期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 364, 期 -, 页码 571-580出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.10.020
关键词
Co-ZIF-L; Monolithic catalysts; Layered double hydroxides; Toluene oxidation; Ni foam
资金
- Science and Technology Planning Project of Guangdong Province China [2015B0202236002]
- National Natural Science Foundation of China [51108187, 51672273, B5151050]
- Guangdong Natural Science Foundation [2016A030311003]
Herein, a series of distinctively monolithic catalysts were first synthesized by decorating leaf-like Co-ZIF-L derivatives on Co2AlO4 coral-like microspheres from CoAl layered double hydroxides (LDHs), which were coated on three-dimensional porous Ni foam. As a proof of concept application, toluene was chosen as a probe molecule to evaluate their catalytic performances over the as-synthesized catalysts. As a result, the L-12 sample derived from Co2AlO4@Co-Co LDHs displayed an excellent catalytic performance, cycling stability and long-term stability for toluene oxidation (T-99 = 272 degrees C, 33 degrees C lower than that of Co(2)AlO4 sample), where leaf-like Co-ZIF-L served as a sacrificial template to synthesize Co-Co LDHs. The improved catalytic performance was attributed to its distinctive structure, in which leaf-like Co-ZIF-L derivatives on Co2AlO4 resulted in its higher specific surface area, lower-temperature reducibility, rich surface oxygen vacancy and high valence Co3+ species. This work thus demonstrates a feasible strategy for the design and fabrication of hybrid LDHs/ZIFs-derived composite architectures, which is expected to construct other novel monolithic catalysts with hierarchical structures for other potential applications.
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