摘要:
An oxidation catalyst is disclosed, which contains Ce and Ga, and a Ce—Ga composite oxide containing a solid solution in which a part of Ce is substituted with Ga. This oxidation catalyst is obtained in such a manner that pH of a mixed solution obtained by mixing a Ce-containing solution and a Ga-containing solution together is adjusted, and a precipitate obtained by coprecipitating Ce and Ga is dried and baked.
摘要:
Provided are emissions treatment systems for an exhaust stream having an ammonia-generating component, such as a NOx storage reduction (NSR) catalyst or a lean NOx trap (LNT) catalyst, and an SCR catalyst disposed downstream of the ammonia-generating catalyst. The SCR catalyst can be a molecular sieve having the CHA crystal structure, for example SSZ-13 or SAPO-34, which can be ion-exchanged with copper. The LNT can be layered, having an undercoat washcoat layer comprising a support material, at least one precious metal, and at least one NOx sorbent selected from the group consisting of alkaline earth elements, rare earth elements, and combinations thereof and a top washcoat layer comprising a support material, at least one precious metal, and ceria in particulate form, the top washcoat layer being substantially free of alkaline earth components. The emissions treatment system is advantageously used for the treatment of exhaust streams from diesel engines and lean burn gasoline engines.
摘要:
The present invention discloses a method of removing sulfur oxides and/or nitrogen oxides in a regeneration flue gas emitted from a regenerator of a catalytic cracking plant and recovering the elemental sulfur and an apparatus therefor.
摘要:
The present invention relates to compositions based on zirconium oxide and cerium oxide that exhibit a sufficiently high specific surface area after calcination and a low maximum reduction temperature of the oxide after calcination. Compositions of the present invention may be notably used in various catalytic systems, such as for the treatment of exhaust gases from internal combustion engines.
摘要:
Disclosure relates to a slip catalyst for reducing NO2 content in an exhaust train of an internal combustion engine flowed through by an exhaust gas flow, which has an oxidizing catalyst for the formation of NO2 and a particulate filter arranged downstream for binding carbon black particles and simultaneous and/or subsequent reaction of the same with NO2 formed on the oxidizing catalyst, having a substrate that is provided with a coating, which coating reduces a proportion of NO2 in the exhaust gas flow flowing through. The coating has at least two elements from the group of rare-earth metals, which are present in the coating in the form of a salt or an oxide or in an elementary form and in a concentration of more than 300.0 g/m3.
摘要翻译:公开涉及一种用于减少由排气流动的内燃机的排气系列中的NO 2含量的滑动催化剂,其具有用于形成NO 2的氧化催化剂和布置在下游用于结合炭黑颗粒的颗粒过滤器以及同时 和/或随后与氧化催化剂上形成的NO 2的反应,其具有设置有涂层的基材,该涂层减少流过的废气流中的NO 2的比例。 该涂层具有至少两种来自稀土金属的元素,它们以盐或氧化物形式存在于涂层中,或以基本形式存在,浓度大于300.0g / m 3。
摘要:
A diesel oxidation catalyst (DOC) system for the treatment of exhaust gas emissions, including oxidation of nitrogen oxides (NO), unburned hydrocarbons (HC), and carbon monoxide (CO) is disclosed. Fresh and hydrothermally aged Zero-PGM (ZPGM) DOC samples are prepared and configured with an alumina-based washcoat on ceramic substrate, overcoat including doped Zirconia support oxide, and impregnation layer of Cu—Mn spinel of selected base metal loadings. Testing of fresh and hydrothermally aged ZPGM DOC system samples including Cu—Mn spinel is developed to evaluate the performance of Cu—Mn spinel active phase in oxidation CO, HC, and NO, as well as production of NO2. Key to improvement in light-off performance and NO oxidation is to have a diesel oxidation catalyst that is substantially PGM-free and available for a plurality of applications in lean burn engine operations.
摘要:
The present invention relates to the separation and capture of carbon-containing compounds from gases. Specifically, the present invention relates to the use of rare-earth based compounds for the capture and separation of carbon-containing compounds from gases. The carbon capture processes can be integrated into fossil fuel power generation plants or other industrial process plants in order to reduce emission of greenhouse gases from the plants.
摘要:
The present invention relates to a catalytically effective composition for a multilayer catalyst for exhaust gas after-treatment of combustion facilities and to a multilayer catalyst containing the catalytically effective composition. Moreover, the invention relates to an exhaust gas after-treatment system and to a vehicle which both contain the catalyst according to the invention.
摘要:
The invention relates to a composition containing zirconium, cerium and yttrium oxides with a cerium oxide proportion of between 3% and 15%, and yttrium oxide proportions corresponding to the following conditions: 6% at most if the cerium oxide proportion is between 12% excluded and 15% included; 10% at most if the cerium oxide proportion is between 7% excluded and 12% included; 30% at most if the cerium oxide proportion is between 3% and 7% included; the balance consisting of zirconium oxide. The composition may optionally include an oxide of a rare earth selected from lanthanum, neodymium and praseodymium. The composition can be used for processing the exhaust gases of a vehicle.
摘要:
Disclosed are three-way catalysts that are able to simultaneously convert nitrogen oxides, carbon monoxide, and hydrocarbons in exhaust gas emissions into less toxic compounds. Also disclosed are three-way catalyst formulations comprising palladium (Pd)-containing oxygen storage materials. In some embodiments, the three-way catalyst formulations of the invention do not contain rhodium. Further disclosed are improved methods for making Pd-containing oxygen storage materials. The relates to methods of making and using three-way catalyst formulations of the invention.