Performance of NO sub(x storage-reduction catalyst in the temperature-reductant concentration domain by response surface methodology)

The performance trends of a homemade Pt-Ba/Al sub(2O) sub(3) monolith catalyst for NO sub(x storage and reduction at different temperatures and varying the hydrogen concentration fed during the regeneration period have been found by the response surface methodology. NO) sub(x) trapping efficiency during the lean period, selectivity to N sub(2/N) sub(2)O/NH sub(3 and global NSR efficiency have been used as the response for describing the performance of the monolith. Maximum NO) sub(x) trapping efficiency (80%) was found when operating at relative low temperature (240 [deg]C) and high reductant concentration (>2% H sub(2) but with limited selectivity to N) sub(2), whereas maximum selectivity to N sub(2 (above 90%) was achieved at high temperature (>300 [deg]C) and hydrogen in defect (