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Enhancement of solid base activity for porous boron nitride catalysts by controlling active structure using post treatment
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.apcata.2020.117843
Atsushi Takagaki , Shohei Nakamura , Motonori Watanabe , Yoonyoung Kim , Jun Tae Song , Keiko Jimura , Kanta Yamada , Masaaki Yoshida , Shigenobu Hayashi , Tatsumi Ishihara

Porous boron nitride (BN) was synthesized using a pyrolysis method in conjunction with varying NH3 flow rates, followed by washing as a post-treatment. The performance of this material as a solid base catalyst was assessed. It was found that the post-treatment rather than the synthesis conditions significantly improved the activity of the BN during the nitroaldol reaction. The BN catalyst obtained after washing gave a ten times higher product yield. Both an increase in the surface areas of the material and the emergence of micropores after washing were observed. 11B solid-state nuclear magnetic resonance spectroscopy demonstrated that boron oxide species were present in the BN after synthesis but were removed by the washing process. B K-edge X-ray absorption fine structure analyses indicated the formation of oxygen-substituted trigonal boron sites on the BN surface. Fourier transform infrared spectroscopy showed that amino groups on the samples functioned as moderately strong basic sites.



中文翻译:

通过使用后处理控制活性结构,提高多孔氮化硼催化剂的固体碱活性

结合不同的NH 3流速,使用热解方法合成了多孔氮化硼(BN),然后进行洗涤作为后处理。评估了该材料作为固体碱催化剂的性能。发现在硝基醛醇反应过程中,后处理而不是合成条件显着提高了BN的活性。洗涤后获得的BN催化剂得到十倍高的产物产率。观察到材料表面积的增加和洗涤后微孔的出现。11B固态核磁共振波谱表明合成后BN中存在氧化硼物种,但通过洗涤过程将其去除。B K边缘X射线吸收精细结构分析表明BN表面上形成了氧取代的三角硼位。傅立叶变换红外光谱表明,样品上的氨基具有中等强度的碱性位点。

更新日期:2020-10-02
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