Al2O3-based passive NOx adsorbers for low temperature applications
作者： Yaying Ji , Shuli Bai , Mark Crocker
DOI: 10.1016/J.APCATB.2015.01.025
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摘要: Abstract NOx storage on Pt/Al2O3 and Pt/La-Al2O3 in the temperature range 80–160 °C was investigated by means of microreactor situ DRIFTS experiments, to ascertain their suitability for passive adsorber applications. Addition 1 wt% La Al2O3 resulted creation new sites improved efficiency. However, according TPD measurements, exhibited slightly lower desorption efficiency below 250 °C than Pt/Al2O3. During repeated adsorption–desorption cycles, almost no benefit addition observed after five due inability regenerate strong associated with at 250 °C. measurements indicated that during NOx-TPD, nitrites weakly bound nitrate species were initially removed from surface Pt/La-Al2O3. higher temperatures (>250 °C) mainly decomposition. revealed stored when oxidized Pt present, although a reductive re-treatment applied reduced became significant total improved. compared bare Al2O3, significantly dropped even pre-reduction H2. Overall, Pt-Al without showed highest amount
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