高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (6): 1235-1241.doi: 10.7503/cjcu20170811

• 物理化学 • 上一篇    下一篇

介孔SiO2包覆Ag/ZIF-8核壳型催化材料的合成

肖珊珊2, 欧阳逸挺2, 李小云1(), 王朝2, 吴攀2, 邓兆2(), 陈丽华2, 苏宝连2   

  1. 1. 武汉理工大学硅酸盐建筑材料国家重点实验室
    2. 材料复合新技术国家重点实验室, 武汉 430070
  • 收稿日期:2017-12-12 出版日期:2018-06-10 发布日期:2018-05-15
  • 基金资助:
    国家自然科学基金(批准号: 21301133)资助.

Synthesis of a Core-shell Structured Ag/ZIF-8 Catalyst with Mesoporous Silica Shell

XIAO Shanshan2, OUYANG Yiting2, LI Xiaoyun1,*(), WANG Zhao2, WU Pan2, DENG Zhao2,*(), CHEN Lihua2, SU Baolian2   

  1. 1. State Key Laboratory of Silicate Materials for Architectures
    2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2017-12-12 Online:2018-06-10 Published:2018-05-15
  • Contact: LI Xiaoyun,DENG Zhao E-mail:xiaoyunli2015@whut.edu.cn;dengzhao@whut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No. 21301133).

摘要:

通过液相自组装制备了Ag/ZIF-8; 进一步以十六烷基三甲基溴化铵(CTAB)为结构导向剂, 在疏水Ag/ZIF-8颗粒表面包覆一层介孔二氧化硅(MS)壳, 合成了具有核壳结构的Ag/ZIF-8@MS催化剂, 并对其进行了结构和性能表征. 结果表明, Ag/ZIF-8@MS具有均一的颗粒尺寸(Ag/ZIF-8@MS粒径约为100 nm, Ag粒径约为15 nm)、 较高的比表面积(539 m2/g)及较大的孔体积(0.64 m3/g); 透射电子显微镜表征结果表明, 介孔二氧化硅表层厚度约为20 nm. 于550 ℃煅烧后, 催化剂结构转变成Ag/ZnO@MS核壳结构. 以催化对硝基苯酚生成对氨基苯酚为模型反应, 对2种结构的Ag催化剂的催化性能进行了测试. 催化反应结果表明, 核壳型结构Ag/ZIF-8@MS材料催化对硝基苯酚反应的转化率超过95%, 证明了这种以ZIF-8为载体的核壳型材料的优势.

关键词: ZIF-8, 介孔二氧化硅, Ag纳米颗粒, 核壳型结构, 催化性能

Abstract:

The self-assembly technique was employed to sythesize the Ag nanoparticles on ZIF-8(Ag/ZIF-8). Cetyltrimethyl ammonium bromide(CTAB) was used as the structure-directing agent to facilitate mesoporous silica to coat on the surface of hydrophobic Ag/ZIF-8(Ag/ZIF-8@MS). The prepared Ag/ZIF-8@MS with a core-shell structure was characterized by a series of measurements. The results show that Ag/ZIF-8@MS has a uniform particle size(Ag/ZIF-8@MS: ca. 100 nm, Ag: ca. 15 nm), high specific surface area(539 m2/g) and large pore volume(0.64 m3/g). The TEM images indicate that the thickness of mesoporous silica shell is ca. 20 nm. The structure of catalyst is transformed into Ag/ZnO@MS core-shell structure after calcination at 550 ℃. Meanwhile, both of the Ag-baesd catalysts were tested for the reaction of 4-nitrophenol to prepare 4-aminophenol. The catalytic results showed that the conversion of 4-nitrophenol catalyzed by Ag/ZIF-8@MS was more than 95%, which proves the advantage of the core-shell structure with ZIF-8 as a carrier.

Key words: ZIF-8, Mesoporous silica, Silver nanoparticles, Core-shell, Catalytic performance

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