Abstract: There are disclosed antitumor active 1,2-diphenyl-ethylenediamine)-platinum(II)-complex of the general formula ##STR1## wherein R.sub.7 is hydrogen or C.sub.1 -C.sub.6 -alkyl and R.sub.2 is either (1) a halogen atom and the groups R.sub.1, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are the same or different and are hydrogen, halogen, trihalomethyl, C.sub.1 -C.sub.6 -alkyl, hydrogen C.sub.1 -C.sub.6 -alkoxy, a C.sub.2 -C.sub.6 -alkanoyloxy or a halo or C.sub.1 -C.sub.4 -alkanesulfonyloxy substituted C.sub.2 -C.sub.6 -alkanoyloxy group, or R.sub.2 is (2) a hydroxy group, a C.sub.1 -C.sub.6 -alkoxy group, a C.sub.2 -C.sub.6 -alkanoyloxy group in the 4-position or a halo or C.sub.1 -C.sub.4 -alkanesulfonyloxy substituted C.sub.2 -C.sub.6 -alkanoyloxy group and if R.sub.2 is (2) then the groups R.sub.1 and R.sub.3 which are the same or differnt are in the 2 and 6 positions of the phenyl group and are halogen, trihalomethyl, C.sub.1 -C.sub.6 -alkyl, hydroxy, a C.sub.1 -C.sub.6 -alkoxy, C.sub.2 -C.sub.

Abstract: A process for making hydroxyl ammonium salts by hydrogenation of nitric oxide in an acid medium in the presence of a platinum catalyst, wherein the catalyst contains 15 to 50 atom percent of selenium and the acid medium is at least 2N during the reaction. A new catalyst and method of making it are also disclosed.

Abstract: Novel platinum catalysts and a method for their preparation are disclosed. They are prepared by treating catalysts of platinum metal with salts of sulfurous acid or with sulfur compounds which liberate sulfurous acid in the presence of an acid. The treatment is conducted in the presence of hydroxylammonium salts in acid medium and in the absence of oxidizing agents capable of oxidizing sulfurous acid to form sulfate. The resulting catalysts are useful in preparing hydroxylamine.

Abstract: The invention relates to welding of sheet metal covered with non-metallic layers, and relates more particularly to a method for the spot- or roller seam- welding of sheet metal covered with non-metallic layers by removing the layer from the zones to be welded and subsequently applying a rust-protective layer over the welded zones, wherein on the zones to be welded circular or strip-shaped parts of the covering layer are mechanically removed by milling, rasping or grinding; the metallic zones of the sheet metal thus stripped bare are interwelded by means of opposed electrodes; and finally on the welded zones circular or strip-shaped parts, respectively, of a layer are applied by cementing, spraying or painting, for the formation of a uniform covering layer.

Abstract: A process for reactivating platinum catalysts is disclosed. It comprises treating a platinum catalyst having reduced activity and selectivityA. in a first stage with an acid solution of a sulfur compound which liberates sulfurous acid in acid medium, and a hydroxylammonium salt, said treatment being conducted in the absence of oxidizing agents capable of oxidizing sulfurous acid to sulfate, andB. in a second stage with an acid solution of platinum (II) or platinum (IV) compounds in the presence of hydrogen.

Abstract: A process is disclosed whereby an improved platinum metal-containing catalyst is prepared. Standard platinum metal catalysts are treated with sulfur compounds which liberate sulfurous acid in acid media. The sulfur compounds contain 15 to 150 atom % of sulfur based on the platinum metal present. The treatment is conducted in the presence of hydroxylammonium salts in acid media and in the absence of reducing agents which are capable of reducing sulfurous acid to sulfide.

Abstract: Method and apparatus for reacting nitric oxide with H.sub.2 in the presence of noble metal catalysts in which waste gas is obtained by separating the gas contained in a liquid medium flowing countercurrently to the bubbles in a counter-current bubble column. Preferably, only a portion of the separated gas is removed as waste gas, the remainder being recycled. The apparatus comprises a counter-current bubble column having a gas recycling circuit to permit the recycling of excess NO contained in the separated gas.