Abstract
Au/Ti-HMS was prepared by in situ method, NH 3 deposition–precipitation (NH 3 DP) and urea deposition–precipitation (Urea DP), respectively. The catalysts were characterized by a series of techniques including ICP, powder XRD, N 2 sorption, UV–visible spectroscopy, TEM and H 2-TPR. Using n-octane containing BT, DBT and 4,6-DMDBT as model compound, the performance of the catalysts in oxidative desulfurization (ODS) using in situ generated H 2O 2 from H 2 and O 2 were investigated. The results show that preparation method influences porous structure of the support and gold particles size. In situ sample has maintained the intrinsic structure of Ti-HMS, whereas, the gold particles are not as uniform and small as that of DP sample. NH 3 DP sample still possesses the wormhole structure of HMS despite the absence of typical XRD peak. The mesoporous structure of urea DP sample has been damaged seriously. Au 3+ on outer surface of the support is easier to be reduced than that in pores, as confirmed by H 2-TPR. In addition, the three samples exhibit different catalytic activities in ODS using in situ H 2O 2 as oxidant. For the removal of BT and DBT, Au/Ti-HMS (NH 3 DP) exhibits the highest catalytic activities. Regarding the removal of 4,6-DMDBT, the optimum catalyst is Au/Ti-HMS (In situ); however, Au/Ti-HMS (Urea DP) nearly loses catalytic activity.
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