Alumina supported 3 nm cerium dioxide nanoparticles (ceria NPs) have been found to efficiently catalyze the oxidation of carbon monoxide to carbon dioxide in the presence of excess oxygen. Complete conversion of CO to CO₂ was achieved in a 44.5 mL/min flow of 7739 ppm CO ± 2%, 41,500 ppm O₂ ±2%, and helium as balance at 400 °C with low catalyst loadings. The activity of unsupported ceria NPs was greatly reduced, presumably due to sintering. Supported 3 nm ceria NPs were also found to be much more active than commercially available ceria micro-powder. Without prior thermal activation, supported 3 nm ceria NPs were found to lower the light-off temperature for CO oxidation by 200 and 100 °C compared to inactivated and activated ceria micro-powders, respectively. The ease with which this catalyst can be prepared from commercially available resources and its high reactivity indicates that this material shows promise as a means of lowering CO emissions from automobiles without increasing precious metal loadings in catalytic converters.

已经发现，在过量氧气的存在下，氧化铝负载的3 nm二氧化铈纳米颗粒（氧化铈NPs）可以有效地催化一氧化碳氧化为二氧化碳。到CO的CO完全转化₂是在一个44.5毫升实现/ min流速7739 ppm的CO±2％，41,500 ppm的的O ₂±2％，氦气在400°C且催化剂负载低时达到平衡。推测是由于烧结，未支持的二氧化铈NPs的活性大大降低了。还发现支持的3 nm二氧化铈NPs比市售的二氧化铈微粉具有更高的活性。在没有事先热活化的情况下，与失活和活化的二氧化铈微粉相比，发现支持的3 nm氧化铈NP分别将CO氧化的起燃温度降低了200和100°C。这种催化剂可以很容易地从市售资源中制备，并且其高反应活性表明该材料显示出有望作为降低汽车中CO排放量而又不增加催化转化器中贵金属含量的一种手段。