Abstract
SBA-15-supported iron phosphate (FePO 4) has been characterized with XRD, TEM, Raman spectroscopy and H 2-TPR, and studied for the partial oxidation of CH 4 with O 2. The characterizations suggest that the FePO 4 species with loading amount lower than 40 wt.% are encapsulated within the mesoporous channels of SBA-15, and these species possibly exist as small FePO 4 clusters with the local coordination environment of iron being similar to that in the crystalline FePO 4. However, these encapsulated FePO 4 clusters could be reduced at remarkably lower temperatures than the crystalline FePO 4. The SBA-15-supported FePO 4 catalysts exhibit higher CH 4 conversion and HCHO selectivity than the unsupported and the MCM-41-supported ones in the partial oxidation of CH 4 with O 2. The catalyst with a loading amount of 5 wt.% shows the highest HCHO selectivity at a given CH 4 conversion and the highest HCHO formation rate based on the amount of FePO 4 in the catalyst. It is likely that the improved catalytic performances of the SBA-15-supported samples are related to the enhanced redox properties of FePO 4 species, the large porous diameter and the high inertness of SBA-15.
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