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中文摘要：
采用浸渍法在γ-Al2O3载体上分步负载改性剂Mn2O3和活性组分CuO,制备了一系列不同配比的CuO/Mn2O3/γ-Al2O3催化剂,并运用CO＋O2模型反应、XRF、XRD、H2-TPR、in-situ FTIR等手段表征了催化剂的活性和物理化学性质。活性测试结果表明,锰氧化物对γ-Al2O3载体的改性能有效地提高CuO/γ-Al2O3催化剂在CO＋O2模型反应中的催化活性。XRD结果表明,锰氧化物对γ-Al2O3载体的改性可以促进氧化铜在载体表面的分散,从而提高了分散态氧化铜的含量,不过这与活性变化的趋势并不完全一致。进一步结合H2-TPR、in-situ FTIR表征结果 ,我们发现,分散态铜、锰氧化物的还原性质也是影响其催化活性的重要因素,催化剂中分散态铜、锰物种越容易被还原,其对CO＋O2模型反应的催化活性就越高。
英文摘要：
A series CuO/Mn2O3/γ-Al2O3 catalysts were prepared by impregnation and characterized by XRF,XRD,H2-TPR,in-situ FT-IR and activity test for oxidation of carbon monoxide.The model reaction of CO＋O2 tests showed that,modification of γ-Al2O3 by Mn2O3 promoted activities of CuO/γ-Al2O3 catalysts.XRD results proved that the amount of well-dispersed Cu2＋ species was increased after the modification by Mn2O3,and it was also found that the catalytic activities were not only decided by the amount of well-dispersed Cu2＋ species.Furthermore,TPR and in-situ FT-IR results revealed that the activities of catalysts were in good line with the reducibility of well-dispersed copper and manganese oxides species.
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