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摘要

A series of transition metal Mn, Cu, Ce and Fe were loaded on TiO2 by sol-gel method with noble metal Pd as promotor for the application of passive NOx adsorber (PNA). Experiment on adsorption and desorption of NOx were conducted and characterization method such as XRD, XPS and in situ DRIFTS were involved. The experimental results show that Mn contained catalysts, Mn-Ti and Pd-Mn-Ti, performed excellent NOx adsorb ability and appropriate desorption temperature window. On the other hand, Ce and Cu contained samples were not suitable for the purpose of PNA. In addition to the low adsorption capacity, these two series of catalysts released massive amount of NO below 150 ℃. Characterization results indicated that Pd was highly dispersed in all catalysts. The loading of Pd lowered not only the valence states of transition metals but surface oxygen percentage as well. From in situ DRIFTS tests, the Pd had little influence on the types of adsorbed substances for Mn, Ce and Cu series. However, the storage forms of NOx were obviously different on Pd-Fe-Ti and Fe-Ti.

关键词

Passive NOx adsorber; Low temperature; Manganese; Pd-Fe interaction

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