Supported heteropolyacids for NO_x storage and reduction

摘要

TiO_2 and SnO_2 were studied as possible supports for HPW in order to produce a new type of sorbent for NO_x trap applications.SnO_2 was synthesised by various inorganic methods while TiO_2 was purchased commercially.The sorption capacities and efficiencies depend upon the BET surfaces.Best performances were obtained with support with large pores where the crystalline structure of HPW is maintained.The optimal loading of HPW is ca.50% with BET surface in the range 20-80 m~2 g~(-1).