Lazier catalyst Copper chromite

Hydrogenation Copper chromite (Lazier catalyst). Copper chromium oxide (Adkins catalyst). Lindlar catalyst (see also Lithium ethoxyacetylide, Malealdehyde, Nickel boride). Nickel catalysts. Palladium catalysts. Palladium hydroxide on carbon. Perchloric acid (promoter). Platinum catalysts. Raney catalysts, Rhenium catalysts. Rhodium catalysts. Stannous chloride. Tributylborane. Trifluoroicetic acid, Tris (triphenylphosphine)chlororhodium. 

Copper chromite (Lazier catalyst). Supplier Harshaw (CU-0202P 556-002). For preparation of the catalysC an aqueous solution of barium nitrate and cupric nitrate trihydrate is stirred during addition of a solution of ammonium chromate, prepared from ammonium dichromate and aqueous ammonia. The reddish brown precipitate of copper barium ammonium chromate is washed and dried and decomposed by heating in a muffle furnace at 350-450 . The ignition residue is pulverized, washed with 10% acetic acid, dried, and ground to a fine black powder. 

Copper chromite (Lazier catalyst), 156, 975 Copper-Chromium oxide, 157 Copper powder, 157-158 Copper powder-Benzoic acid, 158 Copper salts, 158... 

Laccaic acid, 537 a-Lactams, 756, 924, 8-Lactams, 234 Lactose, 61,1171 A .8( )-Lanostadiene, 151 A -Lanostene derivative, 468 Lanosterol, 916 5o-Lanosteryl 3 3-formate, 599 Laudanosine, 1106 methochloride, 1106 Laurie acid, 648-649, 666,1263, 1271 Laurone, 1199 Lauroyl azide,1041,1042 Lauroyl chloride, 1041, 1042,1199 Lauryl alcohol, 453 Lauryl bromide, 453, 1165 Lauryl mercaptan, 1165 Lazier catalyst, see Copper chromite Lead acetate trihydrate, 433,532-533 Lead dioxide, 215, 347, 409, 533-536, 537, 543, 554... 

When Adkins tried to modify the Lazier recipe and make a copper chromite hydrogenation catalyst, he found that an active black cupric oxide was produced instead of the red oxide claimed by Lazier. Adkins and Folkers subsequently suggested modifications to the recipe, including the addition of barium, magnesium, or calcium oxides to stabilize the black oxide form, which was more active. Atypical recipe and catalyst composition is shown in Table 3.11. 

Lazier of Du Pont published many patents covering the preparation of metal chromites." These were formed by precipitation from a solution of zinc nitrate and chromic acid with ammonia at pH 6.8. The zinc ammine complex obtained was decomposed at about 400°C to give the mixed oxides. As Adkins noted, his copper chromite equivalent was extracted with dilute acetic acid solution to adjust the copper content. It is not clear whether the same treatment was ever used in producing methanol catalysts or even whether the zinc ammine intermediate was produced commercially. One problem with the Lazier preparation was the difficulty in controlling the exothermic decomposition of the ammine that could affect the catalyst activity. 

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