An apparatus includes an exhaust aftertreatment component. According to various embodiments, the exhaust aftertreatment component is any of a diesel oxidation catalyst, a diesel particulate filter, a decomposition reactor tube, a selective catalytic reduction device, and a reductant injector assembly. The apparatus also includes a ceramic thermal barrier coating applied to a surface of the exhaust aftertreatment component. The surface may, for example, be an outer wall of a housing of the exhaust aftertreatment component.

Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stability at high-reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica-to-alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.

The present disclosure provides a method of forming a selective catalytic reduction (SCR) catalyst, the method including receiving a first iron-promoted zeolite having a first iron content, and treating the iron-promoted zeolite with additional iron in an ion exchange step to form a second iron-promoted zeolite with a second iron content, the second iron content being higher than the first iron content. A selective catalytic reduction (SCR) catalyst composition including an ironpromoted zeolite having at least about 6 weight percent iron, based on total weight of the ironpromoted zeolite, wherein the iron content of the zeolite was added to the zeolite in at least two separate steps is also provided herein.

An exhaust gas treatment system for an internal combustion engine includes an exhaust gas pathway that receives exhaust gas from the engine, a temperature sensor configured to generate a temperature signal associated with a temperature of the exhaust gas at a position along the exhaust gas pathway, and a reductant source. The system also includes first and second injectors in fluid communication with the reductant source. The first and second injectors are configured to inject reductant into the exhaust gas pathway at first and second rates. The system also includes a first treatment element positioned downstream of the first injector and within the exhaust gas pathway, and a controller in communication with the temperature sensor. The controller is configured to receive the temperature signal from the temperature sensor and adjust at least one of the first rate or the second rate based at least in part on the temperature signal.

Disclosed in certain embodiments is a catalytic material comprising: an active precious metal component comprising platinum; a sulfur-tolerant support material comprising silica on zirconia; and a substrate having the catalytic material coated thereon.

This disclosure is directed to catalyst compositions, catalytic articles for purifying exhaust gas emissions and methods of making and using the same. In particular, the disclosure relates to a catalytic article including a catalytic material on a substrate, wherein the catalytic material has a first layer and a second layer. The first layer provides effective lean NO.sub.x trap functionality and the second layer provides effective three-way conversion of carbon monoxide, hydrocarbons, and nitrogen oxides (NO.sub.x).

The present disclosure provides an exhaust gas purification catalyst with increased exhaust gas purification performance. The exhaust gas purification catalyst has a porous support, catalyst metal particles supported in the pores of the porous support, and zirconium dioxide particles supported in the pores of the porous support. The zirconium dioxide particles are supported in a uniformly dispersed manner in the pores, as monoclinic crystals or a mixture of monoclinic crystals and tetragonal crystals, the phrase supported in a uniformly dispersed manner meaning that when the exhaust gas purification catalyst is measured with an electron beam microanalyzer, the proportion of the abundance ratio of zirconium in a surface region up to a depth of 1.5 m from the exhaust gas purification catalyst surface with respect to the abundance ratio of zirconium in the region inward from that surface region of the exhaust gas purification catalyst, is 95 to 105 mol %.

A gas treatment system includes a first scrubber configured to treat a gas exhausted from a process chamber, a catalytic reactor connected to the first scrubber and configured to treat a gas passing through the first scrubber, and a second scrubber connected to the catalytic reactor and configured to treat a gas passing through the catalytic reactor, where the catalytic reactor includes a fluidized bed reactor (FBR).

A passive NO.sub.X adsorbent includes: palladium, platinum or a mixture thereof and a mixed or composite oxide including the following elements in percentage by weight, expressed in terms of oxide: 10-90% by weight zirconium and 0.1-50% by weight of least one of the following: a transition metal or a lanthanide series element other than Ce. Although the passive NO.sub.X adsorbent can include Ce in an amount ranging from 0.1 to 20% by weight expressed in terms of oxide, advantages are obtained particularly in the case of low-Ce or a substantially Ce-free passive NOx adsorbent.

Provided is a method of manufacturing a nano-catalyst filter, which includes depositing through electrodeposition a catalyst precursor inside a porous filter to which an electrode layer is attached. Using this method, a nano-catalyst can be uniformly deposited inside a porous ceramic filter, and high catalyst efficiency can be obtained only using a small amount of the nano-catalyst.