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Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

机译:钙钛矿晶格氧有助于废气净化的低温催化

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A Pd catalyst supported on Ba-substituted LaAlO _(3) perovskite (Pd/La _(0.9) Ba _(0.1) AlO _(3? δ ) ) was investigated for NO reduction at low temperature by propylene, which revealed that Pd/La _(0.9) Ba _(0.1) AlO _(3? δ ) has remarkably higher activity than other Pd catalysts at low temperatures (≤573 K) for NO reduction by propylene. To elucidate the surface reaction pathway, transient response tests were conducted using ~(18) O _(2) . Also, X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements were conducted. Comparison with a Ba-impregnated catalyst (Pd/Ba/LaAlO _(3) ) demonstrated that Pd/La _(0.9) Ba _(0.1) AlO _(3? δ ) shows higher activity for the formation of oxygenated species (C _(x) H _(y) O _(z) ) as an intermediate for NO reduction because the surface lattice oxygen has improved mobility via Ba ~(2+) substitution in LaAlO _(3) . Therefore, Pd/La _(0.9) Ba _(0.1) AlO _(3? δ ) have high activity for NO reduction, even at low temperatures in a humid condition.
机译:研究了负载在Ba取代的LaAlO_(3)钙钛矿(Pd / La _(0.9)Ba _(0.1)AlO _(3δδ)上的Pd催化剂在低温下通过丙烯还原NO的情况,结果表明Pd / La _(0.9)Ba _(0.1)AlO _(3?δ)在低温下(≤573K)具有比其他Pd催化剂高得多的活性,可用于丙烯的NO还原。为了阐明表面反应途径,使用〜(18)O _(2)进行了瞬态响应测试。此外,还进行了X射线光电子能谱(XPS)和漫反射红外傅里叶变换光谱(DRIFTS)的测量。与浸有Ba的催化剂(Pd / Ba / LaAlO _(3))的比较表明,Pd / La _(0.9)Ba _(0.1)AlO _(3Δδ)对形成含氧物质(C _(x)H _(y)O _(z))作为NO还原的中间体,因为表面晶格氧通过LaAlO_(3)中的Ba〜(2+)取代提高了迁移率。因此,即使在潮湿条件下的低温下,Pd / La _(0.9)Ba _(0.1)AlO _(3δ)也具有高的NO还原活性。

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