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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Catalytic Oxidation of CO by N2O Enabled by Al2O2/3+: Temperature Dependent Kinetics and Statistical Modeling
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Catalytic Oxidation of CO by N2O Enabled by Al2O2/3+: Temperature Dependent Kinetics and Statistical Modeling

机译:AL2O2 / 3 +通过N2O催化氧化CO,+:温度依赖性动力学和统计建模

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The reactions of Al2O2+ + N2O and Al2O3+ + CO, forming a catalytic cycle oxidizing CO by N2O, have been investigated from 300 to 600 K in a variable ion source, temperature adjustable, selected-ion flow tube (VISTA-SIFT). Reaction coordinates have been calculated using density functional theory and statistical modeling of those surfaces compared to experimental kinetics data for mechanistic insight. The reaction of Al2O2+ + N2O proceeds at the Su-Chesnavich collisional limit at all temperatures studied, yielding only Al2O3+, with the exception of a small (<5%) amount of association product, Al2O2(N2O)(+) at 300 K. The reaction of Al2O3+ with CO produces Al2O2+ with a rate constant of 4.7 +/- 1.2 x 10(-10) cm(3) s(-1) at 300 K, decreasing with temperature as T-0.5 +/- 0.2. In addition, a significant amount of association product, Al2O3(CO)(+), was observed with rate constants for formation ranging from 10(-11) to 10(-10) cm(3) s(-1) dependent upon He buffer gas concentration and temperature. Implications of these kinetic measurements with regard to the reactive surface are discussed.
机译:在可变离子源,温度调节的选择离子流量管(Vista-Sift)中,已经研究了将催化循环氧化Co的Al 2 O 2 + + N 2 O和Al 2 O 3 + + Co的反应在300至600k中研究。与实验动力学数据进行了用于机械洞察的实验动力学数据,已经使用密度泛函理论和这些表面的统计建模计算了反应坐标。 Al 2 O 2 + + N 2 O的反应在研究的所有温度下在Su-Chesnavich碰撞极限上进行,除了Al 2 O 3 +,除了少量(<5%)的结合产物,Al 2 O 2(N 2 O)(+)在300k的情况下除外。 Al 2 O 3 +用CO的反应产生Al 2 O 2 +,速率常数为4.7 +/- 1.2×10(-10)cm(3)cm(3)克(3)厘米(3)厘米(3)厘米(3)厘米(-1),以温度降低为T-0.5 +/- 0.2。另外,用速率常数观察到大量的缔合产物,Al 2 O 3(CO)(+),其形成为10(-11)至10(-10)厘米(3)厘米(-1)依赖于他缓冲气体浓度和温度。讨论了这些动力学测量关于反应性表面的含义。

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