## 2 The Published Articles  
The first article [1] focuses on a catalyst based on molybdenum oxide supported on mesoporous silica with a cerium (Ce) modifier, which was prepared by in situ synthesis and used in a hydrogen peroxide desluurization system (H\({}_{2}\)O\({}_{2}\)) of dibenzothiophene (DBT), benzothiophene (BT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) from fuel oils. Freshly, after synthesis, its catalytic performance was studied involving Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Brunner-Emmet-Teller (BET) and X-ray photoelectron Spectroscopy (XPS). The second article [2] focuses on polycrystalline diamond (PCD) coated mechanical sealing rings, which were prepared by hot filament chemical vapor deposition (HFCVD) on graphite loaded silicon carbide (GSiC) substrates using incandescent filament. The polycrystalline diamond deposition process has, in the initial phase, a nucleation, then a growth of the layer through a dense coating with a grain size of 4 \(\upmu\)m and a thickness of 12.3 \(\upmu\)m. The evolution of the crystalline phase and their morphologies on the substrate was investigated during the growth process of diamond crystallites. The well-developed PCD coating, as confirmed by Raman spectroscopy and X-ray diffractometry, significantly improves the applied mechanical sealing limit under harsh operating conditions at the pressure-velocity combination, regardless of whether the combination is for a hard-to-soft mating or a mating combination difficult to very difficult. The samples obtained were evaluated using the same friction and wear testing machine, with adjustable rotation speed and load, which allowed to compare GSiC with sintered silicon carbide (SSiC) with the combination (GSiC/SSiC), taking the GSiC variants by the combination based on graphite (GSiC/graphite), PCD with a combination of graphite(PCD/graphite) and PCD with a combination of SSSiC (PCD/SSiC). The highest pressure velocity (PV) limit of 42.31 MPa\(\cdot\)m/s with 4 kN load at a rotation speed of 4500 rpm was found. For them, an extremely low but stable coefficient of friction and super mechanical properties were obtained in harsh working conditions. These can be accepted as a source of PCD coverage as the high PV limit. Another article [3] with a topic on a close field of advanced materials, focuses on the study of implants based on iron (Fe) alloys, which has attracted attention in recent years due to its biodegradability, biocompatibility and superior mechanical properties. However, too slow degradation in a physiological environment limits its further clinical application. The paper studied the alloy of Fe with mesoporous carbon (MC), manufactured by means of a laser additive, which was used as a bone implant. In particular, MC possesses a noble standard corrosion potential and excellent electrical conductivity, thus acting as an effective cathode and activating micro-galvanic corrosion in the Fe matrix. More importantly, its large specific surface area improved the cathode-to-anode surface ratio, which further improved the galvanic corrosion effect. As a consequence, the corrosion rate was improved from 0.09 to 0.24 mm/year based on immersion tests. In addition, the Fe/MC composite exhibited good cytocompatibility as well as excellent mechanical properties. Another study [4] aims to evaluate the corrosion resistance of carbon steel, used for manufacturing carabiners, coated with three different types of phosphate layer. These have been obtained by phosphate conversion coating with three different types of phosphate solutions: zinc-based phosphate solution, zinc-iron-based phosphate solution and manganese-based phosphate solution. In addition, the test to evaluate the lubricant capacity was performed by comparing zinc phosphate samples with those coated (impregnated) with molybdenum disulfide dispersions in oil and respectively zinc phosphate covered with an elastomer-based paint layer.