H-ZSM-5 zeolite model crystals: Structure-diffusion-activity relationship in methanol-to-olefins catalysis

Pit Losch, Ana B. Pinar, Marc G. Willinger, Karel Soukup, Sachin Chavan, Bruno Vincent, Patrick Pale, Benoît Louis

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

96 Zitate (Scopus)

Abstract

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.

OriginalspracheEnglisch
Seiten (von - bis)11-23
Seitenumfang13
FachzeitschriftJournal of Catalysis
Jahrgang345
DOIs
PublikationsstatusVeröffentlicht - 1 Jan. 2017
Extern publiziertJa

Fingerprint

Untersuchen Sie die Forschungsthemen von „H-ZSM-5 zeolite model crystals: Structure-diffusion-activity relationship in methanol-to-olefins catalysis“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren