Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 25, Issue 6, Pages 1206-1212Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60169-7
Keywords
Pd/Al2O3; o-xylene; catalytic oxidation; noble metal; VOC
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Funding
- Ministry of Science and Technology of China [2012AA062702, 2010AA64905]
- National Natural Science Foundation of China [21077117]
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The effect of pretreatment on Pd/Al2O3 catalysts for the catalytic oxidation of o-xylene at low temperature was studied by changing the pretreatment and testing conditions. The fresh and pretreated Pd/Al2O3 catalysts were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results showed that the pretreatment dramatically changed the Pd/PdO ratio and then significantly affected the Pd/Al2O3 activity; while the pretreatment had not much influence on Pd particle size. The Pd/Al2O3 pre-reduced at 300 degrees C/400 degrees C, which has fully reduced Pd species, showed the highest activity; while the fresh Pd/Al2O3, which has fully oxidized Pd species, presented the worst performance, indicating the Pd chemical state plays an important role in the catalytic activity for the o-xylene oxidation. It is concluded that metallic Pd is the active species on the Pd/Al2O3 catalyst for the catalytic oxidation of o-xylene at low temperature.
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