Abstract
The sintering of Pd under high temperature operation conditions usually leads to serious deactivation of Pd-based TWCs. As the stronger Pd-CeO2-ZrO2(Pd-CZ) interaction in the form of Pd-O-Ce bond favors to anchor Pd species than that of Pd-Al2O3, to construct a CeO2-ZrO2-Al2O3(CZA) support with a relative CZ-rich surface is beneficial to selectively enlarger the Pd-CZ interface to maintain the excellent catalytic function of Pd/CZA TWCs. For the purpose, a facile one step peptizing method has been put forward to achieve the CZA material to stabilize Pd species. By XRD, TEM and Mapping, it could be inferred that comparing with the conventional precipitation method and peptization-precipitation method, the CZ nanoparticles could be homogeneously distributed on the network structure of porous Al2O3 by in-situ growth in the peptization method. Then the CZA with a relative CZ-rich surface could be obtained, which interacted strongly with the supported Pd species and thus stabilized the Pd species in oxidation states and smaller particle size. As a result, the Pd/CZA catalyst from peptization method exhibited the best activity for CO, NO, C3H6 and C3H8, the T90 (complete conversion temperature at 90% conversion) of which was reduced by 40 °C, 50 °C, 40 °C and 20 °C comparing with that of Pd/CZA derived from conventional precipitation method even being thermal aged at 900 ℃/3 h, respectively.
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