首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ab Initio Calculations of Carbonyl Adsorption Complexes at Zeolitic Bronsted Sites Simulated by Model Clusters: Role of Modeling
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Ab Initio Calculations of Carbonyl Adsorption Complexes at Zeolitic Bronsted Sites Simulated by Model Clusters: Role of Modeling

机译:由模型簇模拟的沸石布朗斯台德站点羰基吸附复合物的从头算计算:建模的作用

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摘要

Three different model clusters simulating the acid site in zeolites are employed to explore the stability of the hydrogen bonded absorption complex and silyl-ether addition compounds on adsorption of the carbonyls formaldehyde, acetaldehyde, and acetone at the Brousted acid site. Ab initio calculations are performed at the Hartree-Fock level and post-Hartree-Fock. Optimization along a reaction coordinate in the case of these carbonyls exhibits a competition between two stable structures, hydrogen bonded and addition complexes. The relative stabilities of these two complexes are shown to be very much dependent on the nature of the cluster model. Effects of basis set superposition error and correlation are also discussed.
机译:使用三种不同的模拟沸石中酸位点的模型簇来研究氢键结合的吸收配合物和甲硅烷基醚加成化合物在羰基甲醛,乙醛和丙酮在布鲁德酸位​​点上的吸附稳定性。从头算是在Hartree-Fock级别和Hartree-Fock之后进行的。在这些羰基化合物的情况下,沿着反应坐标的最优化表现出两个稳定结构之间的竞争,即氢键和加成络合物。这两个复合物的相对稳定性显示出非常依赖于群集模型的性质。还讨论了基集叠加误差和相关性的影响。

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