Abstract
As the two main components in typical three-way catalysts, Pd-Al2O3 and Pd-Ce0.5Zr0.5O2 usually show different Pd-support interaction strength. Thus, Pd could re-distribute between Al2O3 and Ce0.5Zr0.5O2 upon heating. Here the strategy to mix Pd/La-Al2O3 and Pd/Ce0.5Zr0.5O2 (before or after calcination, or after aging) was researched. The optimal choice was “mixing-calcination-aging”, offering the highest oxygen storage capacity, Pd dispersion and catalytic activity for CO and C3H6 elimination during the three-way catalytic reaction. Thus, the “mixing-calcination-aging” strategy holds promise in industrial applications, as demonstrated at the monolith converter level. The transient drop in conversion with increasing temperature (“kink”) appeared simultaneously for CO, NO and C3H6 over the “mixing-calcination-aging” monolith, but did not over the calcined counterpart “mixing-calcination”. The kinks disappeared for the used “mixing-calcination-aging”, but could be restored upon re-oxidizing. By virtue of the in situ Raman characterization, the reduction of PdO under the reaction conditions was found to cause the kinks.
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