Journal
CHEMCATCHEM
Volume 10, Issue 21, Pages 4852-4857Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201800764
Keywords
layered double hydroxides; oxidation; spinel oxides; toluene; VOCs
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Funding
- National Key Research and Development Program of China [2017YFC0211102, 2017YFC0211003, 2016YFC0209203]
- National Science Foundation [21777081]
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Considering the radius similarity of Al3+ (0.50 angstrom) and Ga3+ (0.62 angstrom), Al-Co and Ga-Co layered double hydroxides (LDH) was prepared as precursor to improve the synergetic interaction of the transition metals. The Al-Co and Ga-Co spinel catalysts were obtained by the following calcination for the toluene oxidation. The Ga-Co (E-a=79.5 kJ mol(-1)) showed higher activity than the Al-Co (E-a=95.4 kJ mol(-1)), and it exhibited excellent stability and resistance to carbon deposition during a 50 h reaction period at 300 degrees C. Characterization results indicated that the improved activity of Ga-Co spinel could be attributed to the higher reducibility (H-2-TPR), more surface Co3+ and adsorbed oxygen in quantity (XPS) and adsorbed toluene (Toluene-TPD) than Al-Co spinel. Compared with traditional Ga-Co binary catalyst, the spinel structure possessed more B-sites cations outermost of the surface and surface oxygen vacancies for the toluene adsorption and ring-open reaction.
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