A series of Ni/C core-shell nano catalysts with abundant mesoporous and uniform size were prepared by Ni-MOF-74 pyrolysis. The Ni-MOF-74 was synthesized via hydrothermal method with nickel acetate and 2,5-dihydroxyterephthalic acid (DHTA) as raw materials. The pyrolysis process was carried out in a tube furnace under Argon (Ar) atmosphere with a heating rate of 2 degrees C/min. Completed pyrolytic product Ni/C can be obtained by extending the pyrolysis time (6 h) at 400. or increasing the pyrolysis temperature (>= 500 degrees C) based on the TG result. Moreover, the particle size of Ni/C varied with pyrolysis temperature from 3 nm (500 degrees C) to 17 nm (800 degrees C). The TEM images and Ar ion sputtering XPS indicated a core-shell structure of the pyrolysis product. Nickel species can be stable in the form of nickel (Ni-0) due to the electronic properties regulating and confinement effect of the carbon shell. Moreover, the carbon shell greatly weaken the interaction between particles, which is favorable for the dispersion of the catalyst in the reaction system. H-2-TPR results show that the interaction between nickel and amorphous carbon increases with the pyrolysis temperature, which is unfavorable to the interaction between Ni species and the reactant. The phenylacetylene (PA) hydrogenation reaction was carried out with 0.2 g catalyst, 10 mL of 1 mol/L ethanolic phenylacetylene solution and 1.0 MPa H-2 in a 50 mL high-pressure autoclave under 50 degrees C. Ni/C exhibits excellent catalytic activity and recyclability in phenylacetylene (PA) hydrogenation. In addition, we compared the activity of Ni/C with several reported catalyst system and found their activity increases in the order of Ni, NiSix, supported Ni2Si, Ni/C, Pd and Pt. With an activity of up to 0.833 mmol.min(-1).g(cat).(-1) at 50 degrees C (Ni/C-400-6, Ni/C-500-2), Ni/C is the most promising transition metal catalyst that can be comparable with noble metal.

中文翻译：

---

MOF热解制备Ni/C核壳纳米粒子用于苯乙炔加氢反应

通过Ni-MOF-74热解制备了一系列具有丰富介孔和均匀尺寸的Ni/C核壳纳米催化剂。以醋酸镍和2,5-二羟基对苯二甲酸（DHTA）为原料，通过水热法合成Ni-MOF-74。热解过程在管式炉中在氩气 (Ar) 气氛下以 2°C/min 的加热速率进行。根据TG结果，通过在400℃下延长热解时间（6 h）或提高热解温度（>= 500°C），可以获得完整的热解产物Ni/C。此外，Ni/C 的粒径随热解温度的变化而变化，从 3 nm（500 摄氏度）到 17 nm（800 摄氏度）。TEM 图像和 Ar 离子溅射 XPS 表明热解产物的核壳结构。由于碳壳的电子特性调节和限制作用，镍物种可以以镍 (Ni-0) 的形式稳定存在。而且，碳壳大大削弱了颗粒之间的相互作用，有利于催化剂在反应体系中的分散。H-2-TPR结果表明镍与无定形碳之间的相互作用随着热解温度的增加而增加，这不利于Ni物种与反应物之间的相互作用。苯乙炔 (PA) 加氢反应在 50 摄氏度、50 mL 高压釜中用 0.2 g 催化剂、10 mL 1 mol/L 苯乙炔乙醇溶液和 1.0 MPa H-2 进行。Ni/C 表现出优异的催化性能苯乙炔 (PA) 加氢的活性和可回收性。此外，我们将 Ni/C 的活性与几种报道的催化剂体系进行了比较，发现它们的活性按 Ni、NiSix、负载型 Ni2Si、Ni/C、Pd 和 Pt 的顺序增加。在 50 摄氏度（Ni/C-400-6、Ni/C-500-2）下，Ni/C 的活性高达 0.833 mmol.min(-1).g(cat).(-1)最有前途的过渡金属催化剂，可与贵金属相媲美。