A method for producing a catalyst system for gas reactions comprising at least one planar structure of noble metal having gas-permeable openings, comprising the steps of:

(1) providing at least one noble metal powder consisting of at least substantially spherical noble metal particles, and

(2) repeatedly applying the noble metal powder or powders provided in step (1) in layers to a substrate in a build chamber, respectively followed by an at least partial melting of the respective noble metal powder applied as a layer with high-energy radiation, and allowing the melted noble metal powder to solidify within the scope of additive manufacturing.

A catalyst composition for selective catalytic reduction of NO.sub.x by ammonia or compounds, such as urea, generating ammonia under exhaust gas conditions. The composition includes a) a copper ion exchanged zeolite particles having a Si/Al.sub.2 molar ratio (SAR) of 15 or less and a copper content sufficiently high to perform the catalytic reduction, b) a nanocrystalline aluminium compound in an amount sufficient for stabilizing the zeolite, and c) a zirconium compound in an amount sufficient to improve hydrothermal durability of the catalyst composition.

A catalyst composition for selective catalytic reduction of NO.sub.x by ammonia or compounds, such as urea, generating ammonia under exhaust gas conditions. The composition includes a) a copper ion exchanged zeolite particles having a Si/Al.sub.2 molar ratio (SAR) of 15 or less and a copper content sufficiently high to perform the catalytic reduction, b) a nanocrystalline aluminium compound in an amount sufficient for stabilizing the zeolite, and c) a zirconium compound in an amount sufficient to improve hydrothermal durability of the catalyst composition.

A microsphere of oxide has an opening on its surface connected to a hollow core inside, forming a cavity. The oxide the microsphere is made of is selected from the group consisting of alumina, silica, zirconia, magnesium oxide, calcium oxide and titania. The microsphere of oxide shows better mass and heat transfer characteristics, and has strength significantly higher than that of existing products with similar structures. A FT synthesis catalyst has the microsphere of oxide as a support and an active metal component disposed on the support. The active metal component is one or more selected from the group consisting of Co, Fe, and Ru.

A microsphere of oxide has an opening on its surface connected to a hollow core inside, forming a cavity. The oxide the microsphere is made of is selected from the group consisting of alumina, silica, zirconia, magnesium oxide, calcium oxide and titania. The microsphere of oxide shows better mass and heat transfer characteristics, and has strength significantly higher than that of existing products with similar structures. A FT synthesis catalyst has the microsphere of oxide as a support and an active metal component disposed on the support. The active metal component is one or more selected from the group consisting of Co, Fe, and Ru.

An electrically heating converter includes: a pillar shaped honeycomb structure made of conductive ceramics, including: an outer peripheral wall; and a partition wall disposed on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells, each of the cells penetrating from one end face to other end face to form a flow path; metal electrodes; a leaf spring provided on each of the metal electrodes; and a pressing member configured to press each of the leaf springs against the pillar shaped honeycomb structure, so that the pillar shaped honeycomb structure is electrically connected to each of the metal electrodes.

There is provided an exhaust gas purification device that shows a high HC removal performance under a condition in which a rich air-fuel mixture is introduced. The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end and a downstream end. The first catalyst layer is disposed on a surface of the partition wall in an upstream region including the upstream end of the substrate. The second catalyst layer is disposed inside the partition wall in a downstream region including the downstream end of the substrate. The first catalyst layer contains a first metal catalyst and alumina-zirconia composite oxide. The second catalyst layer contains a second metal catalyst.

There is provided an exhaust gas purification device that shows a high HC removal performance under a condition in which a rich air-fuel mixture is introduced. The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end and a downstream end. The first catalyst layer is disposed on a surface of the partition wall in an upstream region including the upstream end of the substrate. The second catalyst layer is disposed inside the partition wall in a downstream region including the downstream end of the substrate. The first catalyst layer contains a first metal catalyst and alumina-zirconia composite oxide. The second catalyst layer contains a second metal catalyst.

The present invention relates to a diesel oxidation catalyst comprising a carrier body having a length L extending between a first end face and a second end face, and differently composed material zones A and B arranged on the carrier body, wherein material zone A comprises platinum and palladium applied to a cerium-titanium mixed oxide, and material zone B comprises platinum and palladium applied to a carrier oxide B.

This invention provides an anisotropic nanostructure represented by the formula:
Ru.sub.xM.sub.1-x,
wherein 0.6≤x≤0.999, and M represents at least one member selected from the group consisting of Ir, Rh, Pt, Pd, and Au, and wherein Ru and M form a solid solution at the atomic level, and the anisotropic nanostructure has an anisotropic hexagonal close-packed structure (hcp).