γ-Al2O3在CeO2-La2O3催化还原SO2中的作用

考察了反应温度对γ-Al₂O₃、CeO₂-La₂O₃和CeO₂-La₂O₃/γ-Al₂O₃催化CO还原SO₂到单质硫活性的影响。采用XRD表征了催化剂反应前后的物相变化。结果表明，温度过低或过高均不利于γ-Al₂O₃催化CO还原SO₂的反应。γ-Al₂O₃的介入提高了CeO₂和La₂O₃的分散性，使Redox 和COS两种反应机理在同一催化剂上的协同作用增强，使CeO₂-La₂O₃/γ-Al₂O₃在催化还原SO₂的反应中具有更低的反应温度和更高的活性。

The function of γ-Al2O3 in catalytic reduction of SO2 to elemental sulfur over CeO2-La2O3 catalysts

The influences of reaction temperature on activity of γ-Al₂O₃, CeO₂-La₂O₃ and CeO₂-La₂O₃/γ-Al₂O₃ were investigated for the reduction of SO₂ to elemental sulfur by CO. The phase structure of γ-Al₂O₃, CeO₂-La₂O₃ and CeO₂-La₂O₃/γ-Al₂O₃ before and after reaction was characterized by XRD. The results showed that excessively low or high temperature would not favor reduction SO₂ to elemental sulfur over γ-Al₂O₃. Introduction of γ-Al₂O₃ enhanced the dispersity of CeO₂ and La₂O₃ and promoted the synergism between Redox reaction and COS intermediate reaction over CeO₂-La₂O₃/γ-Al₂O₃， resulting in lower reaction temperature and higher activity.