Two-nozzle flame synthesis of Pt/Ba/Al{sub}2O{sub}3 for NO{sub}x storage

摘要

NO{sub}x storage-reduction (NSR) is applied for exhaust gas treatment of lean fuel engines The proximity between Pt and BaO in Pt/Ba/Al{sub}2O{sub}3 NSR catalysts affect the storage-reduction due the different spillover length the different interaction with the support. Here, we applied a two-nozzle flame synthesis way to control the location of the deposition of platinum with Pt either on the alumina support or on the Ba storage component. Differently deposited Pt were elucidated by electron microscopy techniques. NSR behavior of these catalysts was investigated in a microreactor by switching between lean and rich conditions. Our studies on the effect of the preferential deposition of platinum on the alumina support or Ba storage component corroborate that the remote control of the different constituents is a crucial factor for high performance of NSR catalysts. Flame synthesis based on a two-nozzle system was shown to be a suitable tool for controlling the proximity of storage and reduction components in NSR catalysts.