The invention relates to a catalyst system for producing maleic anhydride by means of the catalytic oxidation of n-butane, comprising at least one reactor tube, which has two catalyst layers consisting of different catalyst particles, characterized in that the geometric surface area per catalyst particle is greater in the catalyst layer that is first in the gas flow direction than in the second catalyst layer. The invention further relates to a process for producing maleic anhydride by means of the catalytic oxidation of n-butane, wherein a mixture of oxygen and n-butane is fed through the catalyst system according to the invention and the at least one reactor tube is at elevated temperature.

An integrated catalyst can be used in an olefin disproportionation reaction. The integrated catalyst contains a plurality of different integrated active phases. The relative positions among different active phases remain substantially unchanged during the olefin disproportionation reaction. The effective distance between respective bisecting planes of two adjacent different active phases is 0.5-5 mm, preferably 1-3 mm.

An integrated catalyst can be used in an olefin disproportionation reaction. The integrated catalyst contains a plurality of different integrated active phases. The relative positions among different active phases remain substantially unchanged during the olefin disproportionation reaction. The effective distance between respective bisecting planes of two adjacent different active phases is 0.5-5 mm, preferably 1-3 mm.

A PbO/Co.sub.3O.sub.4/MgO nanocomposite material includes an orthorhombic PbO crystalline phase, a cubic Co.sub.3O.sub.4 crystalline phase, and a cubic MgO crystalline phase. The average crystallite size of the PbO/Co.sub.3O.sub.4/MgO nanocomposite material is in a range from 75 to 90 nm.

A PbO/Co.sub.3O.sub.4/MgO nanocomposite material includes an orthorhombic PbO crystalline phase, a cubic Co.sub.3O.sub.4 crystalline phase, and a cubic MgO crystalline phase. The average crystallite size of the PbO/Co.sub.3O.sub.4/MgO nanocomposite material is in a range from 75 to 90 nm.

An intermediate article has a non-electrically conductive substrate having first and second opposing surfaces; and a catalytic ink disposed as a pattern of half-tone dots on at least the first opposing surface. Copper metal can be plated on the pattern of catalytic ink to provide a copper metal pattern that have antimicrobial properties. The resulting antimicrobial article can then be applied to various surfaces to mitigate the spread of infectious agents from one person to another.

An intermediate article has a non-electrically conductive substrate having first and second opposing surfaces; and a catalytic ink disposed as a pattern of half-tone dots on at least the first opposing surface. Copper metal can be plated on the pattern of catalytic ink to provide a copper metal pattern that have antimicrobial properties. The resulting antimicrobial article can then be applied to various surfaces to mitigate the spread of infectious agents from one person to another.

This invention is directed to transition metal-based-halloysite nanocomposites and methods of making and using the same.

This invention is directed to transition metal-based-halloysite nanocomposites and methods of making and using the same.

A method of producing hydrogen gas comprising: hydrolyzing sodium borohydride (NaBH.sub.4) with water at a temperature of from 20 to 75 C. in the presence of a nanocomposite catalyst. The method is characterized in that the ratio by weight of sodium borohydride to the nanocomposite catalyst is from 1:1 to 5:1. Further, the nanocomposite catalyst comprises graphite sheet particles on which are disposed nanorods of -MnO.sub.2 and nanoparticles of MgO.