| CeO2-La2O3/γ-Al2O3稀土氧化物混合物催化还原SO2的实验研究 |
| 摘要点击 1124 全文点击 1412 投稿时间：2003-05-23 修订日期：2003-08-13 |
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| 中文关键词 CeO2-La2O3/γ-Al2O3 混合物 催化还原 脱硫 |
| 英文关键词 CeO2-La2O3/γ-Al2O3 mixture catalytic reduction desulfurization |
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| 中文摘要 |
| 在La2O3 中加入变价稀土氧化物CeO2,组成一种稀土氧化物的混合物,以这种混合物作为CO还原SO2的催化剂.采用连续流动固定床反应器,在反应气体SO2和CO按SO2∶CO = 1∶3,载流气体为N2,气体流量为1000 mL/min的条件下,实验研究了该催化剂的活化过程以及温度和反应物浓度配比对活化反应的影响,用XRD和XPS对反应前后催化剂进行了表征,分析了相结构的变化.结果表明:CeO2和La2O3 2种稀土氧化物的混合物,在CO还原SO2的催化反应中,活化温度比单个的CeO2或La2O3氧化物下降了50℃～100℃,而且具有更高的活性.这可能是CeO2和La2O3氧化物之间存在着某种协同作用所致.
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| 英文摘要 |
| Addition of rare earth oxide CeO2 with variable valences to La2O3 formed a mixture of rare earth oxides. This mixture can be used as the catalyst for the reduction of SO2 by CO. In a fixed bed flow reactor, experimental were investigated for studing the activation process of this catalyst and effect factors such as temperature and concentration ratio of reactant on the activation reaction under the following conditions: composition of the gas mixture SO2∶CO=1∶3, balancing with N2 and feed flow rate 1000 mL/min. The phase structure changes of this catalyst were expressed with XRD and XPS. The results demonstrated that the activation temperature of CeO2 La2O3/γ-Al2O3 is 50～100℃ lower than that of a single component La2O3/γ-Al2O3 or CeO2/γ-Al2O3, and the mixture of rare earth oxides has higher activity on catalytic reduction of SO2 by CO. It's most likely that the result reveals on the synergism between CeO2 and La2O3. |
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