H-ZSM-5 Zeolite Model Crystals: Structure-Diffusion-Activity Relationship in Methanol-to-Olefins Catalysis.

0469242 - ÚCHP 2017 RIV US eng J - Článek v odborném periodiku
Losch, P. - Pinar, A.B. - Willinger, M.G. - Soukup, Karel - Chavan, S. - Vincent, B. - Pale, P. - Louis, B.
H-ZSM-5 Zeolite Model Crystals: Structure-Diffusion-Activity Relationship in Methanol-to-Olefins Catalysis.
Journal of Catalysis. Roč. 345, JAN 1 (2017), s. 11-23. ISSN 0021-9517. E-ISSN 1090-2694
Grant ostatní: NRFL(LU) 5898454
Institucionální podpora: RVO:67985858
Klíčová slova: zeolite * methanol-to-olefins (MTO) * model catalyst
Obor OECD: Chemical process engineering
Impakt faktor: 6.759, rok: 2017

Large ZSM-5 zeolite crystals synthesized in fluoride medium show an astonishing activity, stability as well as selectivity towards light olefins in the Methanol-To-Olefins (MTO) reaction. By proper control of the synthesis parameters, ZSM-5 single crystals of unprecedented high quality are produced. The absence of usually uncontrollable variables such as structural defects, external non selective surface acid sites and extra-framework aluminium (EFAl) species was evidenced by SEM, HRTEM, CO-FTIR, 27Al and 19F MAS-NMR, Rietveld structure refinement and N2- and Ar-gas sorption measurements. Interestingly, diffusivity evaluation of different probe molecules (toluene, benzene and neopentane) has been carried out with PFG-NMR, allowing casting light on an interesting structure-diffusion-activity relationship. A levitation effect could be experimentally demonstrated and its impact on catalysis is highlighted in a rationalization attempt: Maxwell-Boltzmann based diffusion models properly predict product distributions for this counter-intuitively outstanding Methanol-To-Propylene (MTP) catalyst.
Trvalý link: http://hdl.handle.net/11104/0269444