Catalysis by transition metal sulphides : from molecular by Raybaud

By Raybaud

The major program of transition steel sulphides as reliable catalysts is for construction of fresh fuels in petroleum refineries. a number of the feedstocks to be processed all comprise roughly sulphur, integrated in hugely good heteroaromatic molecules. for you to meet the stringent requisites imposed around the globe these days on transportation fuels to lessen their environmental effect, catalytic hydroprocessing continues to be crucial. during this procedure, sulphur is got rid of as H2S following the response among molecular hydrogen and the heteroaromatics. This e-book goals to supply an entire, finished, and up-to-date survey of the sector that might be worthwhile to somebody concerned; the coed beginning a study undertaking, the tutorial researcher, or the refinery engineer will deepen their wisdom at the features of the catalytic approach. Thirty-seven experts from IFP Energies nouvelles, CNRS, and French universities have contributed, reporting a distinct synthesis of the final fifteen years of research.

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J. Phys. Chem. C 113, pp 19545-19557. Bollinger MV, Jacobsen KW and Nørskov JK (2003) Atomic and Electronic Structure of MoS2 Nanoparticles. Phys. Rev. B 67, p 085410. Bollinger MV, Jacobsen KW, Nørskov JK, Lauritsen JV, Helveg S and Besenbacher F (2001) Phys. Rev. Lett. 87, p 6803. Bouwens SMAM, Koningsberger DC, de Beer VHJ, Louwers SPA and Prins R (1990) EXAFS Study of the Local Structure of Ni in Ni-MoS2/C Hydrodesulfurization Catalysts. Catal. Lett. 5, p 273. Bouwens SMAM, Veen JARv, Koningsberger DC, Beer VHJd and Prins R (1991) EXAFS Determination of the Structure of Cobalt in Carbon-supported Cobalt and Cobalt-molybdenum Sulfide Hydrodesulfurization Catalysts.

2002b]. 20 where the values are given for the M-edge and S-edge energy as a function of the reaction conditions (for Τ = 625 Κ and various p(H2S)/p(H2)) for two promoter (Co and Ni) edge contents (50% and 100%). 21. 6 eV), Co reveals a similar affinity for both edges. The edge energies for 100% Co are almost identical, which shows that a highly sulphiding regime (high p(H2S)/p(H2)) tends to stabilise the promoter on both edges. 6 eV enhances the affinity of Co for the S-edge with respect to the M-edge.

This means that destabilisation of the mixed S-edge site phase may occur if excessively strong reductive conditions are explored. Indeed, earlier Mössbauer spectroscopy characterisation by Breysse et al. , 1983, 1984]. This observation can be explained by the thermodynamic segregation quantified by the larger increase in the edge energies of the CoMoS with respect to the non-promoted system under such conditions. 2). 1, the bulk sulphur-metal bond energy is a relevant descriptor for the activity of the TMS active phases.

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