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Kim, Kyung Duk
나노물질 및 화학반응 연구단
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Cascade reaction engineering on zirconia-supported mesoporous MFI zeolites with tunable Lewis-Bronsted acid sites: a case of the one-pot conversion of furfural to gamma-valerolactone

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Title
Cascade reaction engineering on zirconia-supported mesoporous MFI zeolites with tunable Lewis-Bronsted acid sites: a case of the one-pot conversion of furfural to gamma-valerolactone
Author(s)
Kyung Duk Kim; Jaeheon Kim; Wey Yang Teoh; Jeong Chul Kim; Jun Huang; Ryong Ryoo
Publication Date
2020-09
Journal
RSC ADVANCES, v.10, no.58, pp.35318 - 35328
Publisher
ROYAL SOC CHEMISTRY
Abstract
Catalytic cascade reactions are strongly desired as a potential means of combining multistep reactions into a single catalytic reactor. Appropriate catalysts composed of multi-reactive sites to catalyze cascade reactions in a sequential fashion are central to such efforts. Here, we demonstrate a bifunctional zeolite catalyst with close proximity of Bronsted and Lewis acid sites through the synthesis of a mesoporous ZrO2[Al]MFI nanosponge (NS). The unique mesopores of the MFI-NS allow the confinement of zirconium oxide clusters (Lewis acid sites, LA) within the few-unit-cell-thin MFI aluminosilicate zeolite wall (Bronsted acid sites, BA). Such a structure is clearly distinct from the conventional MFI zeolite, where the agglomeration of zirconium oxide clusters onto the external surface area within the crystal bulk is not possible, resulting in segregated BA and LA sites on the internal and external zeolite, respectively. By bringing the BA and LA within ZrO2[Al]MFI-NS 30, we uncovered a more efficient catalytic route for the conversion of furfural (100% within 2 h) to gamma-valerolactone (GVL) (83%). This route is only evident when the long molecular diffusion path, in the most extreme case of physically mixed ZrO2-(LA) and Al-zeolites (BA) (45% of GVL yield), is eliminated. Unlike the bifunctional ZrO2-Al-beta (GVL yield of 75%), where the BA concentration is greatly compromised at the expense of LA formation, we also show that the ZrO2[Al]MFI-NS is able to maintain a high density and good stability of both types of acids
URI
https://pr.ibs.re.kr/handle/8788114/9010
DOI
10.1039/d0ra06915a
ISSN
2046-2069
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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