## 3 Results
It was experimentally found that an increase in nickel concentration did not result in an increase in ethylbenzene yield. In this case, the yield of ethylbenzene was 63.52%, which shows high activity and selectivity of the prepared nanocatalyst. The most active catalyst for hydrogenation of benzothiophene is molybdenum catalyst [12; 20]. The yields of 2,3-dihydrobenzothiophene and ethylbenzene presented in the articles are relatively comparable to our results of hydrogenation of benzothiophene in the presence of a nanocatalyst based on nanoparticles on chrysotile (Table 7). Chromato-mass spectrometry was used to specify the individual chemical composition of the hydrogenates. The results of studying the component composition of the hydrogenate are given in Table 8.  
All the hydrogenates identified benzothiophene, 2,3-dihydrothiophene, ethylbenzene, fentantrene, and deep hydrogenolysis products--octane, decane, and undecane in various amounts. Analysis of the component composition of the hydrogenates shows that for all types of the catalytic additives, the mechanism of the destructive hydrogenation was identical, with some difference in the flow rates of individual stages and directions of conversion of intermediates. From the literature analysis [8], it is known that the mechanism of the benzothiophene dusulfurization can proceed with preliminary saturation of the aromatic structure:  
(5)  
or: \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**N**} & \multirow{2}{*}{**Component Name**} & \multicolumn{8}{c}{**Experience \(\boldsymbol{\mathcal{N}}\)**} \\ \cline{3-8}  & & **3** & **4** & **5** & **6** & **7** & **8** & **9** \\ \hline
1 & Benzothiophene & 45.20 & 61.57 & 62.67 & 63.96 & 30.99 & 51.98 & 48.06 \\
2 & 2,3 dihydrothionaphthene & 5.93 & 12.20 & 14.24 & 16.20 & 3.52 & 14.59 & 19.61 \\
3 & Ethylbenzene & 10.74 & 12.90 & 21.39 & 18.20 & 63.52 & 31.89 & 27.12 \\
4 & Alkanes Cs-C11 & 3.23 & - & - & - & - & - & 2.30 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Individual chemical compositions of the hydrogenates obtained under the various conditions of the benzothiophene hydrogenation process. In hydrogenation processes, sulfur compounds are highly reactive. The catalyst activity was evaluated using the residual amount of the non-converted benzothiophene feedstock. The largest observation of the residual benzothiophene 63.96% was observed for the following test conditions: C\({}_{HCl}\)--0,6 mol/L, C\({}_{HCl/Ni^{2}}\)--5, C\({}_{HCl/Co^{3+}}\)--5. The minimum residual benzothiophene value of 30.99% was observed for the following test conditions: C\({}_{HCl}\)--1 mol/L, C\({}_{HCl/Ni^{2}}\)--20, C\({}_{HCl/Co^{3+}}\)--20, i.e., these conditions of the experience correspond to the maximum conversion of raw materials. Ethylbenzene was found in all products, resulting from the deeper transformations that proceed through the reaction:  
(7)  
It should be noted that the ethylbenzene is the main product in the hydrogenate. It was present in an amount of 10.74-63.52% An intermediate to the formation of the ethylbenzene is 2,3-dihydrobenzothiophene, which was identified in a smaller amount in the hydrogenate products, 3.52-19.61%. The presence of this product indicates the progress of the desulfurization through preliminary hydrogenation, followed by the break of hydrogenated bonds, that is, the elimination of sulfur without preliminary hydrogenation did not occur. The degree of the benzothiophene conversion was evaluated by the yield of the desired product (ethylbenzene) in the hydrogenate. The greatest degree of benzothiophene conversion was observed for Run 7 conditions: C\({}_{HCl}\)--1 mol/L; C\({}_{HCl/Ni^{2}}\)--20; C\({}_{HCl/Co^{3+}}\)--20. The degradation of non-aromatic sulphur compounds is easier than aromatic sulphur compounds with C-S bond breaks. The composition of the products showed that rings containing a heteroatom were hydrogenated on the catalysts, followed by a bond break.