Abstract: A novel catalyst composition is disclosed which comprises a catalytically-active metal oxide component containing the oxides of cobalt, molybdenum, bismuth, and iron corresponding to the empirical formula:Co.sub.a Mo.sub.12 Fe.sub.b Bi.sub.c O.sub.xwherein:A is a value of between about 8 and about 10,B is a value of between about 0.5 and about 2,C is a value of between about 0.5 and about 2,And x equals the sum of 1.5c+1.5b+a+36 and including a crystalline phase having the empirical formula Bi.sub.2 Mo.sub.2 Fe.sub.2 O.sub.12.The catalyst composition is prepared by subjecting a conventionally prepared precursor composition to a two-step calcination, comprising two calcining procedures at a temperature of 450.degree.-500.degree. C. and an intermediate cooling to ambient temperature. The novel catalysts exhibit a high activity and selectivity in a process for preparing .alpha.,.beta.-unsaturated aldehydes by oxidizing olefins.

Abstract: The invention concerns catalysts for treating residual gases, containing hydrogen and carbon derivatives of sulphur, by the Claus reaction. These catalysts have a specific area of at least 80 m.sup.2 /g and essentially comprise active alumina and a titanium compound. They enable carbon compounds of sulphur to be destroyed and the Claus reaction proper to be obtained with good yields.

Abstract: The invention is addressed to the manufacture of chlorinated hydrocarbons by catalytic oxychlorination, in which the chlorine is derived, at least in part, from ammonium chloride, and in which a suitable catalyst comprises a support formed of silica and magnesium with a catalytic active portion formed of copper chloride and an alkali metal chloride. Such catalysts give good yields, little combustion of hydrocarbons and low impurities.

Abstract: Catalysts for Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sq.m./g and is composed of activated alumina and a compound of a metal of column III A of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst.

Abstract: Catalysts for Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sq.m./g and is composed of activated alumina and a compound of lanthanum, a lanthanide series metal of atomic number 58 to 71 or a metal of Group IIIB of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst.

Abstract: A catalyst support composed of silica and magnesia prepared by calcining particles of a silica hydrogel containing magnesium cations and an anion containing chlorine and/or bromine. The supports of this invention can be impregnated with catalytically active components to produce catalysts suitable for use in the non-selective oxychlorination of lower aliphatic hydrocarbons such as ethylene.