Journal
CATALYSIS TODAY
Volume 355, Issue -, Pages 580-586Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.05.062
Keywords
Pyrolysis; MOF; Toluene oxidation; Catalytic activity
Funding
- National Key Research and Development Program of China [2016YFC0202202]
- National Natural Science Foundation of China [21777166, 21806169]
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Metal-organic frameworks (MOF) are recently emerging as versatile precursors to fabricate functional MOF-derived materials for catalytic reaction. Herein, MnOx-CeO2-MOF and MnOx-MOF catalysts derived from MOF were prepared via in situ pyrolysis of MOF-74 precursor. In comparison, MnOx-CeO2-CP and MnOx-D catalysts were also synthesized by co-precipitation and thermal decomposition of MnOOH, respectively. The catalytic activity of toluene oxidation was in the order of MnOx-CeO2-MOF > MnOx-MOF > MnOx-CeO2-CP > MnOx-D, and the MOF-based catalysts were superior to MnOx-CeO2-CP and MnOx-D catalysts. The incorporation of Ce into MnOx resulted in the high surface area, abundant oxygen vacancies, good low-temperature reducibility, excellent oxygen mobility and high surface Mn4+ content, where the surface Mn4+ played a crucial role in the enhanced catalytic activity of toluene oxidation. MnOx-CeO2-MOF catalyst exhibited the T-50 and T-90 values of 210 and 220 degrees C and apparent activation energy (Ea) of 82.9 kJ/mol, which were lower than thoese of other catalysts.
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