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The three-way catalytic converter

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Figure 24
Figure 24 Schematic comparison of the catalytic activity of (a) Rh/γ-Al2O3 and (b) [Rh/ZrO2]/γ-Al2O3 after thermal treatment at 1 100 °C in air for 1 h. The activity of the ZrO2-supported catalyst (b) remains virtually intact after the calcination, whereas that of the standard Rh/γ-Al2O3 catalyst (a) is seriously diminished.

 4.5.2 Thermal effects