A muffler includes a muffler housing having an exhaust gas inlet port adapted for securing to an exhaust pipe of an automobile so that exhaust gases from an internal combustion engine of the automobile are directed through the muffler housing from the exhaust gas inlet to an exhaust gas outlet. The muffler housing includes a plurality of rigid surfaces that form an exhaust gas pathway including a plurality of turns and lead from the exhaust gas inlet port to the exhaust gas outlet port. A photocatalyst coating is secured to an area of the rigid surfaces, and a light source is secured to the muffler housing and positioned to direct light onto the photocatalyst coating. The exhaust gases come into contact with the photocatalyst coating and reactive species generated by the photocatalyst coating decompose one or more pollutants in the exhaust gas.

Methods are disclosed for achieving the catalytic combustion of a gaseous species in low temperature humid environments. The methods comprise the steps of obtaining a combustion catalyst composition comprising an amount of a precious metal supported on an ion-exchangeable alkali metal titanate substrate, and then exposing the species to the combustion catalyst composition in the presence of an oxygen containing gas and water vapour at a catalysis temperature below 200° C. and at a relative humidity above 0.5%. A novel desiccant-coupled catalytic combustion process and system are also disclosed.

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; a first catalytic region comprising a first platinum group metal (PGM) component and a first PGM support material, wherein the first catalytic region comprises up to 5 wt. % Sn.

An air treatment unit (100) arranged for an intake of a first flow (110) of air into a space (120) in communication with the air treatment unit, and arranged for a discharge of a second flow (130) of air from the space. The air treatment unit comprises a heat-exchanging unit (140) arranged for thermal exchange between the second flow of air and the first flow of air, and a catalyst (150) configured to capture at least one impurity of the first flow of air. The catalyst is provided on at least a portion (160) of the heat-exchanging unit arranged to come into contact with the first flow of air during operation of the air treatment unit.

A supported catalyst for decomposing an organic substance that includes a support and a catalyst particle supported on the support. The catalyst particle contains a perovskite-type composite oxide represented by A.sub.xB.sub.yM.sub.zO.sub.w, where the A contains at least one selected from Ba and Sr, the B contains Zr, the M is at least one selected from Mn, Co, Ni and Fe, y+z=1, x0.995, z0.4, and w is a positive value satisfying electrical neutrality. A film thickness of a catalyst-supporting film supported on the support and containing the catalyst particle is 5 m or more, or a supported amount as determined by normalizing a mass of the catalyst particle supported on the support by a volume of the support is 45 g/L or more.

A nitrous oxide (N.sub.2O) removal catalyst composition for treating an exhaust stream of an internal combustion engine is provided, containing a platinum group metal (PGM) component on a metal oxide-based support, wherein the N.sub.2O removal catalyst composition is in a substantially reduced form, such that it has an oxygen deficiency of about 0.05 mmol oxygen atoms/g or greater, and wherein the N.sub.2O removal catalyst composition provides effective removal of at least a portion of N.sub.2O from the exhaust stream under lean conditions at a temperature of about 350 C. or lower. N.sub.2O removal catalytic articles, systems, and methods are also provided for removing at least a portion of N.sub.2O from an exhaust stream under lean, low temperature conditions.

Disclosed herein is a photocatalytic oxidation device that includes a frame and a pair of opposing photocatalytic cell panels. An ultraviolet lamp is disposed within an interior chamber and, when activated, causes the generation of oxidizers at the cell panels. Air is passable through apertures of the cell panels and thus may be moved through the device. The device is structurally configured and dimensionally optimized to provide effective photocatalytic activity without overly restricting airflow.

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 and *N>360.

A supported catalyst for decomposing an organic substance that includes a carrier and catalyst particles supported on the carrier. The catalyst particles contain a perovskite-type composite oxide represented by A.sub.xB.sub.yM.sub.zO.sub.w, where A contains at least one of Ba and Sr, B contains Zr, M is at least one of Mn, Co, Ni, and Fe, y+z=1, x>1, z<0.4, and w is a positive value that satisfies electrical neutrality. An organic substance decomposition rate after the supported catalyst is subjected to a heat treatment at 950 C. for 48 hours is greater than 0.97 when the organic substance decomposition rate before the heat treatment is regarded as 1, and an amount of the catalyst particles peeled off when the supported catalyst is ultrasonicated in water at 28 kHz and 220 W for 15 minutes is less than 1 wt % of the catalyst particles before untrasonication.

A catalyst for decomposing an organic substance, the catalyst having a body which has a plurality of pores and the body contains a perovskite-type composite oxide represented by A.sub.xB.sub.yM.sub.zO.sub.w, where the A contains at least one selected from Ba and Sr, the B contains Zr, the M is at least one selected from Mn, Co, Ni, and Fe, 1.001x1.1, 0.05z0.2, y+z=1, and w is a positive value that satisfies electrical neutrality. The average pore diameter of the plurality of pores is 49 nm to 260 nm and the pore volume of each of the plurality of pores is 0.08 cm.sup.3/g to 0.37 cm.sup.3/g.