Table 1.

The results of TPR measurements of 20 wt.% MO₂/Al₂O₃ catalysts (M = Mn, Ce or Zr).

Catalyst	H2/MO2 Molar Ratio in TPR
MnO2 1	0.98
MnO2/Al2O3	1.04
MnO2/Al2O3 2	0.03
CeO2 3	0.11
CeO2/Al2O3	0.26
CeO2/Al2O3 2	0.03
ZrO2 4	~0.0

¹ Pure MnO₂; ² spent catalyst; ³ pure CeO₂; ⁴ pure ZrO₂.