摘要:
Die vorliegende Erfindung betrifft einen Dreiwegekatalysator, der sich insbesondere für die Entfernung von Kohlenmonoxid, Kohlenwasserstoffen und Stickoxiden aus dem Abgas von mit stöchiometrischem Luft/Kraftstoff-Gemisch betriebenen Verbrennungsmotoren eignet. Er ist dadurch gekennzeichnet, dass er eine hohe Sauerstoffspeicherfähigkeit nach Alterung aufweist und aus mindestens zwei katalytisch aktiven Schichten besteht.
摘要:
Die vorliegende Erfindung betrifft ein Partikelfilter, das ein Wandflussfilter der Länge L und zwei unterschiedliche katalytisch aktive Beschichtungen Y und Z umfasst, wobei das Wandflussfilter Kanäle E und A umfasst, die sich parallel zwischen einem ersten und einem zweiten Ende des Wandflussfilters erstrecken und die durch poröse Wände getrennt sind, die Oberflächen O E bzw. O A bilden und wobei die Kanäle E am zweiten Ende und die Kanäle A am ersten Ende verschlossen sind, dadurch gekennzeichnet, dass sich Beschichtung Y in den Kanälen E auf den Oberflächen O E und Beschichtung Z in den porösen Wänden befindet.
摘要:
A three-way catalyst composition, and its use in an exhaust system for internal combustion engines, is disclosed. The three-way catalyst composition comprises a compound of formula (I): A x-y A' y B 1 - z B' z O 3 ; wherein A is an ion of a metal of group 3 of the periodic table of elements; wherein A' is an ion of a metal of group 2 or 3 of the periodic table of elements; wherein B and B' are ions of metal of groups 7, 8, 9, 10, 11, or 13 of the periodic table of elements; wherein x is from 0.7 to 1; wherein y is from 0 to 0.5; wherein z is from 0 to 0.5; and wherein specific surface area of the compound of formula (I) is at least 20 m 2 /g.
摘要:
The present invention relates to porous nanoparticle catalysts. The catalytic material includes a plurality of composite nanoparticles comprising a support nanoparticle and a catalytic nanoparticle; a plurality of non-catalytic spacer nanoparticles; and a porous carrier that bridges together the plurality of composite nanoparticles and the plurality of spacer nanoparticles. The invention provides catalytic materials with very high catalytically active surface area, and methods of making and using the same. Applications include, but are not limited to, catalytic converters for treatment of automotive engine exhaust.
摘要:
Die vorliegende Erfindung betrifft eine Katalysatoranordnung, die a) einen Dreiwegekatalysator A auf einem Trägersubstrat T A b) einen Katalysator B auf einem Trägersubstrat T B , der zwei Materialzonen B1 und B2 umfasst, und/oder c) einen Katalysator C auf einem Trägersubstrat T C, der zwei Materialzonen C1 und C2 umfasst, umfasst.
摘要:
The invention relates to an at least partly stratified (such as at least partly dual stratified) charge combustion engine, especially CAI (combustion assisted ignition), HCC, HCSI and HCCI engine, in which the combustion of a hydrocarbon containing fuel generating a flame emitting photon is operated in a chamber with a wall provided with a cerium oxide - carbon containing coating, said coating further comprising at least comprising oxides of the followings elements Pr, Nd, La and at least Y and/or Zr. The engine of the invention enables a catalytic reduction of NOx exhaust rate.
摘要:
Methods for improving the stoichiometric catalytic conversion of zero-platinum group metals (ZPGM; platinum group metal free) catalyst materials including ternary spinel oxides are disclosed. The ZPGM catalyst materials comprise Cu-Mn-X ternary spinel oxides. The Cu-Mn-X ternary spinel oxides are produced by implementing a partial substitution within the B-site cation of a CuMn 2 04 spinel employing a general formulation CuMn 2-y X y 04, in which y is a variable representing different molar ratios and X is a cation that is not easily reducible. yis a number from 0.01 to 1.99. X is selected from the group consisting of nickel, titanium, aluminum, magnesium, cobalt, barium, lanthanum, cadmium, tin, yttrium, zirconium, and combinations thereof. The stoichiometry conversion of the ZPGM catalyst materials are improved by cation (X) doping, by calcining the ternary spinels at suitable temperatures, by varying the spinel loadings on support oxide, and by improving the oxygen storage capacity. Test results indicate that the ZPGM catalyst materials with improved stoichiometric conversion performance are obtained by improving concentration of Cu +1 , the purity of spinel phase, the loading and dispersion of the spinel, and improving the OSC of the spinel.
摘要:
The present disclosure describes rhodium iron catalysts of use in catalyst systems. Disclosed here are TWCs configured to include a substrate and one or more of a washcoat layer, an impregnation layer, and/or an overcoat layer. Disclosed herein are one or more of a washcoat layer and/or an overcoat layer formed using a slurry that includes one or more of an oxygen storage material, a refractory support oxide, iron, and rhodium. Disclosed herein are methods of preparing catalysts wherein a washcoat layer is deposited onto the substrate, one or more impregnation layers may be deposited onto the washcoat layer, one or more overcoat layers may be deposited onto the impregnation washcoat layer, and one or more additional impregnation layers may be deposited onto the one or more washcoat layers.
摘要:
Present disclosure provides a novel process for optimization of Zero-PGM catalyst systems using metallic substrate. Deposition of a homogeneous and well-adhered layer of catalyst on the metallic substrate may be enabled by the selection of a washcoat loading resulting from variation of metal loadings. Characterization of catalysts may be performed using a plurality of catalytic tests, including but not limited to washcoating adherence test, back pressure test, inspection of textural characteristics, and catalyst activity. Optimization may be applied to a plurality of metallic substrates of different geometries and cell densities.
摘要:
Process for manufacturing ZPGM catalysts systems that may allow the prevention of formation or the conversion of corrosion causing compounds, such as hexavalent chromium compounds, within ZPGM catalyst systems is disclosed. In one embodiment, disclosed ZPGM catalysts systems, may include metallic substrate, which may include alloys of iron and chromium, a washcoat and an overcoat. Disclosed manufacturing process may include a thermal decomposition of hexavalent chromium compounds which may allow the decomposition of such compounds into trivalent chromium compounds, and may also produce metallic catalyst, such as silver. Such conversion may prevent corrosion formation, such as red color corrosion within ZPGM catalyst system. An embodiment of the disclosed process may include a reducing agent, which may be present in exhaust conditions, which may convert hexavalent chromium compounds into trivalent chromium compounds as well as produce metallic catalyst, such as silver. Employing the disclosed manufacturing process may allow the production of ZPGM catalyst systems that may exhibit high activity and enhanced performance.