Provided is a nitrogen oxide removing denitrification catalyst having high durability against sulfur dioxide, a preparing method of the same, and a method for removing nitrogen oxide using the same. The denitrification catalyst is a quaternary denitrification catalyst containing vanadium-molybdenum-antimony-titania used in a selective catalytic reduction (SCR) reaction using an ammonia reductant to remove nitrogen oxides included in exhaust gases, antimony, molybdenum and vanadium are carried on a titania carrier, and molybdenum and vanadium are combined to be present in a form of a complex oxide (V.sub.2MoO.sub.8).

A reactor for the decomposition of hydrocarbons includes: a structural catalyst for the decomposition of hydrocarbons having a structure in which a reaction gas may flow from one end to the other end when installed properly in a reaction chamber; and the heat source that is installed inside or outside the reaction chamber and capable of heating the structural catalyst for the decomposition of hydrocarbons. The structural catalyst for the decomposition of hydrocarbons has a shape encompassing a boundary wall surface or a boundary side that separates the structural catalyst for the decomposition of hydrocarbons from the heat source when viewed from a cross-section vertical to a direction of flowing a reaction gas, as well as the reaction furnace in which the reactor is embedded together with a catalyst module.

A reactor for the decomposition of hydrocarbons includes: a structural catalyst for the decomposition of hydrocarbons having a structure in which a reaction gas may flow from one end to the other end when installed properly in a reaction chamber; and the heat source that is installed inside or outside the reaction chamber and capable of heating the structural catalyst for the decomposition of hydrocarbons. The structural catalyst for the decomposition of hydrocarbons has a shape encompassing a boundary wall surface or a boundary side that separates the structural catalyst for the decomposition of hydrocarbons from the heat source when viewed from a cross-section vertical to a direction of flowing a reaction gas, as well as the reaction furnace in which the reactor is embedded together with a catalyst module.

A catalytic reactor (22) comprising a central axis (A) and a stack of catalytically active sheets (10), wherein the catalytically active sheets (10) are stacked in the axial direction. Each of the catalytically active sheets (10) comprises a central opening (17) and at least some of the catalytically active sheets (10) comprise an axially extending flange (18) arranged at least partially around said central opening (17), wherein the flange (18) of one catalytically active sheet (10) extends into the central opening (17) of an adjacent catalytically active sheet (10). Disclosed is also a method for providing a catalytic reaction.

A catalytic reactor (22) comprising a central axis (A) and a stack of catalytically active sheets (10), wherein the catalytically active sheets (10) are stacked in the axial direction. Each of the catalytically active sheets (10) comprises a central opening (17) and at least some of the catalytically active sheets (10) comprise an axially extending flange (18) arranged at least partially around said central opening (17), wherein the flange (18) of one catalytically active sheet (10) extends into the central opening (17) of an adjacent catalytically active sheet (10). Disclosed is also a method for providing a catalytic reaction.

The present invention provides a catalyst structure for oxidizing hydrogen in the air, comprising: a base and a catalyst layer, wherein the base comprises a first surface, the catalyst layer is disposed on the first surface of the base, and the catalyst layer comprises: a carbon carrier, multiple catalyst particles, and a fluorinated polymer; wherein the multiple catalyst particles are disposed on a surface of the carbon carrier, and the carbon carrier adheres to the first surface through the fluorinated polymer. The present invention further provides a device for oxidizing hydrogen, comprising: the catalyst structure and a shell, and the shell comprises an accommodation space, a first air flow part and a second air flow part in gas communication with each other; wherein the catalyst structure is disposed in the accommodation space and is between the first air flow part and the second air flow part.

The present invention provides a catalyst structure for oxidizing hydrogen in the air, comprising: a base and a catalyst layer, wherein the base comprises a first surface, the catalyst layer is disposed on the first surface of the base, and the catalyst layer comprises: a carbon carrier, multiple catalyst particles, and a fluorinated polymer; wherein the multiple catalyst particles are disposed on a surface of the carbon carrier, and the carbon carrier adheres to the first surface through the fluorinated polymer. The present invention further provides a device for oxidizing hydrogen, comprising: the catalyst structure and a shell, and the shell comprises an accommodation space, a first air flow part and a second air flow part in gas communication with each other; wherein the catalyst structure is disposed in the accommodation space and is between the first air flow part and the second air flow part.

The present invention relates to a catalyst for synthesizing multi-wall carbon nanotubes and, more specifically, to a catalyst for synthesizing multi-wall carbon nanotubes, capable of easily disperse the synthesized multi-wall carbon nanotubes and significantly improving conductivity, to a method for producing the catalyst, and to multi-wall carbon nanotubes synthesized by the catalyst.

A catalytic structure has a substrate and a plurality of high-entropy alloy (HEA) nanoparticles. At least a surface layer of the substrate is formed of a metal oxide. The HEA nanoparticles can be formed on the surface layer. Each HEA nanoparticle can comprise a homogeneous mixture of at least four different elements forming a single-phase solid-solution alloy. The catalytic structures can be used to catalyze a chemical reaction, such as an ammonia oxidation reaction, an ammonia synthesis reaction, or an ammonia decomposition reaction.

A catalytic structure has a substrate and a plurality of high-entropy alloy (HEA) nanoparticles. At least a surface layer of the substrate is formed of a metal oxide. The HEA nanoparticles can be formed on the surface layer. Each HEA nanoparticle can comprise a homogeneous mixture of at least four different elements forming a single-phase solid-solution alloy. The catalytic structures can be used to catalyze a chemical reaction, such as an ammonia oxidation reaction, an ammonia synthesis reaction, or an ammonia decomposition reaction.