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Issue 22, 2018
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Phosphor-doped hexagonal boron nitride nanosheets as effective acid–base bifunctional catalysts for one-pot deacetalization–Knoevenagel cascade reactions

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Abstract

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 (N2P[double bond, length as m-dash]O) 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 N2P[double bond, length as m-dash]O 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.

Graphical abstract: Phosphor-doped hexagonal boron nitride nanosheets as effective acid–base bifunctional catalysts for one-pot deacetalization–Knoevenagel cascade reactions

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Publication details

The article was received on 30 Aug 2018, accepted on 10 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01821A
Citation: Catal. Sci. Technol., 2018,8, 5900-5905
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    Phosphor-doped hexagonal boron nitride nanosheets as effective acid–base bifunctional catalysts for one-pot deacetalization–Knoevenagel cascade reactions

    J. Zhao, B. Lin, Y. Zhu, Y. Zhou and H. Liu, Catal. Sci. Technol., 2018, 8, 5900
    DOI: 10.1039/C8CY01821A

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