Mo Min, Xie Mingjiang, Guo Xiaojuan, Ding Weiping, Guo Xuefeng
Key Lab of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210093 China
Department of Educational Science, Hunan First Normal University Changsha 410205 China.
RSC Adv. 2019 Aug 23;9(45):26456-26463. doi: 10.1039/c9ra05540a. eCollection 2019 Aug 19.
A noncrystalline Ni-B alloy in the shape of nanotubes has demonstrated its superior catalytic performance for some hydrogenation reactions. Remarkable synergistic effects have been observed in many reactions when bimetallic catalysts were used; however, bimetallic noncrystalline alloy nanotubes are far less investigated. Here, we report a simple acetone-assisted lamellar liquid crystal approach for synthesizing a series of bimetallic Ni-Co-B nanotubes and investigate their catalytic performances. The dilution effect of acetone on liquid crystals was characterized by small-angle X-ray diffraction (SAXRD) and scanning electron microscopy (SEM). The Ni/Co molar ratio of the catalyst was varied to study the composition, porous structure, electronic interaction, and catalytic efficiency. In the liquid-phase hydrogenation of -chloronitrobenzene, the as-prepared noncrystalline alloy Ni-Co-B nanotubes exhibited higher catalytic activity and increased stability as compared to Ni-B and Co-B alloy nanotubes due to electronic interactions between the nickel and cobalt. The excellent hydrogenation performance of the Ni-Co-B nanotubes was attributed to their high specific surface area and the characteristic confinement effects, compared with Ni-Co-B nanoparticles.
一种纳米管形状的非晶态Ni-B合金已在一些氢化反应中展现出卓越的催化性能。使用双金属催化剂时，在许多反应中都观察到了显著的协同效应；然而，双金属非晶态合金纳米管的研究却少得多。在此，我们报道一种简单的丙酮辅助层状液晶法来合成一系列双金属Ni-Co-B纳米管，并研究它们的催化性能。通过小角X射线衍射（SAXRD）和扫描电子显微镜（SEM）对丙酮对液晶的稀释效应进行了表征。改变催化剂的Ni/Co摩尔比以研究其组成、多孔结构、电子相互作用和催化效率。在对氯硝基苯的液相加氢反应中，与Ni-B和Co-B合金纳米管相比，所制备的非晶态合金Ni-Co-B纳米管由于镍和钴之间的电子相互作用而表现出更高的催化活性和更高的稳定性。与Ni-Co-B纳米颗粒相比，Ni-Co-B纳米管优异的氢化性能归因于其高比表面积和独特的限域效应。
