准确和高效的描述酸性热利石与平面波密度的功能理论使用范围分离的混合功能
Philipp Huber1, Philipp N Plessow1
1Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
准确的计算研究布伦斯特德酸性热石需要先进的方法超出了一般化梯度近似 (GGA). 距离分离的混合函数,如 ωB97M-D4,在周期密度函数理论 (DFT) 计算中为反应能量和障碍物提供了高精度.
科学领域:
- 计算化学是一种计算化学.
- 材料科学是一种材料科学.
- 催化剂是一种催化剂.
背景情况:
- 布伦斯特酸性热石是关键的催化剂,但它们的反应性很难准确地建模.
- 一般化梯度近似 (GGA) 密度函数理论 (DFT) 在反应障碍和碳酸稳定性方面经常产生重大错误.
- 高精度的ab initio方法通常仅限于较小的非周期性集群模型.
研究的目的:
- 为了评估各种密度函数和随机相近似 (RPA) 的性能,与高层 ab initio 基准进行对比.
- 确定准确和计算效率高的方法来研究热酸盐的反应性.
- 为了能够可靠地预测周期性热岩系统中的反应能量和障碍物.
主要方法:
- 密度函数 (包括范围分离的混合动力) 和RPA与DLPNO-CCSD (T) 和CBS推算的MP2计算进行比较.
- 使用大型集群模型进行参考计算.
- 在周期平面波DFT中应用选定的精确函数.
主要成果:
- 区间分离的混合函数,特别是 ωB97M-D4, ωB97M-V, ωB97X-D4, ωB97X-V和 ωB97-D,表现出高精度.
- 与参考计算相比,这些函数实现的平均绝对误差 (MAE) 低于8kJ/mol.
- ωB97M-D4的MAE为5.1kJ/mol,表现最好,甚至超过了CBS推算的MP2.
- 发现区间分离的函数在定期的DFT计算中表现良好.
结论:
- 距离分离的混合功能提供精确的反应能量和屏障,用于布伦斯特酸性热石.
- 这些方法可以在周期性热岩模型上进行高效和准确的直接计算.
- 这一进步有助于对石催化反应进行更可靠的计算研究.
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