New mesoporous and well-structured Ag-based catalysts (xAg/ZrO2 and xAg/Fe–ZrO2 with x = 2 wt%) have been investigated in the total oxidation of toluene with water vapor. The results showed that the catalytic activity of systems increases, in the 350–550 °C temperature range, following this order: ZrO2 < Fe–ZrO2 < Ag/ZrO2 ≈ Ag/Fe–ZrO2. Nevertheless, it was revealed that Ag/Fe–ZrO2 is the most active solid for the low temperature total oxidation of toluene (< 350 °C). The highest low temperature activity of this new catalyst can be related to the presence of more reactive surface oxygen, new active redox and acidic sites at Ag/Fe–ZrO2 surface, most probably generated by the simultaneous presence of Ag and Fe species.

中文翻译：

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Ag/ZrO2和Ag/Fe-ZrO2催化剂在水蒸气存在下低温完全氧化甲苯

新型介孔和结构良好的银基催化剂（xAg/ZrO2 和 xAg/Fe-ZrO2，x = 2 wt%）已在甲苯与水蒸气的总氧化中进行了研究。结果表明，在 350-550 °C 的温度范围内，系统的催化活性按以下顺序增加：ZrO2 < Fe-ZrO2 < Ag/ZrO2 ≈ Ag/Fe-ZrO2。然而，结果表明，Ag/Fe-ZrO2 是甲苯低温全氧化（< 350 °C）中最活跃的固体。这种新催化剂的最高低温活性可能与更多活性表面氧、新活性氧化还原和 Ag/Fe-ZrO2 表面酸性位点的存在有关，这很可能是由 Ag 和 Fe 物种同时存在产生的。