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

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posted on 2021-09-07, 11:34 authored by Louwanda Lakiss, Cassandre Kouvatas, Jean-Pierre Gilson, Valentin Valtchev, Svetlana Mintova, Christian Fernandez, Robert Bedard, Suheil Abdo, Jeffery Bricker
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 has not received the attention it deserves from academia. Herein, we present atomic level insight into the solid-state chemistry taking place during the extrusion process by advanced NMR spectroscopy techniques (indirect 27Al­{1H}­DNP MAS and 27Al-{29Si} J-HMQC). In particular, we: (i) elucidate the chemical reactions taking place between a type Y FAU zeolite (Si/Al = 2.3) and a binder (pseudo-boehmite), producing new active sites different than those present in either the zeolite or binder and (ii) determine the location of these new active sites by a combination of DNP build-up time (TDNP) extracted from {1H}–27Al saturation-recovery cross polarization experiments and 2D heteronuclear 29Si–27Al 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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