Iron-aluminum series, catalyst

Nickel hydroxides, 17 111 Nickel—iron alloys, 17 101 Nickel—iron—aluminum catalyst, 17 121 Nickel—iron cells, 3 491—493 Nickel—iron—chromium alloy 825 in galvanic series, 7 805t Nickel—iron—chromium alloys, 17 102—103 Nickel—iron plating, 9 821 Nickel itch, 12 691, 701 Nickel—matrix composites, 17 104 Nickel metal, forms of, 17 95—99 Nickel metal hydride cells, 3 431, 471, 509-512... 

Treatment of butadiene or 1,4-butanediol with hydrogen sulfide over an alumina catalyst, or an iron sulfide/alumina catalyst, leads to the formation of thiophene. This method has been more useful in the benzothiophene series. Styrene with four equivalents of hydrogen sulfide, when passed over an iron sulfide/aluminum oxide catalyst at 600 °C for 20 seconds, gave a 60% mole conversion to benzo[6]thiophene (47JA2008). Similar treatment of ethylbenzene over a chromium oxide-alumina catalyst gave an 18% yield of benzo[6]thiophene, accompanied by the evolution of hydrogen (48JA2495). 

The activity of NiO has been studied by Wagner and Hauffe (47) and others (22,49,50). Catalytic activity of this oxide is enhanced considerably by the addition of manganese dioxide. For the simple oxides, the activity decreases in the following series Mn02 > C02O3 > NiO > CuO (48). The catalysts containing nickel oxide are promoted by the addition of oxides of iron, copper, aluminum, and chromium. Iron, nickel, and cobalt chromites, as catalysts for the oxidation of CO, were investigated by Lory (30). 

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