Copper Oxide Clusters Stabilized by Ceria for CO, C3H6, and NO Abatement

A strong interaction between a metal oxide and support has long been indicative of its promotion of catalytic activities. In connection with this, we investigated the interaction of CuO with γ-Al2O3 and CeO2 for producing highly efficient catalysts for CO, C3H6, and NO abatement. In particular, the dispersion and thermal aging resistance of CuO clusters on different supports were studied. CuO clusters can be stabilized by interaction with CeO2, while on γ-Al2O3 they aggregated into larger particles at high CuO loadings. On the other hand, due to the poor thermal stability of CeO2, CuO clusters dispersed on it were sintered during an aging treatment at 950 °C. Accordingly, by pre-dispersing CeO2 on γ-Al2O3 followed by CuO dispersion, stabilized CuO clusters were obtained that were based on the superior aging resistance of the γ-Al2O3 support. Therefore, better catalytic performance and thermal aging properties were obtained with a CuO/CeO2/γ-Al2O3 catalyst as compared with CuO/γ-Al2O3 and CuO/CeO2 samples.

摘要以水合肼为还原剂, 采用硝酸 盐酸 硫酸及氮气或氢气氛处理的活性炭为催化剂, 考察了其催化硝基苯还原反应性能.结果表明, 经化学处理后, 活性炭表面形成了各种含氧官能团, 它们可引发水合肼分解, 并影响硝基苯的吸附. 活性炭表面形成的含氧官能团越多, 其催化硝基苯还原速率越快. 其中经盐酸处理的活性炭表面形成的含氧官能团最多, 因而表现出最高的硝基苯还原活性.

Graphical abstractBased on the surface interaction, CuO clusters are stable on CeO2 with the increasing loading, while CuO/Al2O3 has good thermal aging resistance. The CuO/CeO2/Al2O3 catalyst obtained by pre-dispersing CeO2 on Al2O3 had both superior dispersion and thermal stability.Figure optionsDownload full-size imageDownload as PowerPoint slide