摘要:
Method for the preparation of a catalysed monolithic body or a catalysed particulate filter by capillary suction of sol-solution containing catalytically active material and metal oxide catalyst carriers or precursors thereof into pores of monolithic substrate.
摘要翻译:通过将含有催化活性材料和金属氧化物催化剂载体或其前体的溶胶 - 溶液毛细管抽吸到单片基材的孔中来制备催化的整体或催化颗粒过滤器的方法。 p >
摘要:
Described is a catalyst comprising a washcoat including copper or iron on a small pore molecular sieve material having a maximum ring size of eight tetrahedral atoms physically mixed with platinum and rhodium on a refractory metal oxide support including alumina, silica, zirconia, titania, and physical mixtures or chemical combinations thereof, including atomically doped combinations. Also described is a catalyst comprising a first washcoat zone including copper or iron on a small pore molecular sieve material having a maximum ring size of eight tetrahedral atoms, the first washcoat zone being substantially free of platinum group metal; and a second washcoat zone including copper or iron on a small pore molecular sieve material having a maximum ring size of eight tetrahedral atoms physically mixed with platinum or platinum and rhodium on a refractory metal oxide support including alumina, silica, zirconia, titania, and physical mixtures or chemical combinations thereof, including atomically doped combinations. Methods and systems for treating emissions are also described.
摘要:
A diesel soot filter includes a substrate having a surface disposed at least partially within a fluid path of the diesel soot filter. A glass catalyst is disposed on the surface of the substrate such that an exhaust gas contacts at least a portion of a surface of the glass catalyst as the exhaust gas moves within the diesel soot filter. The glass catalyst comprises a plurality of alkali metal ions disposed within the glass catalyst and releasable to the surface of the glass catalyst at a controlled rate and the alkali metal ions combust with the soot as the exhaust gas travels along the fluid path. An oxide basis of the glass catalyst comprises Silicon (Si), Potassium (K), Cesium (Ce), and Zirconium (Zr).
摘要:
A nitrous oxide (N 2 O) removal catalyst composite is described, which includes: a N 2 O removal catalytic material on a carrier, wherein the catalytic material comprises a platinum group metal (PGM) component on a ceria-containing support having a single phase, cubic fluorite crystal structure. The catalytic material is effective to decompose nitrous oxide (N 2 O) to nitrogen (N 2 ) and oxygen (O 2 ) and/or to reduce N 2 O to N 2 and water (H 2 O) and/or (CO 2 ) under conditions of an exhaust stream of an internal combustion engine operating under conditions that are stoichiometric or lean with periodic rich transient excursions. Methods of making and using the same are also provided.
摘要:
A porous ceramic honeycomb body including a substrate of intersecting porous walls forming axial channels extending from a first end face to a second end face. An active portion of the walls include a zeolite catalyst disposed inside pores thereof and/or is comprised of an extruded zeolite and a three way catalyst (TWC) is disposed on wall surfaces of at least a portion of the active portion.
摘要:
The invention relates to a process for the preparation of a titania/metal vanadate based catalyst composition, comprising the steps of bringing into contact an amount of metatitanic acid which is sufficient to yield an amount of 60 wt.% to 99 wt.% of titania in the composition with an amount of one or more metal vanadates of the general formula Me Van (I) which is sufficient to yield an amount of 0.1 wt.% to 25 wt.% of Me Van in the composition, wherein Me denotes Mg, Ca, Sr, Ba, Zr, Mn, Fe, Cu, Ag, Al, Bi, Sb, Y, La, Ce, Pr, Nd, Sm, Gd, Tb,Dy, Er, Yb, or individual mixtures thereof, and Van denotes VO 4 3- , V 2 O 7 4- or mixtures thereof, to form an intimate mixture, and calcining the mixture obtained. The invention further relates to the use of metatitanic acid for the preparation of a titania/metal vanadate based catalyst in a one pot reaction.
摘要:
A lean burn engine exhaust treatment articles comprising a low temperature lean NO x trap (LT-LNT) composition and methods for their use is disclosed. A lean burn engine exhaust gas treatment system including the lean burn engine exhaust treatment articles is also disclosed. The low temperature lean NO x trap (LT-LNT) compositions can comprise a washcoat layer on a carrier substrate, the washcoat layer including a platinum group metal component impregnated on a first support material comprising at least 50% alumina. The washcoat layer may further include a low temperature NO x storage material comprising a bulk particulate reducible metal oxide. Methods of monitoring the aging state of a lean burn oxidation catalyst in a lean burn engine catalyst system are also disclosed.
摘要:
Die vorliegende Erfindung betrifft einen Katalysator zur Zersetzung von Lachgas sowie ein Verfahren zu seiner Herstellung und seine Verwendung. Der Katalysator enthält Rhodium auf einem Katalysatorträger, wobei der Katalysatorträger hergestellt ist durch Vermischen von Zirkoniumdioxidpulver mit einer Siliziumverbindung als Bindemittel und Wasser zu einer knetbaren Masse, Homogenisierung der Masse, Formung der Masse zu Formkörpern, Trocknung und Kalzinierung, wobei das Bindemittel ausgewählt ist aus Siliziumverbindungen mit den allgemeinen Formeln (I) bis (VI) (Hal)xSiR4-x(l) (Hal)xSi(OR')4-x(II) (Hal)xSi(NR R )a-x(III) RxSi(OR')4-x (IV) RxSi(NR R )4-x(V) (R O)xSi(NR R )4-x(VI) worin Hal unabhängig voneinander Halogen ( F, Cl, Br oder I), R unabhängig voneinander H oder einen gegebenenfalls substituierten Alkyl-, Alkenyl-, Alkinyl-, Cycloalkyl-, Cycloalkenyl-, Arylalkyl- oder Arylrest, R , R unabhängig voneinander H oder einen gegebenenfalls substituierten Alkyl-, Acyl-, Arylalkyl- oder Aryl rest, und x 0 bis 4 bedeuten.
摘要:
Variations of bulk powder catalyst material including Cu-Co, Fe-Co, and Co-Mn spinel systems for ZPGM TWC applications are disclosed. The disclosed bulk powder catalyst samples include stoichiometric and nonstoichiometric Cu-Co, Fe-Co, and Co-Mn spinels on Pr 6 O 11 -ZrO 2 support oxide, prepared using incipient wetness method. Activity measurements under isothermal steady state sweep test condition may he performed rich to lean condition. Catalytic activity of bulk powder samples may be compared to analyze the influence that different bimetallic spinel compositions may have on TVVC performance, including ZPGM materials for a plurality of TWC applications. Stoichiometric Cu-Co, Fe-Co, and Co-Mn spinel systems exhibit higher catalytic activity than non-stoichiometric Cu-Co, Fe-Co, and Co-Mn spinel systems. The influence of stoichiometric Cu-Co, Fe-Co, and Co-Mn spinel systems may lead into cost effective manufacturing solutions for ZPGM TWC systems.
摘要:
A catalyst composition comprising a mixture of (a) a zeolite compound in an amount of from 10% to 60% by weight, wherein the zeolite compound comprises cations selected from Fe 2+ , Fe 3+ , Cu + , Cu 2+ or mixtures thereof, and (b) a ceria/zirconia/alumina composite oxide, wherein the alumina content in said composite oxide is in the range of 20 to 80% by weight, in particular of 40 to 60% by weight, a catalyst comprising such catalyst composition and its use for exhaust gas after-treatment of diesel and lean burn engines.