The present invention relates to a mixed oxide of aluminium, of zirconium, of cerium, of lanthanum and optionally of at least one rare-earth metal other than cerium and lanthanum that makes it possible to prepare a catalyst that retains, after severe ageing, a good thermal stability and a good catalytic activity. The invention also relates to the process for preparing this mixed oxide and also to a process for treating exhaust gases from internal combustion engines using a catalyst prepared from this mixed oxide.

Embodiments of catalyst systems and methods of synthesizing catalyst systems are provided. The catalyst system may include a core comprising a zeolite; and a shell comprising a microporous fibrous silica. The shell may be in direct contact with at least a majority of an outer surface of the core. The catalyst system may have a Si/Al molar ratio greater than 5. At least a portion of the shell may have a thickness of from 50 nanometers (nm) to 600 nm.

The present invention relates to a calcined medium, in particular a catalyst or a catalyst medium or an adsorbent/absorbent mass, in particular in the form of extrudates, pellets, granules or beads, the medium comprising a porous matrix comprising carbonates, clays, zeolites, oxides, or metal and/or silicon hydroxides, and the matrix incorporating hollow mineral microspheres having a different composition in a content of between 0.3 and 50% by weight, in particular between 0.5 and 15% by weight, of the matrix.

The present invention relates to catalytically active material, comprising grains of non-graphitizing carbon with nickel nanoparticles dispersed therein, wherein dp, the average diameter of nickel nanoparticles in the non-graphitizing carbon grains, is in the range of 1 nm to 20 nm, D, the average distance between nickel nanoparticles in the non-graphitizing carbon grains, is in the range of 2 nm to 150 nm, and ω, the combined total mass fraction of metal in the non-graphitizing carbon grains, is in the range of 30 wt % to 70 wt % of the total mass of the non-graphitizing carbon grains, and wherein dp, D and ω conform to the following relation: 4.5 dp/ω>D≥0.25 dp/ω. The present invention, further, relates to a process for the manufacture of material according to the invention, as well as its use as a catalyst.

The supported catalyst synthesis device according to the present disclosure includes a first source for a liquid containing a reducing agent; a second source for a liquid containing elements to constitute single-metal fine particles or solid solution fine particles to be supported; a third source for a liquid containing support particles; a reaction unit that joins flows of these liquids; a liquid feed route connecting between the first source and the reaction unit; a liquid feed route connecting between the second source and the reaction unit; a liquid feed route connecting between the third source and the reaction unit; and a collection unit, connected to the reaction unit via a pipe, to collect a produced reaction product, and further includes a pressure adjustment mechanism connected to the collection unit.

Here disclosed is a composite catalyst for methane cracking and a method of producing the composite catalyst. The composite catalyst includes a substrate formed of metal oxide, and one or more catalytic transition metals solubilized in the metal oxide, wherein the metal oxide includes a metal which differs from the one or more catalytic transition metals, wherein the metal oxide forms a matrix which the one or more catalytic transition metals are solubilized in to render transition metal ions from the one or more catalytic transition metals, wherein the transition metal ions under a reducing atmosphere diffuse to reside as transition metal nanoparticles at a surface of the substrate and the transition metal nanoparticles under an oxidizing atmosphere diffuse away from the surface to reside as transition metal ions in the metal oxide, and wherein the transition metal nanoparticles at the surface induce carbon from the methane cracking to deposit on the transition metal nanoparticles and have the carbon deposited grow away from the substrate.

The present invention relates to catalytically active material, comprising grains of non-graphitizing carbon with iron nanoparticles dispersed therein, wherein d.sub.p, the average diameter of iron nanoparticles in the non-graphitizing carbon grains, is in the range of 1 nm to 20 nm, D, the average distance between iron nanoparticles in the non-graphitizing carbon grains, is in the range of 2 nm to 150 nm, and ω, the combined total mass fraction of metal in the non-graphitizing carbon grains, is in the range of 30 wt % to 70 wt % of the total mass of the non-graphitizing carbon grains, and wherein d.sub.p, D and ω conform to the following relation: 4.5 d.sub.p/ω>D≥0.25 d.sub.p/ω. The present invention, further, relates to a process for the manufacture of material according to the invention, as well as its use as a catalyst.

A process for synthesis of PtNi high surface area core/shell particles. The processing including formation of PtNi nanoparticles, exposure of the PtNi nanoparticles to oxygen to form a nickel oxide coating on the nanoparticles at the same time the segregation of Ni to surface induces a Pt-skin with PtNi core structure, removal of the nickel oxide coating to form PtNi core/Pt shell (or Pt-skin) structure.

A nano-catalyst which is usable in processes of vegetable oil hydrogenation for producing bio-lubricants or biodegradable plastics for producing copolymers, characterized in that it consists of an active phase composed of nickel, palladium and ruthenium, dispersed on a support including graphene layers less than 1 micron, the outer surface of which is covered with surfactant chains, and having a high activity and a very high selectivity for the cis-configuration of the 9-octadecenoic acid (cis-oleic acid).

This invention provides a catalyst composition characterized in that the catalyst composition comprises one or more rare earth oxophosphorus components.