فؤاد كاظم مهدي شعبان

In this study, a bimetallic Co Mo spicy supported on γ-Al2O3 heterogeneous catalyst was successfully prepared by an incipient wetness impregnation for a hydrodesulphurization (HDS) reaction of heavy Naphtha liquid produced from AN- Najaf refinery. The structural characteristics of the prepared 5Co-15Mo/γ-Al2O3 catalyst were evaluated by scanning electron microscopy (SEM) and X-ray powder Diffraction (XRD) spectroscopies. The surface area, pore volume and pore size were determined by a Brunner–Emmett–Teller (BET) method. The catalytic activity in the removal of sulphur compound from a heavy naphtha through the HDS at four different reaction temperatures (523, 548, 573, 598 °K) and four different liquid hourly space velocities (3, 4, 5, and 6 hr-1) under a constant ratio of 150 mL H2/1 mL naphtha and a hydrogen gas pressure of 1.5 MPa, has revealed that the prepared catalyst was efficient to remove 82 % of sulphur at 598 °K temperature and 3 hr-1 time. The enhanced selectivity of the CoMo/γ-Al2O3 catalyst through a hydro-treating reaction ascribes to the bimetallic-support interaction and the dispersion of MoS2 particles that leaded to a large edge-to-corner ratio of CoMoS slabs.

This study investigates the role of inserting tungsten metal (W) on the catalytic activity of trimetallic W-Mo-Co supported on Gamma-Alumina (γ-Al2O3) heterogeneous catalyst used for a hydrodesulphurization (HDS) in the oil refinery. A bimetallic Co5Mo15/γ-Al2O3 and a trimetallic Co5Mo14W1/γ-Al2O3 catalysts were synthesized by an incipient wetness impregnation. The synthesized trimetallic Co5Mo14W1/γ-Al2O3 catalyst exhibited a better catalytic performance of 88 % hydro-removal percentage of sulfur through the HDS reaction of petroleum naphtha compared to 82 % for the bimetallic 5Co-15Mo/γ-Al2O3 catalyst following the same operation conditions of pressure 11.5 bar, temperature 598°K and reaction time of 3 hr. The enhanced catalyst's activity is attributed to the presence of tungsten metal that contributed in increasing the metal sites on the catalyst's reaction surface.

Corrosion inhibition of mild steel in 1 M hydrochloric acid using Iraqi apricot tree gum Arabic as natural polymer was studied. The weight loss method was used to predict the efficiency of the inhibitor on corrosion of mild steel in a temperature range of 17–40∘ C. The FTIR result of natural polymer revealed that the C=O and O-H groups were found in the structure of the natural polymer. The results of weight loss method showed that the inhibition efficiency (

Bimetallic Co 5Mo15 of 5 wt% Cobalt as a promoter and 15 wt% Molybdenum as an active metal and trimetallic Co 5Mo15-xWx (x=1, 3, 5 wt%) heterogeneous catalysts supported on gamma alumina (γ-Al2O3) were synthesized by an incipient wetness co-impregnation process. The structural and the physicochemical characteristics of the prepared bi- and tri-metallic catalysts were evaluated by the XRD, SEM, BET and BJH. The role of third W active metal on the catalytic activity was determined through a hydrodesulfurization (HDS) reaction of naphtha at four different reaction temperatures (250, 275, 300, 325 °C) and four liquid hourly space velocities, LHSV (3, 4, 5, 6 h−1) under constant 1.5 MPa H2 pressure. The trimetallic CoMoW5 catalyst exhibited the maximal HDS efficiency at 325 °C and 3 h−1 liquid flow of 88% sulfur removed compared to the CoMo catalyst. This was ascribed for the role of the highly dispersed active W metal and presence of the sulfided CoMoWS and CoWS sites on the alumina surface that leads to increase the surface area and the porous structure, and enhancing the metal/sulfur bond. Keywords Trimetallic catalyst · Heterogeneous · Hydrodesulfurization · Tungst