Abstract: Activated alumina agglomerates having a crush resistance of at least 12 daN, measured on that fraction thereof having a mean diameter ranging from 3 to 4 mm, and an adsorptive capacity greater than 18% by weight, well adopted as adsorbents in a wide variety of purification processes, are prepared by agglomerating activated alumina particulates, maturing the resulting agglomerates in the presence of a complexing agent for the cation Al.sup.3+, and then thermally treating the matured agglomerates at a temperature ranging from about 100.degree. to 500.degree. C.

Abstract: Catalyst compositions well adopted for the oxidation of olefins into .alpha.,.beta.-unsaturated aldehydes, e.g., for the oxidation of propylene into acrolein, comprise a particulate support substrate uniformly coated with 15% to 33% by weight of an adherent layer of a catalytically active phase, such support substrate comprising inert and solid spheres having a diameter ranging from 0.5 to 6 mm, such catalytically active phase comprising a catalytically effective amount of bismuth and iron molybdate, dopant amounts of phosphorus and potassium and, optionally, at least one other catalytically active metal or non-metal, and the phosphorus and the potassium each being present in such catalytically active phase in an atomic quantity ranging from 0.005 to 0.06 per 12 atoms of molybdenum, or of molybdenum plus any tungsten therein.

Abstract: Catalyst compositions well adopted for the oxidation of olefins into .alpha.,.beta.-unsaturated aldehydes, e.g., for the oxidation of propylene into acrolein, comprise a particulate support substrate uniformly coated with 15% to 33% by weight of an adherent layer of a catalytically active phase, such support substrate comprising inert and solid spheres having a diameter ranging from 0.5 to 6 mm, such catalytically active phase comprising a catalytically effective amount of bismuth and iron molybdate, dopant amounts of phosphorus and potassium and, optionally, at least one other catalytically active metal or non-metal, and the phosphorus and the potassium each being present in such catalytically active phase in an atomic quantity ranging from 0.005 to 0.06 per 12 atoms of molybdenum, or of molybdenum plus any tungsten therein.

Abstract: Coated catalyst particulates, well adopted for the oxidation of olefins into .alpha.,.beta.-unsaturated aldehydes, e.g., for the oxidation of propylene into acrolein, and the coating layer of which comprising a catalytically active phase including a catalytically effective amount of bismuth and iron molybdate and dopant amounts of phosphorus and potassium, are prepared by providing a calcined and ground catalytically active intermediate composition devoid of phosphorus and potassium values, coating this intermediate composition onto a particulate support substrate comprising rough-surfaced inert and solid spheres, also coating phosphorus and potassium values onto the particulate support substrate, and then calcining the support particulates thus coated.

Abstract: Activated alumina agglomerates having a crush resistance of at least 12 daN, measured on that fraction thereof having a mean diameter ranging from 3 to 4 mm, and an adsorptive capacity greater than 18% by weight, well adopted as adsorbents in a wide variety of purification processes, are prepared by agglomerating activated alumina particulates, maturing the resulting agglomerates in the presence of a complexing agent for the cation Al.sup.3+, and then thermally treating the matured agglomerates at a temperature ranging from about 100.degree. to 500.degree. C.