【摘要】 在固定床流动反应器中用程序升温反应（TPR）研究了SO₂对模拟柴油机排气中HC和CO在新鲜Pt催化剂和400℃硫化Pt催化剂作用下的催化氧化行为的影响。结果表明,反应气中的SO₂阻碍新鲜Pt催化剂对HC和CO的催化氧化,而硫化催化剂对C₃H₈的催化转化有促进作用。SO₂及其氧化产物SO₃在催化剂表面的化学吸附导致新鲜催化剂对HC和CO的催化性能下降,Pt催化剂和涂层载体γ-Al₂O₃界面的硫化物种在400℃下能够促进C₃H₈的催化氧化。更多还原

【Abstract】 The effect of SO₂ on the catalytic oxidation behavior of HC and CO in simulating diesel exhaust was studied over freshand 400℃ sulfated 2. 5g/L Pt/γ-Al₂O₃ using a fixed-bed flow reactor with temperature programmed reaction（TPR）. The resultsshowed that the inhibiting effect of SO₂ in the feed gas on the oxidation of HC and CO over fresh Pt/-Al₂O₃ as a result of SO₂ ad-sorbed species formed on the surface of catalyst; the promoting effect of SO₂ on conversion of C₃H₆ over sulfated Pt/γ-Al₂O₃ be-cause the SO₂ adsorbed species were oxidized to sulfate species on the Pt and γ-Al₂O₃ interface which strongly promote C₃H₈ oxi-dation. SO₂ in the automotive exhaust presents inhibiting effect over Pt catalytic converters at present, however. the results showedin this study tell us that SO₂ pretreatment at 400℃ might promote the C₃H₈ oxidation in the diesel exhaust.更多还原