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首页> 外文期刊>Kinetics and catalysis >Thermal Deactivation Mechanism and the Effect of Nd Addition on the Deactivation of the Pt/SiO2 Catalyst for NO Oxidation Reaction
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Thermal Deactivation Mechanism and the Effect of Nd Addition on the Deactivation of the Pt/SiO2 Catalyst for NO Oxidation Reaction

机译：热失活机理及ND加法对不氧化反应的Pt / SiO2催化剂去激活的影响

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摘要

Pt-based catalysts cannot be used permanently for the diesel after-treatment system because the catalytic activity is decreased due to coarsening of Pt particles at high temperature of the exhaust gas. In this study, to prevent Pt-based catalyst from deactivation, Nd was added to the Pt/SiO2 catalyst, and the effect of the Nd addition on the catalytic activity was investigated. The Pt/SiO2 catalyst showed a high catalytic activity for the oxidation of NO but was severely deactivated after the fast thermal aging process. Pt crystallite size was increased and some Pt particles were buried in the SiO2 pore during the fast thermal aging process, which led to the decrease of catalytic activity. Nd-added Pt/SiO2 catalyst showed lower activity than Pt/SiO2 catalyst, but Pt-Nd/SiO2 catalyst maintained its catalytic activity after fast thermal aging process. It can be postulated that a stable Nd silicate, on which Pt particle is placed, protects SiO2 pores from destruction and so the number of the catalytically active sites remains nearly unchanged. As a result the Pt-Nd/SiO2 catalyst maintained its catalytic activity after fast thermal aging process.
机译：Pt基催化剂不能永久地用于柴油后处理系统，因为由于在废气的高温下Pt颗粒粗化而降低催化活性。在该研究中，为了防止Pt基催化剂从去激活，将Nd加入到Pt / SiO 2催化剂中，并研究了Nd加入对催化活性的影响。 Pt / SiO 2催化剂显示出高催化活性的氧化，但在快速热老化过程之后严重失活。 Pt微晶尺寸增加，在快速热老化过程中，将一些Pt颗粒埋入SiO 2孔中，这导致催化活性的降低。 ND加入的Pt / SiO 2催化剂显示出比Pt / SiO 2催化剂更低的活性，但Pt-Nd / SiO 2催化剂在快速热老化过程后保持其催化活性。它可以假设稳定的Nd硅酸盐，在其中放置Pt颗粒，保护SiO 2孔免受破坏，因此催化活性位点的数量几乎保持不变。结果，PT-Nd / SiO 2催化剂在快速热老化过程后保持其催化活性。

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