel with siUca and alumina at various stages of catalyst preparation has been extensively studied and only some recent evidence for interaction and its effect on performance are noted here. Nickel nitrate impregnated on silica decomposed to NiO during calcination, which interacted little with the support, whereas the ESCA spectrum of low nickel loadings on 7-alumina were quite different and NiO only appeared once the surface sites were filled. After reduction at 673 K and examination by ESCA without exposure to air, it was shown that percentage reduction depended on both Ni content and calcination temperature, which was considered indicative of a strong interaction between nickel and alumina. Nickel ions in octahedral sites are readily reduced and increasing the calcination temperature makes them diffuse to tetrahedral sites where they are difficult to reduce. 

Silica-alumina-nickel oxide gel Si02/ AI2O3 molar ratio of 30-500 1 and NiO/ Si02 molar ratio from 0.001-0.01 1... 

Silica-alumina-nickel oxide, amorphous to X-rays, with a high ratio of Si02/ AI2O3 was found to be a suitable catalyst for dimerizing isobutene into a- and P-di-isobutene with high selectivity and was also useful for oligomerizing propene to dimers and trimers. ... 

Keywords alumina, nickel, glucose, citrate, temperature-programmed reduction... 

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