Controlled synthesis of highly stable zeolitic imidazolate framework-67 dodecahedra and their use towards the templated formation of a hollow Co3O4 catalyst for CO oxidation

Hongyu Wu; Xukun Qian; Haiping Zhu; Songhua Ma; Guangshan Zhu; Yi Long

doi:10.1039/C5RA18557B

Controlled synthesis of highly stable zeolitic imidazolate framework-67 dodecahedra and their use towards the templated formation of a hollow Co₃O₄ catalyst for CO oxidation†

Hongyu Wu,^a Xukun Qian,*^ab Haiping Zhu,^c Songhua Ma,^a Guangshan Zhu^d and Yi Long*^b

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* Corresponding authors

^a School of Engineering and Design, Lishui University, Lishui 323000, PR China
E-mail: qianxukun@126.com

^b School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
E-mail: LongYi@ntu.edu.sg

^c School of Ecology, Lishui University, Lishui 323000, PR China

^d State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China

Abstract

In this work, dodecahedral microcrystals of zeolitic imidazolate framework-67 (ZIF-67) with good uniformity and exceptional stability have been synthesized by simply controlling the mole ratio of reactants at room temperature. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) characterization indicates that the as-synthesized ZIF-67 microcrystals are highly uniform and have perfect rhombic dodecahedral morphology with 12 exposed {110} faces. The X-ray diffraction (XRD) and thermogravimetry analysis (TGA) investigations demonstrate that they display high thermal stability up to ∼350 °C in air and ∼425 °C in vacuum, as well as remarkable chemical resistance to boiling organic solvents and room-temperature water. Through a two-step oxidative thermolysis process, these ZIF-67 dodecahedra can be further converted into hollow Co₃O₄ architectures consisting of nanosized building blocks. Owing to their large specific surface area and unique structure, the hollow Co₃O₄ catalyst obtained at the calcination temperature of 425 °C exhibits high catalytic activity and stability for gas-phase CO oxidation.

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Article information

DOI: https://doi.org/10.1039/C5RA18557B
Article type: Paper
Submitted: 13 Sep 2015
Accepted: 05 Jan 2016
First published: 12 Jan 2016

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RSC Adv., 2016,6, 6915-6920

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Controlled synthesis of highly stable zeolitic imidazolate framework-67 dodecahedra and their use towards the templated formation of a hollow Co₃O₄ catalyst for CO oxidation

H. Wu, X. Qian, H. Zhu, S. Ma, G. Zhu and Y. Long, RSC Adv., 2016, 6, 6915 DOI: 10.1039/C5RA18557B

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