Abstract
The removal of sulfur compounds from petroleum is increasingly important because of the environmental pollution caused by sulfur compounds. In this work, Na doped Ni2P/MCM-41 catalysts were successfully prepared, and their hydrodesulfurization (HDS) performances were assessed using dibenzothiophene (DBT) as a model molecule. Moreover, the effects of reduction temperature (450–600 °C) on the structure and HDS performance of the Ni2P/Na-MCM-41 catalysts were studied. Results showed that: (a) the reduction temperature of the catalyst could be as low as 450 °C due to Na doping, which is about 200 °C lower than that of the conventional temperature-programmed reduction method (650–1000 °C); (b) increasing the reduction temperature lead to an increase in the diameter of Ni2P particles, which was demonstrated by size distribution analysis; (c) the HDS performance of the Ni2P/Na-M41-T catalysts increases with reduction temperature and 99.2% DBT conversion was observed for Ni2P/Na-M41-600, whereas the hydrogenation route of the catalysts decreased with increasing the reduction temperature, which indicates the lower reduction temperature favored the direct desulfurization pathway (DDS).
Highlights
The removal of sulfur from gasoline and diesel fuels has been the subject of intensive investigations in recent years
The reducibility of precursors was characterized by the H2 temperature programmed reduction (H2-temperatureprogrammed reduction (TPR)) using PC-1200 gas adsorption analyser
The X-ray diffraction (XRD) patterns were obtained with a D/max-2200PC-X-ray diffractometer using Cu Ka radiation under the setting conditions of 40 kV, 30 mA, scan range from 10 to 80 at a rate of 10 minÀ1
Summary
Catalyst surface.[13] to the best of our knowledge, the effect of reduction temperature on the performance of Na doped support was not discussed and role of Na is still not fully recognized. The Ni2P catalyst supported on the Na doped MCM-41 supports (Na-MCM-41) were successfully prepared. The aims of this research are to study the effect of reduction temperature on the structure and HDS performance of the Ni2P/ Na-MCM-41 catalyst and propose a promising low energy consumption (a low reduction temperature) and high HDS activity preparation method of supported Ni2P catalysts
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