## 2 Materials and Methods
Micrographs of surface morphology of leached chrysotile and the prepared NiCo/chrysotile nanocatalyst are shown in Figure 1a,b. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Name**} & \multicolumn{8}{c}{**Number of Metals, \%**} \\ \cline{2-13}  & **Ca** & **Ti** & **Mn** & **Fe** & **Ni** & **K** & **Si** & **Al** & **Cr** & **Co** & **Cl** & **Sr** \\ \hline NiCo/chrysotile & 0.09 & 0.01 & 0.10 & 6.67 & 31.6 & 0.06 & 12.9 & 20.1 & 0.19 & 28.3 & - & - \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Elemental chemical composition of the nanocatalyst. Figure 1: Microphotography of SEM of leached chrysotile and the NiCo/chrysotile nanocatalyst: (**a**) leached chrysotile; (**b**) NiCo/Chrysotile. Figure 1a shows that the chrysotile nanotubes were wound on top of each other and formed a fibrous structure. Micrograph studies showed that the diameter of chrysotile nanotubes was 60-75 nm, and the diameter of the fiber consisting of long-twisted and combined nanotubes was about 1 \(\upmu\)m.  
It was observed that the deposition of metal nanoparticles on the surface of leached chrysotile by wet mixing led to the opening of the fibrous structure (Figure 1b). It was noticed that the diameter of the deposited particles was 70-120 nm. According to the general rules of catalyst theory, catalyst activity is determined by specific surface area. The high specific surface area depends on the micro-, meso-, and macropores' presence in the catalyst structure. The Brunauer-Emmett-Teller (BET) method was employed to characterize the porous structure of the leached chrysotile and NiCo/chrysotile nanocatalyst samples. Using the BET method based on low-temperature (77 K) nitrogen adsorption isotherms (Figure 2a,b) obtained with SoftSorbi-II ver.1.0 No. 843, the specific surface area and pore volume of the samples were calculated. From the nitrogen adsorption isotherm of leached chrysotile and NiCo/chrysotile nanocatalyst obtained in the range of relative partial pressures P/P\({}_{0}\) = 0.05\({}^{-1}\), it is difficult to determine the nature of the pores. However, according to [PERSON]'s classification, it resembles a hysteresis loop of type H3 [18], which means that the pores are considered mainly hole-like. The catalyst support (chrysotile) is an adsorbent structured material since the pores are nanotubes, channels, and cavities in the solid matrix. Table 3 shows the specific surface area and the specific pore volume of the leached chrysotile and the NiCo/chrysotile nanocatalyst. The porosity of the leached chrysotile was also relatively high. High porosity is influenced by the presence of nanoscale tubes in chrysotile. Wet deposition of nickel and cobalt on the surface of chrysotile leads to a decrease in its specific surface area. The decrease in the volume of pores in the nanocatalyst from 0.121 to 0.074 cm\({}^{3}\)/g is associated with the adsorption of metals on the surface of chrysotile. Experiments on the hydrogenation of the model compound were carried out in a high-pressure reactor (autoclave, maximum operating pressure of the reactor is 20 MPa), with the capacity of 0.05 L, with the internal stirrer manufactured by PRC. A mixture of 1 g benzothiophene and 0.01 g nanocatalyst was premixed and then placed in the high-pressure reactor. The autoclave was closed, purged with hydrogen, and given the overpressure of hydrogen (3.0 MPa). The mixture was heated to the desired temperature (400 \({}^{\circ}\)C) and held for  
Figure 2: Isotherms of leached chrysotile adsorption and NiCo/chrysotile nanocatalyst: (**a**) leached chrysotile; (**b**) NiCo Nano catalyst/chrysotile. \begin{table}
\begin{tabular}{c c c} \hline
**Catalysts** & **Specific Surface Area (BET method), SW, m\({}^{2}\)/g** & **Specific Pore Volume (R \textless{} 47.7 nm), cm\({}^{3}\)/g** \\ \hline Chrysotile & 39.4 \(\pm\) 0.6 & 0.121 \\ NiCo/chrysotile & 37.5 \(\pm\) 0.6 & 0.074 \\ \hline \end{tabular}
\end{table} 
Table 3: Porosity characteristics of the leached chrysotile and the NiCo/chrysotile nanocatalyst. 60 min.