Abstract:
Provided are multi-zone catalyst articles, methods of manufacturing multi-zone catalyst articles, and methods for controlling emissions in diesel engine exhaust streams with multi-zone catalyst articles, where the emission treatment system of various embodiments effectively treats diesel engine exhaust with a single multi-zone catalyst article.
Abstract:
The object of the present invention is to provide a high-performance exhaust gas purifying catalyst that can achieve oxygen absorption/release capacity and NOx purification performance. The object is solved by an exhaust gas purifying catalyst, which comprises a ceria-zirconia composite oxide having a pyrochlore-type ordered array structure in the upstream part of the catalyst coating layer, in which the ceria-zirconia composite oxide contains at least one additional element selected from the group consisting of praseodymium, lanthanum, and yttrium at 0.5 to 5.0 mol % of the total cation amount, and has a molar ratio of (cerium + the additional element) : (zirconium) of 43 : 57 to 48 : 52.
Abstract:
The object of the present invention is to provide an exhaust gas purifying catalyst that can achieve high purification performance while suppressing H 2 S emissions. The object is solved by an exhaust gas purifying catalyst in which the lower layer of the catalyst coating layer comprises a ceria-zirconia composite oxide having a pyrochlore-type ordered array structure, in which the ceria-zirconia composite oxide contains at least one additional element selected from the group consisting of praseodymium, lanthanum, and yttrium at 0.5 to 5.0 mol% in relation to the total cation amount, and the molar ratio of (cerium + additional element) : (zirconium) is within the range from 43 : 57 to 48 : 52.
Abstract:
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.
Abstract:
Uses are disclosed for a new crystalline molecular sieve designated SSZ-102 synthesized using an N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication as a structure directing agent. SSZ-102 has ESV framework topology.
Abstract:
Provided are processes for the production of particles of catalytic material for emissions control obtainable in one-step from flame spray pyrolysis of precursor-containing dispersion(s), the method comprising: (1) providing a dispersion comprising one or more disperse phases and a continuous phase, the dispersion comprising: (a) a precursor compound of a first platinum group metal and a precursor compound of a first support, and (b) a precursor compound of a second platinum group metal and a precursor compound of a second support, wherein (a) is in a first phase that is different from a second phase containing (b); (2) forming an aerosol of the dispersion provided in step (1); and (3) pyrolyzing the aerosol of step (2) to obtain the particles of catalytic material. The catalytic particles comprise more than one support material and more than one platinum group metal, for use as, for example, three-way conversion (TWC) catalysts.