Abstract: An improved method for preparing a hydrocarbon hydrotreating catalyst containing a major amount of alumina and a minor amount of at least one Group VIB or Group VIII metal comprising:(1) contacting an aqueous mixture of hydrous alumina with at least one phosphorus-containing compound in an amount sufficient to increase the hydrocarbon hydrotreating activity of the final catalyst and forming a phosphorus-containing hydrous alumina;(2) calcining the phosphorus-containing hydrous alumina and forming a calcined alumina;(3) contacting the calcined alumina with at least one metal-containing compound and forming a metal-containing material, the metal being selected from the group consisting of Group VIB metal, Group VIII metal and mixtures thereof; and(4) calcining the metal-containing material and forming a catalyst having increased hydrocarbon hydrotreating activity.Improved hydrocarbon hydrotreating processes and catalysts are also disclosed.

Abstract: An improved method for preparing a hydrocarbon hydrotreating catalyst containing a major amount of alumina and a minor amount of at least one Group VIB or Group VIII metal comprising:(1) contacting an aqueous mixture of hydrous alumina with at least one phosphorus-containing compound in an amount sufficient to increase the hydrocarbon hydrotreating activity of the final catalyst and forming a phosphorus-containing hydrous alumina;(2) calcining the phosphorus-containing hydrous alumina and forming a calcined alumina;(3) contacting the calcined alumina with at least one metal-containing compound and forming a metal-containing material, the metal being selected from the group consisting of Group VIB metal, Group VIII metal and mixtures thereof; and(4) calcining the metal-containing material and forming a catalyst having increased hydrocarbon hydrotreating activity.Improved hydrocarbon hydrotreating processes and catalysts are also disclosed.

Abstract: Alumina particles derived from hydrous alumina predominating in .alpha.-alumina monohydrate having a crystallite size of less than 100A and having increased porosity can be prepared by a process which comprises forming a mixture of an aqueous slurry of the hydrous alumina and at least one surface active agent, drying this mixture, forming macrosize particles from the dried mixture and calcining the macrosized particles.

Abstract: Alumina particles derived from hydrous alumina predominating in .alpha.-alumina monohydrate having a crystallite size of less than 100A and having increased porosity can be prepared by a process which comprises forming a mixture of an aqueous slurry of the hydrous alumina and at least one surface active agent, drying this mixture, forming macrosize particles from the dried mixture and calcining the macrosized particles.This invention relates to improved alumina and alumina-based particles. More particularly, the invention relates to the manufacture of alumina and alumina-based particles having improved physical properties and being useful, for example, as catalysts and catalyst supports.Alumina-based catalysts are useful in many industrial applications, e.g., petroleum reforming and desulfurization, aromatization, paraffin and aromatic hydrocarbon isomerization and the like. In many of these applications the activity of the alumina-based catalyst is directly related to the porosity, i.e.

Abstract: Improved methods for reducing the amounts of hydrocarbon, carbon monoxide and nitrogen oxides in the exhaust gases of internal combustion engines involving the use of catalysts comprising a major amount of crystalline magnesium aluminate spinel. Improved catalysts as well as improved methods for making the present catalyst are also included.

Abstract: A composition of matter useful as a catalyst support which comprises macrosized particles of a mixture of two distinct phases. These phases are:1. calcined discrete entities comprising alumina a major portion of which have a minimum dimension greater than about 50 microns and a maximum dimension of less than about 200 microns; and2. a phase comprising calcined alumina.Methods for producing this composition of matter and for using this composition of matter in a hydrocarbon conversion process are also included.

Abstract: A solid phase catalyst composition comprising a complex of nickel, a Group V-A electron donor ligand, and a non-protonic Lewis acid and reducing agent on a solid, acidic silica-based support. Exemplary is a complex comprising nickel acetylacetonate, trialkylphosphine, and ethylaluminum sesquichloride on a solid, acidic silica-based support. Use of the catalyst in the polymerization of olefin hydrocarbons is also disclosed.

Abstract: A composition of matter useful, for example, as a catalyst component, comprising macrosized particles containing a mixture of two distinct phases, the phases being 1) calcined discrete entities comprising first alumina a major portion of which have a minimum dimension greater than about 50 microns and a maximum dimension of less than 200 microns and 2) a phase comprising calcined second alumina wherein the weight ratio of (1) to (2) is within the range from about 0.05:1 to about 2:1 and the second alumina is first calcined after the formation of microsize particles.Methods for producing this composition of matter and for using this composition of matter in a hydrocarbon conversion process are also included.

Abstract: Improved methods for reducing the amounts of hydrocarbon, carbon monoxide and nitrogen oxides in the exhaust gases of internal combustion engines involving the use of catalysts comprising a major amount of crystalline magnesium aluminate spinel. Improved catalysts as well as improved methods for making the present catalyst are also included.