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Effects of Ball-milling Treatment on Physicochemical Properties and Solid Base Activity of Hexagonal Boron Nitrides

Abstract

Hexagonal boron nitride (h-BN) was ball-milled at various rotation speeds (150-600 rpm) using a planetary ball-mill. The ball-milling disrupted the layered structure of the h-BN, resulting in significant increases of surface area. The ball-milling at 400 rpm gave the highest surface area of 412 m2 g-1 while higher rotation speeds decreased the surface areas due to agglomeration. Moreover, the ball-milling resulted in the emergence of amino- and hydroxyl groups on the surface which were observed by Fourier transform infrared spectroscopy, and the partial oxidation of the surface boron by the formation of B-OH groups was confirmed by X-ray photoelectron spectroscopy. The appearance of trigonal B-O and tetrahedral B-O was observed by boron-11 magic-angle spinning nuclear magnetic resonance spectroscopy. The number of base sites was increased with the increase of rotation speeds of the milling, corresponding to the formation of amino groups. The ball-milled h-BN showed catalytic activity for the nitroaldol reaction between nitromethane and benzaldehyde in which the h-BN milled at 400 rpm exhibited the highest reaction rate and turnover frequency. In addition, the ball-milled h-BN could convert glucose with the formation of fructose at 40oC whereas pristine h-BN showed no activity. The base sites were mainly responsible for the catalytic activity.

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Publication details

The article was received on 10 May 2018, accepted on 08 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8CY00940F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Effects of Ball-milling Treatment on Physicochemical Properties and Solid Base Activity of Hexagonal Boron Nitrides

    S. Namba, A. Takagaki, K. Jimura, S. Hayashi, R. Kikuchi and S. T. Oyama, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00940F

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