Phosphor-doped hexagonal boron nitride nanosheets as effective acid-base bifunctional catalysts for one-pot deacetalization-Knoevenagel cascade reactions
Phosphor-doped hexagonal boron nitride nanosheets as effective acid-base bifunctional catalysts for one-pot deacetalization-Knoevenagel cascade reactions
复制标题
磷掺杂六方氮化硼纳米片作为一锅脱缩醛化-Knoevenagel 级联反应的有效酸碱双功能催化剂
DOI：
10.1039/c8cy01821a
复制
发表时间：
2018
影响因子：
5
通讯作者：
Liu Hongyang
中科院分区：
文献类型：
--
作者：
Zhao J.;Lin B.;Zhu Y.;Zhou Y.;Liu Hongyang
由于具有过程强化以及消除废物和金属污染的优点，无金属多相双功能催化剂上的一锅级联反应在绿色化学中越来越受到关注。在本文中，磷掺杂六方氮化硼纳米片（BNP）可以作为优秀的无金属酸碱双功能催化剂，用于一锅脱缩醛化-Knoevenagel级联反应。 XRD、FT-IR、XPS 和固体 NMR 表征表明，磷主要在角位 (N2PO) 和拜耳 (N3P–OH) 位点掺杂到 h-BN 的骨架中。 CO2-TPD和NH3-TPD表征表明，具有最佳磷掺杂量的BNP样品同时具有最高数量的酸和碱位点。当与催化性能相关时，可以得出结论，主要是 N3P-OH 充当布朗斯台德酸位点，-BNH2 和 N2PO 分别充当路易斯和布朗斯台德碱位点。此外，良好的回收稳定性和在整体载体上的固定可行性证实了其在实际应用中的潜力。
One-pot cascade reactions over metal-free heterogeneous bifunctional catalysts have been attracting increased attention in green chemistry owing to the advantage of process intensification, as well as the elimination of wastes and metal contamination. In this paper, phosphor-doped hexagonal boron nitride nanosheets (BNP) can act as excellent metal-free acid–base bifunctional catalysts for one-pot deacetalization–Knoevenagel cascade reactions. XRD, FT-IR, XPS, and solid NMR characterizations indicate that phosphor was doped into the framework of h-BN mainly at the corner (N2PO) and bayer (N3P–OH) sites. The CO2-TPD and NH3-TPD characterizations showed that the BNP sample with optimal phosphor-doping amounts simultaneously possessed the highest amount of acid and base sites. When correlated with the catalytic performance, it can be concluded that mainly N3P–OH acts as the Brønsted acid sites and –BNH2 and N2PO as the Lewis and Brønsted base sites, respectively. In addition, the good recycling stability and immobilization feasibility on a monolith support confirm its potential in practical applications.