Molybdovanadophosphoric Heteropolyacid-Catalyzed Aerobic Oxidation of Methacrolein: The Crucial Role of Ionic Liquid as a Modifier

[EMIM]PAV [X] (X = Ac, NO 3 , BF 4 ) was synthesized by a facile method using imidazolium-based ionic liquids ([EMIM][X], X = Ac, NO 3 , BF 4 ) as the modifying reagent. Characterization by FT-IR, XRD, SEM, TG/DTA, H 2 -TPR and XPS demonstrated that [EMIM]PAV [Ac] has uniform rod-like morphology, be...

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Bibliographic Details
Published in:Catalysis letters 2020-06, Vol.150 (6), p.1774-1785
Main Authors: Cao, Yun-Li, Wang, Lei, Bai, Yin-Ge, Yan, Rui-Yi, Xu, Bao-Hua
Format: Article
Language:English
Subjects:
Basicity
Catalysis
Chemical tests and reagents
Chemistry
Chemistry and Materials Science
Hydrogen bonding
Industrial Chemistry/Chemical Engineering
Ionic liquids
Ions
Methacrylic acid
Morphology
Organometallic Chemistry
Oxidation
Physical Chemistry
Reagents
Selectivity
X ray photoelectron spectroscopy
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Summary:[EMIM]PAV [X] (X = Ac, NO 3 , BF 4 ) was synthesized by a facile method using imidazolium-based ionic liquids ([EMIM][X], X = Ac, NO 3 , BF 4 ) as the modifying reagent. Characterization by FT-IR, XRD, SEM, TG/DTA, H 2 -TPR and XPS demonstrated that [EMIM]PAV [Ac] has uniform rod-like morphology, better redox property and higher amount of NH 4 + composite, which therefore provides a high selectivity of 98% in the oxidative transformation of methacrolein (MAL) to methacrylic acid (MAA) as a catalyst. Theoretical calculations suggested the relatively strong H-bond basicity of C 2 −H in [EMIM][Ac] has a great positive influence on the structure and redox property of [EMIM]PAV [X] hybrids. Graphic Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-019-03063-4