摘要:
Cu-exchanged zeolite catalysts with a chabazite structure containing selected concentrations of alkali ions or alkaline-earth ions and a lower concentration of (Cu) ions are described and a sequential process for making. Catalysts of the present invention reduce light-off temperatures providing enhanced low-temperature conversion of NOx gases. Catalysts of the present invention also exhibit high selectivity values compared to conventional NOx reduction catalysts.
摘要:
A catalyst for NOx storage and reduction may include a carrier that contains alkali metal and Al, or alkali earth metal and Al, a NOx storage element of alkali metal, alkali earth metal or rare earth element, and one or more noble metals that are selected from the group consisting of Pt, Pd, Ru, Ag, Au and Rh. The catalyst for NOx storage and reduction shows excellent NOx storage and reduction capability, maintains excellent storage and reduction capability especially before and after deterioration and sulfation, and shows excellent catalytic activity under low temperature environment, while maintaining unusually high hydrophobicity.
摘要:
An exhaust gas after-treatment system for an internal combustion engine, with a particle filter arranged downstream of an internal combustion engine for filtering soot out of the exhaust gas, and with an oxidation catalytic converter arranged upstream of the particle filter and downstream of the internal combustion engine for the oxidation of SO2 into SO3. The SO3 and/or precipitated H2SO4 serves for the oxidation of soot in the particle filter and thus for the regeneration of the particle filter.
摘要翻译:一种用于内燃机的废气后处理系统,其具有布置在用于从排气中过滤烟灰的内燃机的下游的颗粒过滤器,以及布置在颗粒过滤器上游的氧化催化转化器并且在内部的下游 内燃机将SO2氧化成SO3。 SO 3和/或沉淀的H 2 SO 4用于在颗粒过滤器中氧化烟灰,并因此用于颗粒过滤器的再生。
摘要:
An exhaust system for an internal combustion engine is disclosed. The exhaust system comprises a particulate filter, one or more NOx reduction catalysts, and a low pressure exhaust gas recirculation (EGR) circuit for connecting the exhaust system downstream of the filter and the one or more NOx reduction catalysts to an intake of the engine. The EGR circuit comprises a N2O-producing catalyst.
摘要:
A ceramic article may comprise a sintered phase ceramic composition comprising aluminum titanate (Al2TiO5), zirconium titanate (ZrTiO4), and a niobium-doped phase.
摘要翻译:陶瓷制品可以包括包含钛酸铝(Al 2 TiO 5),钛酸锆(ZrTiO 4)和掺铌相的烧结相陶瓷组合物。
摘要:
The invention relates to a process for treating effluents (2) moving between the inlet (4) and outlet (5) of a reactor (1), the process consisting in treating the effluents by means of a cold plasma treatment and by means of a UV-photocatalytic agent in order to produce oxidizing species for treating the effluents.In accordance with the invention, the process consists in treating the effluents with a cold plasma treatment simultaneously with the action of a UV-photocatalytic agent, the cold plasma treatment being carried out in a manner that is integrated into and located within a bed of porous microbeads (9) placed inside the reactor (1) and carrying the photocatalytic agent in order to generate oxidizing species as well as to diffuse them within the bed.
摘要:
An exhaust system includes main line that runs through a three way converter (TWC) and then a lean NOx trap (LNT). The exhaust system further includes a bypass line configured to bypass the TWC. The LNT includes catalyst that is non-uniformly distributed along the longitudinal axis. The catalyst is distributed such that storage sites are weighted toward the upstream end of the LNT and oxidation and reduction sites are weighted toward the downstream end of the LNT.
摘要:
A method of preparing a catalyst composition suitable for removing sulfur from a catalytic reduction system and the catalyst composition prepared by the method are provided. The method of preparation of a catalyst composition, comprises: combining a metal oxide precursor, a catalyst metal precursor and an alkali metal precursor in the presence of a templating agent; hydrolyzing and condensing to form an intermediate product that comprises metal oxide, alkali metal oxide, and catalyst metal; and calcining to form a templated amorphous metal oxide substrate having a plurality of pores wherein the alkali metal oxide and catalyst metal are dispersed in an intermixed form in the metal oxide substrate.
摘要:
A method for oxidizing a carbonaceous material, the method comprising contacting the carbonaceous material with an effective amount of a catalytic material of formula AxMyWOz, and initiating the oxidization of the carbonaceous material at a first temperature lower than a second temperature at which the carbonaceous material is initiated to oxidize without a catalyst, wherein A is at least one of cesium and potassium, M is different from A and is at least one of cesium, potassium, magnesium, calcium, strontium, barium, iron, cobalt, nickel, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and bismuth, 0≦x≦1, 0≦y≦1, 2.2≦z≦3, when x=0, y>0, and when y=0, x>0.
摘要:
There is disclosed a microporous crystalline material having pore opening ranging from 3 to 5 Angstroms, where the material comprises a first metal chosen from alkali earth group, rare earth group, alkali group, or mixtures thereof, and a second metal chosen from iron, copper or mixtures thereof; and has a molar silica to alumina ratio (SAR) from 3 to 10. The microporous crystalline material disclosed herein may comprise a crystal structure having building units of double-6-rings (d6r) and pore opening of 8-rings as exemplified with framework types defined by the Structure Commission of the International Zeolite Association having structural codes of CHA, LEV, AEI, AFT, AFX, EAB, ERI, KFI, SAT, TSC, and SAV. There is also disclosed a method of selective catalytic reduction of nitrogen oxides in exhaust gas, comprising at least partially contacting the exhaust gases with an article comprising the disclosed microporous crystalline material.