Investigation of the Brønsted acid sites in H-ZSM-5 model catalysts: How does Si/Al ratio affect acid strength and Al location?
Zeolites are widely used industrial heterogeneous aluminosilicate catalysts. Even though they are well studied, exact locations of active sites as well as acid strengths of individual sites remains elusive. ZSM-5 is one type of zeolites with orthorhombic Pnma unit cell and pore diameters of about 5.5 Å. The challenge in characterizing Al location and acid strength lies in the difficulty to distinguish between the Si and Al atoms in X-ray diffraction experiments. We have synthesized defect-free ZSM-5 samples with varying Al content. In catalysis, the varying Al content has large effects that have often been ascribed to variations in acid strengths or the spatial proximity of acid sites. In the proposed project we intend to investigate the location and strength of zeolitic acid sites by means of inelastic neutron scattering (INS) in the fundamental state. Furthermore it is planned to measure the samples at catalytically relevant conditions (T > 473 K) in order to characterize the T-dependent acid strengths as well as the proton's mobility. For this purpose quasi-elastic neutron scattering (QENS) is the adequate technique that we plan to use.
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SCHMIDT Wolfgang F; IVANOV Alexandre; JIMENEZ RUIZ Monica; JOSHI Hrishikesh; Pit Losch; OLLIVIER Jacques; VOZNIUK Olena and WEIDENTHALER Claudia. (2018). Investigation of the Brønsted acid sites in H-ZSM-5 model catalysts: How does Si/Al ratio affect acid strength and Al location?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-164
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