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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Thermochemistry of organic reactions in microporous oxides by atomistic simulations: Benchmarking against periodic B3LYP
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Thermochemistry of organic reactions in microporous oxides by atomistic simulations: Benchmarking against periodic B3LYP

机译:原子模拟模拟微孔氧化物中有机反应的热化学:定期B3LYP的基准

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摘要

The methylation of ethene by methyl chloride and methanol in the microporous materials SAPO-34 and SSZ-13 has been studied using different periodic atomistic modeling approaches based on density functional theory. The RPBE functional, which earlier has been used successfully in studies of surface reactions on metals, fails to yield a qualitatively correct description of the transition states under study. Employing B3LYP as functional gives results in line with experimental data: (1) Methanol is adsorbed more strongly than methyl chloride to the acid site. (2) The activation energies for the methylation of ethene are slightly lower for SSZ-13. Furthermore, the B3LYP activation energies are lower for methyl chloride than for methanol.
机译:使用不同的基于密度泛函理论的周期性原子建模方法研究了微孔材料SAPO-34和SSZ-13中乙烯在氯甲烷和甲醇中的甲基化反应。 RPBE官能团先前已成功用于金属表面反应的研究,但未能对所研究的过渡态做出定性的正确描述。使用B3LYP作为官能团得到的结果与实验数据相符:(1)甲醇比甲基氯更强地吸附到酸性部位。 (2)对于SSZ-13,乙烯甲基化的活化能略低。此外,氯甲烷的B3LYP活化能比甲醇低。

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