Showing papers on "Selective catalytic reduction published in 1969"

Process for urea production in combination with ammonia synthesis

Abstract: A process for the production of urea from ammonia and carbon dioxide, combined with the preparation of ammonia, is disclosed wherein ammonium carbamate in the urea solution produced is removed from said urea solution by subjecting the urea solution to two stripping stages. The first stripping stage uses the urea synthesis starting gas, which contains hydrogen, nitrogen and carbon dioxide. The second stripping stage, which is at substantially the same pressure as the first stripping stage, uses a gas containing at least one of the components needed in the ammonia synthesis. This second stripping gas is substantially free of ammonia and carbon dioxide. The disclosed process has the advantage, compared to prior processes, that the stripping gases need not be compressed at relatively high temperatures.

Improvements in and relating to the Catalytic Reduction of Aromatic Ketones and Aromatic Aldehydes

Abstract: 1,159,967. Hydrogenation catalysts. JOHNSON MATTHEY & CO. Ltd. 11 Nov., 1966 [15 Nov., 1965], No. 48313/65. Heading B1E. [Also in Division C2] A catalyst composition comprising a supported palladium catalyst into which has been incorporated an amine and preparation thereof by mixing the dry catalyst with water to form a slurry which is then mixed with the amine. The preferred amines are primary aromatic amines such as aniline, p-toluidine and benzylamine or a heterocyclic tertiary amine such as quinoline. The catalyst as prepared above has application in the reduction of a ketone or aromatic aldehyde to the corresponding alcohol and may be used as the slurry or after rapid washing with acetone and air drying, or after drying in a vacuum dessicator.

Investigations on catalytic reduction of nitroanthraquinones: Communication 1. Hydrogenation on Pd/C catalyst in concentrated sulfuric acid

Abstract: 1. Reaction of catalytic hydrogenation of 1-nitroanthraquinones on Pd/C catalyst in sulfuric acid was investigated. 2. Under the given conditions, the process proceeds in two directions, viz. with the formation of aminoanthraquinones and 1-amino-4-hydroxyanthraquinones. 3. When the concentration of sulfuric acid is lowered to 70%, the reaction proceeds selectively giving high yields (90%) of the amino derivates.

Stereochemistry of the reduction of 1, 5-dimethylpiperidone-3

Abstract: 1. The stereochemistry of the hydride and catalytic reduction of 1, 5-dimethylpiperidone-3 is studied. 2. The results obtained are associated with the specific adsorption of the 3-ketopiperidine molecule on the catalyst surface or with the structure of the ionic pair NΘ... BH4Θ in the hydride reduction in aqueous solution.

Catalysis of hydrogen transfer by methods believed to be similar to enzymatic methods

Abstract: 1 Organic catalysts of theπ-acceptor type of the reduction of 2,2,6,6-tetramethylpiperidone-4-oxy-1 with 2,6-dimethyl-3,5-dicarbethoxy-1,4-dihydropyridine were found 2 Catalytic systems includingπ-acceptors were produced In the presence of the catalytic system ofπ-acceptor and o-naphthoquinone, the reduction of 2,2,6,6-tetramethylpiperidone-4-oxy-1, nitro-compounds, and molecular oxygen with dihydropyridine compounds and cyclohexadiene-1,4 can be conducted 3 The kinetics of the catalytic reduction of 2,2,6,6-tetramethylpiperidone-4-oxy-l was investigated It was proposed that the mechanism of the action of the indicated catalysts and catalytic systems involves the formation ofπ-complexes including a reducing agent as the donor