Effects of ball-milling treatment on physicochemical properties and solid base activity of hexagonal boron nitrides

Shoichiro Namba, Atsushi Takagaki, Keiko Jimura, Shigenobu Hayashi, Ryuji Kikuchi, S. Ted Oyama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hexagonal boron nitride (h-BN) was ball-milled at various rotation speeds (150-600 rpm) using a planetary ball-mill. Ball-milling disrupted the layered structure of the h-BN, resulting in significant increases of surface area. Ball-milling at 400 rpm gave the highest surface area of 412 m 2 g -1 while higher rotation speeds decreased the surface areas due to agglomeration. Moreover, ball-milling resulted in the emergence of amino- and hydroxyl groups on the surface which were observed by Fourier transform infrared spectroscopy, and 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 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 40 °C whereas pristine h-BN showed no activity. The base sites were mainly responsible for the catalytic activity.

Original languageEnglish
Pages (from-to)302-309
Number of pages8
JournalCatalysis Science and Technology
Volume9
Issue number2
DOIs
Publication statusPublished - Jan 1 2019

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Boron nitride
Ball milling
Boron
Catalyst activity
Fructose
Magic angle spinning
Ball mills
Hydroxyl Radical
Nuclear magnetic resonance spectroscopy
Reaction rates
Fourier transform infrared spectroscopy
Glucose
boron nitride
Agglomeration
X ray photoelectron spectroscopy
Oxidation

All Science Journal Classification (ASJC) codes

  • Catalysis

Cite this

Effects of ball-milling treatment on physicochemical properties and solid base activity of hexagonal boron nitrides. / Namba, Shoichiro; Takagaki, Atsushi; Jimura, Keiko; Hayashi, Shigenobu; Kikuchi, Ryuji; Ted Oyama, S.

In: Catalysis Science and Technology, Vol. 9, No. 2, 01.01.2019, p. 302-309.

Research output: Contribution to journalArticle

Namba, Shoichiro ; Takagaki, Atsushi ; Jimura, Keiko ; Hayashi, Shigenobu ; Kikuchi, Ryuji ; Ted Oyama, S. / Effects of ball-milling treatment on physicochemical properties and solid base activity of hexagonal boron nitrides. In: Catalysis Science and Technology. 2019 ; Vol. 9, No. 2. pp. 302-309.
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