[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

中文翻译：

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钼钒磷杂多酸催化的甲基丙烯醛好氧氧化：离子液体作为改性剂的关键作用

[EMIM]PAV [X] (X = Ac, NO 3 , BF 4 ) 使用咪唑类离子液体 ([EMIM][X], X = Ac, NO 3 , BF 4 ) 作为原料，通过简便的方法合成修饰试剂。FT-IR、XRD、SEM、TG/DTA、H 2 -TPR 和 XPS 表征表明 [EMIM]PAV [Ac] 具有均匀的棒状形态、更好的氧化还原性能和更高量的 NH 4 + 复合材料，因此在作为催化剂的甲基丙烯醛 (MAL) 氧化转化为甲基丙烯酸 (MAA) 中提供 98% 的高选择性。理论计算表明[EMIM][Ac]中C 2 -H相对强的氢键碱性对[EMIM]PAV [X]杂化物的结构和氧化还原性能有很大的积极影响。图形摘要