...
首页> 外文期刊>Catalysis science & technology >Implications of coverage-dependent O adsorption for catalytic NO oxidation on the late transition metals
【24h】

Implications of coverage-dependent O adsorption for catalytic NO oxidation on the late transition metals

机译:覆盖范围依赖性O吸附对催化无氧化对晚期过渡金属的含义

获取原文
获取原文并翻译 | 示例
           

摘要

Adsorbate interactions affect both the energies and arrangements of adsorbates on surfaces and consequently influence rates of surface chemical reactions. Here we examine these effects for a rate-limiting O-2 dissociation model of catalytic NO oxidation on the late transition metals. We report periodic density functional theory calculations of atomic oxygen adsorption on the (0001) facets of Ru, Os, and Co, and the (111) facets of Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au and correlate these results using cluster expansion (CE) representations. We use grand canonical Monte Carlo simulations implementing these CE Hamiltonians to determine both the number and energetics of first-nearest-neighbor binding site vacancies available for the dissociative adsorption of O-2 at conditions representative of catalytic NO oxidation. We estimate steady-state turnover frequencies and compare results to predictions using non-interacting adsorbates. We show that coverage dependence manifests itself in both the energetics and statistical availability of reaction sites and causes rates to deviate substantially from the coverage-independent limit.
机译:吸附物相互作用会影响吸附物在表面上的能量和排列,从而影响表面化学反应的速率。在这里,我们检查了这些效果,以限制催化性无氧化的O-2 O-2解离模型对晚期过渡金属的氧化。我们报告了RU,OS和CO的(0001)方面的原子氧吸附的定期密度功能理论计算以及RH,IR,IR,Ni,Ni,Pd,Pt,Pt,Cu,Ag,Au和Au and Aus and Corelate的Rh,111)片段这些结果使用群集扩展(CE)表示。我们使用实施这些CE Hamiltonians的大典型蒙特卡洛模拟来确定在代表催化NO氧化的条件下,可用于O-2的解离吸附的第一名最邻居结合位点空缺的数量和能量。我们估计稳态周转频率,并将结果与​​使用非相互作用的吸附物进行比较。我们表明,覆盖范围依赖性在反应位点的能量和统计上都表现出来,并导致速率显着偏离覆盖范围独立的极限。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号