MOF热解法制备Ni/C核壳材料及其催化苯乙炔加氢性能研究

doi:10.6023/A17070339

化学学报 ›› 2018, Vol. 76 ›› Issue (1): 22-29.DOI: 10.6023/A17070339 上一篇下一篇

研究论文

MOF热解法制备Ni/C核壳材料及其催化苯乙炔加氢性能研究

郭小玲^a,b, 陈霄^a, 苏党生^b, 梁长海^a

a 大连理工大学化工学院先进材料与催化工程实验室大连 116024;
b 中国科学院金属研究所沈阳材料科学国家(联合)实验室催化材料研究部沈阳 110016

投稿日期:2017-07-26 发布日期:2017-10-24
通讯作者: 梁长海 E-mail:changhai@dlut.edu.cn
基金资助:
国家自然科学基金（Nos.21373038，21403026），辽宁省自然科学基金-沈阳材料科学国家（联合）实验室联合开放基金（No.2015021014）和中央高校基本科研业务费专项资金（No.DUT16RC（4）03）的资助项目.

Preparation of Ni/C Core-shell Nanoparticles through MOF Pyrolysis for Phenylacetylene Hydrogenation Reaction

Guo Xiaoling^a,b, Chen Xiao^a, Su Dangsheng^b, Liang Changhai^a

a Laboratory of Advanced Materials and Catalytic Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024;
b Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received:2017-07-26 Published:2017-10-24
Contact: 10.6023/A17070339 E-mail:changhai@dlut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21373038, 21403026), the Natural Science Foundation of Liaoning Province in China (No. 2015021014), and the Fundamental Research Funds for the Central Universities (No. DUT16RC(4)03).

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1. MOF热解法制备Ni/C核壳材料及其催化苯乙炔加氢性能研究.PDF(307KB)

摘要/Abstract

通过水热合成法以硝酸镍和2，5-二羟基对苯二甲酸为原料成功合成Ni-MOF-74.以此为前体，在Ar气氛下热解制备了一系列介孔结构丰富、尺寸均匀的纳米Ni/C核壳催化剂.Ar气氛下通过延长热解时间（400℃，6 h）或提高热解温度（≥500℃）可以得到完全热解产物，粒子尺寸随热解温度的升高而增大.H₂-TPR结果表明随着热解温度的提高，镍与表面碳层之间的相互作用增强，材料还原性能降低.TEM和Ar离子溅射XPS给出了Ni/C纳米材料为核壳结构的直接证据.由于表面碳层的化学惰性，隔离作用和电子调控作用，使得部分镍物种能够以单质镍（Ni⁰）形式稳定存在.其次，表面碳壳的存在减弱了颗粒间的相互作用，有利于催化剂在反应体系中均匀分散.以苯乙炔选择加氢反应为探针，在高压釜式反应器中测试Ni/C的催化性能.研究发现Ni/C在苯乙炔加氢反应中表现出了非常优异的催化活性（0.833 mmol•min^-1•g_cat.^-1）和稳定性.其与几种催化剂的加氢活性由弱到强的顺序为：Ni < NiSi_x < 负载型Ni₂Si < Ni/C < Pd < Pt.

关键词: MOF热解, Ni/C纳米材料, 核壳结构, 多相催化, 苯乙炔加氢

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℃/min. Completed pyrolytic product Ni/C can be obtained by extending the pyrolysis time (6 h) at 400℃ or increasing the pyrolysis temperature (≥ 500℃) based on the TG result. Moreover, the particle size of Ni/C varied with pyrolysis temperature from 3 nm (500℃) to 17 nm (800℃). 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 (Ni⁰) 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. H₂-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 H₂ in a 50 mL high-pressure autoclave under 50℃. 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, NiSi_x, supported Ni₂Si, Ni/C, Pd and Pt. With an activity of up to 0.833 mmol•min^-1•g_cat.^-1 at 50℃ (Ni/C-400-6, Ni/C-500-2), Ni/C is the most promising transition metal catalyst that can be comparable with noble metal.

Key words: MOFs pyrolysis, Ni/C nano-material, core-shell structure, heterogeneous catalysis, phenylacetylene hydrogenation

引用此文

郭小玲, 陈霄, 苏党生, 梁长海. MOF热解法制备Ni/C核壳材料及其催化苯乙炔加氢性能研究[J]. 化学学报, 2018, 76(1): 22-29.

Guo Xiaoling, Chen Xiao, Su Dangsheng, Liang Changhai. Preparation of Ni/C Core-shell Nanoparticles through MOF Pyrolysis for Phenylacetylene Hydrogenation Reaction[J]. Acta Chim. Sinica, 2018, 76(1): 22-29.

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MOF热解法制备Ni/C核壳材料及其催化苯乙炔加氢性能研究

Preparation of Ni/C Core-shell Nanoparticles through MOF Pyrolysis for Phenylacetylene Hydrogenation Reaction

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