摘要:
Oxidation ZPGM catalyst systems and three way ZPGM catalyst systems are disclosed. ZPGM catalyst systems may oxidize toxic gases, such as carbon monoxide and hydrocarbons, optionally some ZPGM catalyst systems may as well reduce nitrogen oxides that may be included in exhaust gases. ZPGM catalyst systems may include: a substrate, a washcoat, and an overcoat. The washcoat may include at least one ZPGM catalyst and carrier material oxides. Similarly, overcoat may include at least one ZPGM catalyst, carrier material oxides and OSMs. Suitable known in the art chemical techniques, deposition methods and treatment systems may be employed in order to form the disclosed ZPGM catalyst systems.
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:
Variations of ZPGM bulk powder catalyst materials, including Cu-Co-Mn ternary spinel systems for TWC applications are disclosed. Bulk powder catalyst samples are prepared employing a plurality of molar ratio variations, including disclosed Cu-Co-Mn spinel on Praseodymium-Zirconia support oxide made by incipient wetness method, or Cu-Co-Mn spinel on Niobium-Zirconia support oxide, which may be synthesized by co-precipitation method. A plurality of bulk powder catalyst samples may be tested by performing isothermal steady state sweep test, employing a flow reactor at inlet temperature of about 450 ºC, and testing a gas stream from lean to rich condition and influence on TWC performance measured/analyzed, which may lead into significant improvements in the manufacturing of ZPGM bulk powder catalyst materials for TWC applications.
摘要:
Effect of the type of ZPGM material composition to improve thermal stability of ZPGM catalyst systems for TWC application is disclosed. ZPGM catalyst system samples are prepared and configured with washcoat on ceramic substrate, overcoat including doped Zirconia support oxide, and impregnation layer including either Cu 1 Mn 2 O 4 spinel or Cu 1 Co 1 Mn 1 O 4 spinel. Testing of ZPGM catalyst samples including variations of aging temperatures and different impregnation layer materials are developed under isothermal steady state sweep test condition for ZPGM catalyst systems to evaluate performance especially NOx conversions and level of thermal stability. As a result disclosed ZPGM catalyst systems with most suitable spinel that includes Cu 1 Co 1 Mn 1 O 4 in impregnation layer exhibit high NOx conversion and significant improved thermal stability compare to Cu 1 Mn 2 O 4 spinel, which is suitable for under floor and close coupled TWC application. The effect of adding Co to Cu-Mn spinel composition to improve thermal stability confirmed by TPR measurement.