Reaction Studies with Mixtures of Pure Compounds

On the hydrodesulfurization of FCC gasoline: a review

“…A similar observation was made previously by Meerbott and Hinds [40] although these authors mentioned that this was true only under certain conditions. To account for this phenomenon and for the fact that H 2 S had not the same effect on the hydrogenation of normal and iso-olefins, Hatanaka et al [19,67,68] suggested the existence of three categories of active centers.…”

“…This enlightens the necessity of finding means to limit olefin hydrogenation, which is of course even more crucial in the present context (where lead additives are totally prohibited and the content in aromatics as well as the use of oxygen additives are limited) than in the fifties. Meerbott and Hinds [40] reported also qualitative evidence that normal olefins saturate faster than branched olefins, which as we will see could be of some importance regarding the hydrodesulfurization versus hydrogenation selectivity.…”

“…This was made possible by taking advantage of the acidic properties of the catalyst in order to promote skeletal isomerization of the olefins and hence compensate their saturation. However, Meerbott and Hinds [40] found that under the conditions required for substantial skeletal isomerization to take place, extensive saturation of olefins resulted. This enlightens the necessity of finding means to limit olefin hydrogenation, which is of course even more crucial in the present context (where lead additives are totally prohibited and the content in aromatics as well as the use of oxygen additives are limited) than in the fifties.…”

Activity of transition metal sulfides supported on Al2O3, TiO2 and ZrO2 in the parallel hydrodesulfurization of 1-benzothiophene and hydrogenation of 1-methyl-cyclohex-1-ene

“…Mostly linear olefins such as ethylene [3], propylene [4], but-1-ene [5], hex-1-ene [6][7][8], oct-1-ene [9,10], or cyclopentene [4,11] and cyclohexene [12] were used as model compounds despite the fact that FCC naphtha predominantly contains branched olefins. Only a few studies dealt with more appropriate model compounds such as 1-methyl-cyclopent-1-ene [11] and 2,3-dimethylbut-2-ene [13][14][15][16][17][18] and reported differences in reactivity of linear and branched olefins [19].…”

“…In the case of the HDS reaction, mainly thiophene [5,6,8,10,12,19] has been selected as a model compound and a few studies have been performed with methylthiophenes [7,13,14,18]. In contrast, sulfur in FCC naphtha predominates in the form of alkylthiophenes and the naphtha contains also significant amount of benzothiophene.…”