Morphology Control and Catalytic Dehydrogenation Performance of Zeolitic Imidazolate Frameworks⁃8

doi:10.19894/j.issn.1000-0518.210214

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (7): 1065-1072.DOI: 10.19894/j.issn.1000-0518.210214

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Morphology Control and Catalytic Dehydrogenation Performance of Zeolitic Imidazolate Frameworks⁃8

Wang LI()

Taiyuan University of Science and Technology，Taiyuan 030024，China

Received:2021-04-30 Accepted:2021-08-20 Published:2022-07-01 Online:2022-07-11
Contact: Wang LI
About author:2019014@tyust.edu.cn
Supported by:
Shanxi Excellent Doctor Foundation(20202003);the Science and Technology Innovation Project of Higher Education Institutions of Shanxi Province(20201023);the College Students' Innovative Entrepreneurial Training Plan Program(2020348);the Doctor Initiated Fund Project(20192025)

Abstract

Abstract:

Zeolitic imidazolate frameworks?8 （ZIF?8） is a kind of porous material with large specific surface area and strong stability， which is widely used in gas storage， separation， catalysis and other fields. In this work， the effect of different reaction conditions， such as the molar ratio of Zn²⁺ to 2?methylimidazole， the amount of surfactant and the reaction solvents， on the size and morphology of ZIF?8 were reported. Among these conditions， the molar ratio of Zn²⁺ to 2?methylimidazole is the key factor affecting the size and morphology of ZIF?8. The synthesized ZIF?8 nanoparticles were characterized by SEM， BET and XRD. The size of ZIF?8 decreases gradually from 1500 nm to 850 nm then to 250 nm， and the morphology changes from truncated hexahedron to truncated dodecahedron and finally to dodecahedron. The specific surface area of ZIF?8 nanoparticles with a particle size of 250 nm is 1730 m²/g， and the pore size and pore volume are 1.5 nm and 0.6 cm³/g， respectively. Therefore， it can be seen that ZIF?8 nanoparticles with a particle size of 250 nm have excellent carrier characteristics. The impregnation method was further adopted to synthesize the supported catalyst， and boron ammonia was used as the reducing agent. The ZIF?8 （250 nm）nanoparticles were loaded with metals/precious metal nanoparticles in situ， the component optimization and catalytic performance were further studied. The obtained catalyst ZIF?8/Pt_0.002@Ni_0.2 shows excellent performance in hydrogen generation from aminoborane.

Key words: Zeolitic imidazolate frameworks-8, Porous material, Catalysis

CLC Number:

O643.3

Wang LI. Morphology Control and Catalytic Dehydrogenation Performance of Zeolitic Imidazolate Frameworks⁃8[J]. Chinese Journal of Applied Chemistry, 2022, 39(7): 1065-1072.

Figures/Tables 7

Fig.1 SEM images of ZIF-8 synthesized with different molar ratios of Zn2+/Hmim

Table 1 The morphology and particle size of ZIF?8 synthesized with different molar ratios of Zn2+/Hmim

序号

Num

n（Zn²⁺）/n（2?甲基咪唑）

n（Zn²⁺）/n（Hmim）

形貌

Morphology

截角立方体

Truncated cube

截角十二面体

Truncated dodecahedron

截角十二面体

Truncated dodecahedron

十二面体

Dodecahedron

十二面体

Dodecahedron

十二面体

Dodecahedron

十二面体

Dodecahedron

十二面体

Dodecahedron

粒径/nm

Patical size/nm

Fig.2 TG curve of ZIF-8 （250 nm）

Fig.3 XRD patterns of ZIF-8 treated with different pH conditions

Fig.4 （A） N2 adsorption-desorption isotherms and （B） pore size distributions of ZIF-8 （250 nm）

Fig.5 Dehydrogenation test curves of ZIF-8/Pt0.02，ZIF-8/Pd0.02 and ZIF-8/Au0.02

Fig.6 Dehydrogenation test curves of （A） ZIF-8/Pt0.002@Fe0.1，ZIF-8/Pt0.002@Co0.1 and ZIF-8/Pt0.002@Ni0.1 and （B） ZIF-8/Pt0.002@Ni0.1 and ZIF-8/Pt0.002@Ni0.2

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Morphology Control and Catalytic Dehydrogenation Performance of Zeolitic Imidazolate Frameworks⁃8

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