Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 267, Issue -, Pages 134-139Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2018.08.019
Keywords
Co@carbon nanocomposites; ZIF-67 crystal; Colloidal silica; Mesoporous; Ammonia decomposition
Funding
- National Natural Science Foundation of China [21503184, 21677119]
- Talent Introduction Project of Yancheng Institute of Technology [xj201507]
- Jiangsu Qinglan Project
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Mesoporous Co@carbon nanoplates, derived from zeolitic imidazolate framework-67 (ZIF-67) crystals, were facilely prepared via a silica-assisted strategy. Through introducing and removing colloidal silica during synthetic process, the Co@carbon nanocomposites (CoOx@CS) exhibited mesopores characteristic and nanoplates. By comparison, the Co@carbon nanocomposites (CoOx@C), obtained by a direct pyrolysis of ZIF-67, exhibited micropores characteristic and assembled microsphere. In catalytic decomposition of ammonia, it was found that the CoOx@CS nanocomposites showed excellent catalytic activity. Nearly 60% NH3 conversion was achieved at 500 degrees C with a space velocity of 6000 h(-1) whereas only similar to 30% NH3 conversion was achieved under the same reaction conditions for CoOx@C nanocomposites. The enhanced activity should be attributed to mesoporous characteristic, nanoplates-like microstructure and basicity of carbon support. This study provides new insights into the development of controlling the structural orders of MOFs-derived carbon-based materials.
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