Abstract
The effect of annealing temperature on the structure of unsupported Co-promoted MoS2 nanosheets, prepared by mechanical activation of MoO3, S and Co(NO3)2·6H2O followed by annealing in an Ar atmosphere, is reported. An increase in annealing temperature reduced the catalyst surface area but increased the MoS2 stack height. Annealing temperatures above 600 °C also produced segregated CoxSy phases. The dibenzothiophene hydrodesulphurization activity and the direct desulfurization (DDS) to hydrogenation product ratio of the Co–MoS2 catalysts was significantly higher than for MoS2. Moreover, the DDS product selectivity of the Co–MoS2 catalysts was enhanced with increased annealing temperature up to 600 °C. Above 600 °C, the loss in activity and selectivity was due to segregation of CoxSy species and significant sintering of the MoS2 crystallites. Similar effects of high temperature sintering on the activity of MoS2 were also observed.
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Acknowledgments
Financial support from the Natural Science and Engineering Research Council (NSERC) of Canada is gratefully acknowledged. Wu Z. Z. acknowledges fellowship support from the China Scholarship Council and financial support from the National Natural Science Foundation of China (Grant No. 51302326).
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Wu, Z., Whiffen, V.M.L., Zhu, W. et al. Effect of Annealing Temperature on Co–MoS2 Nanosheets for Hydrodesulfurization of Dibenzothiophene. Catal Lett 144, 261–267 (2014). https://doi.org/10.1007/s10562-013-1143-y
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DOI: https://doi.org/10.1007/s10562-013-1143-y