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Periodic DFT investigation of the effect of aluminium content on the properties of the acid zeolite H-FER

机译:铝含量对酸沸石H-FER性质影响的定期DFT调查

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Periodic DFT calculations were performed on H-FER models having Si/Al ratios of 71:1, 35:1 and 8 :1, in order to investigate the effect of aluminium content on the properties of the zeolite Bransted acid sites. Relative stability of these sites was found to be dependent on Si/Al ratio, which is the main factor dictating the relative concentration of Bransted acid sites having different types of local configuration, to the point that some types of acid site are formed only when the aluminium content of the zeolite is relatively high. The number of AlO_4 tetrahedra sharing an oxygen with the SiO_4 tetrahedron involved in the Bransted acid site determines the Si-O(H)-Al angle, O-H stretching frequency and deprotonation energy (and hence acid strength). For Bransted acid protons not involved in intra-zeolite H-bonding, a correlation was found between Si-O(H)-Al angle and O-H stretching frequency.
机译:在具有71:1,35:1和8:1的具有Si / Al比率的H-FER模型上进行定期DFT计算,以研究铝含量对沸石杏仁酸位点的性质的影响。 发现这些位点的相对稳定性依赖于Si / Al比,这是对具有不同类型局部构型的勃朗酸位点的相对浓度的主要因素仅为仅当某些类型的酸部位时形成的 沸石的铝含量相对较高。 ALO_4 Tetrahedra与涉及的糖酸部位中涉及的SiO_4四面体分享氧的数量决定了Si-O(H)的角度,O-H拉伸频率和去质子能量(以及因此酸强度)。 对于未参与沸石内粘合的酥油酸质子,在Si-O(H)的角度和O-H拉伸频率之间存在相关性。

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    Department of Physical and Macromolecular Chemistry Faculty of Science Charles University in Prague Hlavova 2030 CZ-128 40 Prague 2 Czech Republic.;

    Departamento de Quimica Universidad de las Mas Baleares E-07122 Palma de Mallorca Spain.;

    Department of Physical and Macromolecular Chemistry Faculty of Science Charles University in Prague Hlavova 2030 CZ-128 40 Prague 2 Czech Republic.;

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  • 正文语种 eng
  • 中图分类 物理学;
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