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Article Dans Une Revue Journal of Physical Chemistry C Année : 2021

Atomic-Insight into Zeolite Catalyst Forming—an Advanced NMR Study

Louwanda Lakiss
Cassandre Kouvatas
Jean-Pierre Gilson
Svetlana Mintova
Robert Bedard
  • Fonction : Auteur
Suheil Abdo
  • Fonction : Auteur
Jeffery Bricker
  • Fonction : Auteur

Résumé

The main goal of this study is to understand, at the atomic level, the chemical interactions occurring between an active phase, a FAU zeolite in this case, and its binder during catalyst forming. This unit operation is a critical step in catalyst scale-up and commercialization but hasn't received the attention it deserves from academia. Herein, we present atomic-level insight in the solid-state chemistry taking place during the extrusion process by advanced NMR spectroscopy techniques (Indirect 27 Al{ 1 H}DNP MAS and 27 Al-{ 29 Si} J-HMQC). In particular, we: i) elucidate the chemical reactions taking place between atype Y FAU zeolite (Si/Al = 2.3) and abinder (pseudoboehmite), producing new active sites different than those present in either the zeolite or binder, ii) determine the location of these new active sites by a combination of DNP build-up time (TDNP)extracted from { 1 H}-27 Al saturation-recovery CP experiments and 2D heteronuclear 29 Si-27 Al NMR. This illustrates the power of advanced NMR techniques to elucidate the nature and location of newly created active sites during catalyst forming and provides insight into a key step to further fine-tune industrial catalysts.
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Dates et versions

hal-03423491 , version 1 (10-11-2021)

Identifiants

Citer

Louwanda Lakiss, Cassandre Kouvatas, Jean-Pierre Gilson, Valentin Valtchev, Svetlana Mintova, et al.. Atomic-Insight into Zeolite Catalyst Forming—an Advanced NMR Study. Journal of Physical Chemistry C, 2021, 125 (36), pp.20028-20034. ⟨10.1021/acs.jpcc.1c05501⟩. ⟨hal-03423491⟩
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