The present invention relates to a catalyst comprising at least one oxide of vanadium, at least one oxide of tungsten, at least one oxide of cerium, at least one oxide of titanium and at least one oxide of niobium, and an exhaust system containing said oxides.

The present invention relates to a catalyst comprising at least one oxide of vanadium, at least one oxide of tungsten, at least one oxide of cerium, at least one oxide of titanium and at least one oxide of niobium, and an exhaust system containing said oxides.

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 device (1) and a method for producing enameled wires, comprises an application device (3) for applying at least one enamel coating, a furnace (4) for solidifying the enamel coating and an exhaust gas purification device (7) for removing at least nitrogen oxides from an exhaust gas (9) of the furnace (4). The exhaust gas purification device (7) has a unit (13) for the selective catalytic reduction of nitrogen oxides in the exhaust gas (9) of the furnace and a feeding apparatus (11) for feeding a reducing agent, preferably an ammonia-containing compound, in particular a urea solution, into the exhaust gas (9) of the furnace (4). The feeding apparatus (11) has at least one outlet opening, which is designed in such a way that the reducing agent exits from the outlet opening substantially in the flow direction of the exhaust gas (9).

Methods and compositions related to a selective catalytic reduction catalyst comprising iron and vanadium, wherein the vanadium is present as (1) one or more vanadium oxides, and (2) metal vanadate of the form Fe.sub.xM.sub.yVO.sub.4 where x=0.2 to 1 and y=1−x, and where M comprises one or more non-Fe metals when y>0.

A method for regenerating a deNO.sub.x catalyst includes contacting the catalyst with steam at a temperature in the range of from 250 to 390° C. The method also includes reducing the amount of nitrogen oxide components in a process gas stream that includes a) contacting the process gas with a deNO.sub.x catalyst which results in the conversion of nitrogen oxide components as well as a decline in the NO.sub.x conversion over the deNO.sub.x catalyst; and b) regenerating the deNO.sub.x catalyst to improve the NO.sub.x conversion by contacting the deNO.sub.x catalyst with steam at a temperature in the range of from 250 to 390° C.

The disclosure is directed to an air purifier and an automobile air conditioner with an air purifier. The air purifier includes a reactor, a column, an air guider and a plurality of light emitting elements. The reactor includes an air inlet and an air outlet. The column is disposed in the reactor, and the column has a N-side walls. The air guider is disposed on the column, and the air guider is coated with a photocatalyst. The light emitting elements are placed on the N side walls of the column configured to irradiate on the photocatalyst, where each of the light emitting elements has an emitting angle of θ and θ*N>360°.

A method for preparing an active catalyst for high-efficiency denitration is disclosed. The method includes: a catalyst raw material is charged into a denitration reactor, NH.sub.3 and an inert gas are introduced and then heating is performed, and the temperature is held and then natural cooling is performed, thereby obtaining the catalyst. The active catalyst can greatly improve the denitration activity in low temperature range, and can not only improve the denitration efficiency under the condition without SO.sub.2 and H.sub.2O, but also can improve the denitration efficiency under the condition with both SO.sub.2 and H.sub.2O. The service life of the catalyst is prolonged under the premise of not changing the existing catalyst preparation process, and the economic benefit is significant. The denitration efficiency of a powder catalyst can be increased by 25%, and the denitration efficiency of a honeycombed catalyst or a corrugated catalyst can be increased by 20%.

The present disclosure is directed to an emission treatment system for NO.sub.x abatement in an exhaust stream of an ammonia-fueled engine, the emission treatment system including a selective catalytic reduction (SCR) catalyst disposed on a substrate in fluid communication with the exhaust stream, an oxidation catalyst disposed on a substrate positioned either upstream or downstream of the SCR catalyst and in fluid communication with the exhaust stream and the SCR catalyst, and optionally, one or more adsorption components disposed on a substrate positioned upstream and/or downstream of the SCR catalyst and in fluid communication with the exhaust stream and the SCR catalyst, the adsorption component chosen from low temperature NO.sub.x adsorbers (LT-NA), low temperature ammonia adsorbers (LT-AA), low temperature water vapor adsorbers (LT-WA), and combinations thereof. The disclosure further provides a related method of treatment of an exhaust gas.

A method of recovering catalyst performance includes providing a vanadium selective catalytic reduction (VSCR) catalyst. The method includes exposing the VSCR catalyst to a first humidity level in a range of 50%-100% relative humidity, at a first temperature in a range of 20° C.-100° C., for a first period of time of at least two hours. The method includes thermally treating the VSCR catalyst at a second temperature in a range of 300° C.-600° C. for a second period of time of at least than one hour.