Reaction mechanisms of thioetherification for mercaptans and olefins over sulfided Mo-Ni/Al 2 O 3 catalysts

Thioetherification of isoprene and butanethiol on transition metal phosphides

“…This may be attributed to that there were butanethiol molecules adsorbed on Mo δ+ sites (as shown in Fig. 12 ), which reacted with olefins to form thioethers, in line with the mechanism suggested by Shen et al [7] . In Stage 3 during which butanethiol was again introduced to the reactor, S thioethers rapidly increased to 87.9% at the 18th hour.…”

“…Thus, most sulfur in liquid effluent existed as C9 thioethers; and the rest sulfur (i.e., 1 −S thioethers ) may be contained in C5 mercaptans, C8 thioethers and C10 thioethers, which were not detected probably due to low content. It was found by Shen et al [7] that not only C10 thioethers but also C6 mercaptans, C8 thioethers and C12 thioethers formed in the thioetherification of butanethiol and hexene. During the reaction, the S species adsorbed on catalyst surface http://engine.scichina.com/doi/10.1016/j.jechem.2017.07.017 could combine with hydrocarbon intermediates to form mercaptans and thioethers with different carbon numbers [7] .…”

“…It was found by Shen et al [7] that not only C10 thioethers but also C6 mercaptans, C8 thioethers and C12 thioethers formed in the thioetherification of butanethiol and hexene. During the reaction, the S species adsorbed on catalyst surface http://engine.scichina.com/doi/10.1016/j.jechem.2017.07.017 could combine with hydrocarbon intermediates to form mercaptans and thioethers with different carbon numbers [7] . The high S thioethers also confirms that 25%MoP is very efficient for thioetherification.…”

“…Widely applied in Prime-G + processes, sulfided Mo-Ni/Al 2 O 3 is more active and stable than sulfided Ni/Al 2 O 3 [5,6] because of the promotion of Mo that modifies the electronic and structural properties of Ni [6] . The thioetherification mechanism on sulfided Mo-Ni/Al 2 O 3 was proposed [7] . The Fe-promoted Ni/Al 2 O 3 catalysts were also investigated and showed good ability for thioetherification at as low as 75 °C [8] .…”

Effect of modified carrier fluoride on the performance of Ni–Mo/Al2O3 catalyst for thioetherification

“…Nowadays, thioetherification catalysts mainly load NiO and MoO 3 on alumina supports. Modification of the catalysts has become an important strategy to further improve the catalytic activity, selectivity and service life of the catalysts (Hartwig 2008;Huang et al 2018a, b;Liu and Szostak 2018;Rodriguez et al 1999;Shen et al 2015). Among the numerous modification strategies, synthesis of fluorine-modified γ-Al 2 O 3 was one of the most effective (Flego and Parker Jr 1999;Kwak et al 2000;Lewis et al 1989).…”