Abstract
To improve the performance of CeO2–ZrO2–Al2O3 (CZA) composite, Nd was introduced and the role of Nd was deeply investigated. The characterization results revealed that introduction of appropriate amount of Nd (4 wt %) can effectively modify the textural and structural properties of CZA, in this case, Nd selectively combines with CZ and hardly interacts with Al2O3, which could incorporate into the lattice of CZ to form ternary CeO2–ZrO2–Nd2O3 (CZN) solid solution, thus more lattice defects and improved oxygen mobility are obtained. However, excessive doping amount of Nd (6–8 wt %) brings about formation of Nd0.5Ce0.5O1.75 and phase separation of CZ especially after thermal aging treatment. The XPS results demonstrate that the supported catalyst Pd/CZAN4 possesses higher surface Pd and Ce3+ concentrations compared with Pd/CZA, which consequently leads to improved reducibility and catalytic performance. Furthermore, higher thermal stability is obtained, after aging treatment, Pd/CZAN4a still exhibits enhanced reduction property along with superior three-way catalytic performance.
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