Disclosed are an extruded honeycomb catalyst, a process for preparing the catalyst, a method for reducing NOx in the exhaust gas from an internal combustion engine by using the catalyst, and a method for treatment of the emission gas generated from power plant comprising exposing the emission gas to the catalyst.

A reactor for reducing the concentration of NO.sub.x in a stream comprising: an inlet for the stream; an outlet for a stream containing a reduced concentration of NO.sub.x; one or more catalyst beds comprising a ceramic or metallic foam with a NO.sub.x reduction catalyst; one or more flow paths from the inlet to the outlet that passes through at least one catalyst bed wherein the catalyst beds are closed at the top and bottom so that the flow path through the catalyst bed passes through the sides of the catalyst bed in a lateral flow is described.

A carbon dioxide purification system for the treatment of a waste gas produced by a generator includes a water removal unit having at least one drying device, and a purification unit having a plurality of pressure swing adsorption devices disposed and connected in series with each other. The at least one drying device is used to reduce water vapor in the waste gas and to form a dry gas mixture having carbon dioxide gas. The pressure swing adsorption devices are used to purify carbon dioxide gas from the dry gas mixture, so as to obtain a gas product containing carbon dioxide gas with a purity of more than 99.5%.

A micro coil includes a micro coil body having heat resistance sufficient to keep the micro coil body from thermal decomposition and melting in a high-temperature environment, and a coating layer that is provided on a surface of the micro coil body, and has heat resistance and electrical conductivity under the high-temperature environment and an oxidizing atmosphere. The coating layer has a shape that causes induced current to be produced according to a magnetic-field component of radio waves, when the micro coil receives the radio waves.

Disclosed are an extruded honeycomb catalyst, a process for preparing the catalyst, a method for reducing NOx in the exhaust gas from an internal combustion engine by using the catalyst, and a method for treatment of the emission gas generated from power plant comprising exposing the emission gas to the catalyst.

A composition including inorganic fibers having a surface area of at least 5 m.sup.2/g and an active agent incorporated into the inorganic fibers and/or applied onto at least a portion of the inorganic fibers. Products including the composition may include fiber aggregates, composite materials, filter elements, catalytic elements, exhaust gas treatment devices and other exhaust system components, and papers.

A photocatalyst includes a composite fiber having at least two crystalline semi-conductors that provide a heterojunction structure in the composite fiber.

A catalyst for treating fuel combustion exhaust, the catalyst comprising the following components: (i) an oxide support comprising silicon oxide, aluminum oxide, or combination of silicon and aluminum oxides; (ii) cerium oxide, zirconium oxide, or a combination of cerium and zirconium oxides in contact with said oxide support; and (iii) nanoparticles comprising elemental palladium or platinum in contact with at least component (ii), wherein said palladium or platinum is present in an amount of 0.1-4 wt. % by weight of the particles, and wherein surfaces of said nanoparticles of elemental palladium or palladium are exposed and accessible to said fuel combustion exhaust. Methods of producing and using the catalyst are also described.

A photocatalyst includes a composite fiber having at least two crystalline semi-conductors that provide a heterojunction structure in the composite fiber.

A composition including inorganic fibers having a surface area of at least 5 m.sup.2/g and an active agent incorporated into the inorganic fibers and/or applied onto at least a portion of the inorganic fibers. Products including the composition may include fiber aggregates, composite materials, filter elements, catalytic elements, exhaust gas treatment devices and other exhaust system components, and papers.