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This work reports on the application of a rare earth organic compound, praseodymium 4-hydroxycinnamate -Pr(4OHCin) 3 , as an effective inhibitor suitable for preventing carbon dioxide corrosion of steels in an aggressive environment. Two steels, namely an AS1020 and a X65 steel, have been tested in 0.01 M NaCl solution saturated with carbon dioxide gas using electrochemical and surface analysis techniques. The results show that X65 steel is less susceptible to corrosion than AS1020 steel in CO 2 -saturated 0.01 M NaCl solution as indicated by a lower corrosion current density and a higher polarization resistance. On the other hand, the AS1020 was inhibited much more effectively by praseodymium 4-hydroxycinnamate compound in comparison with X65 steel, as the corrosion behavior of AS1020 and X65 steels was similar in the presence of the inhibitor. However, the inhibiting effects on the anodic reaction was greater for AS1020 due to a reduction in the anodic current density in comparison with X65 steel. The dramatic effect of praseodymium 4-hydroxycinnamate compound could be attributed to the protective inhibiting deposits and enhanced film formation on the more active steel surface.

Hydrogenolysis of glycerol was conducted on catalyst of the type mixed oxide of Cu-Cr doped with NiO on g-Al2O3. The prepared catalyst was analyzed by XRD, IR and TPR. Catalytic tests were carried out on a laboratory plant in continuous flow system on a reactor equipped with heating mantle, at molar ratio of glycerol / hydrogen of 1/300, glycerol volume hourly space velocities 1000s-1, temperatures 200-220oC and pressures 3-5 bar. The main reaction products identified were propylene glycol and hydroxyacetone. Glycerol conversion increases with temperature and pressure on ranges of parameters studied. Selectivity to propylene glycol increases with increasing of temperature and pressure and the selectivity to hydroxyacetone decreases with increasing of temperature and pressure on the variation range of the parameters studied.

Desulphurization by reactive adsorption was studied on sand abrasive blasting grit/ bentonite. The adsorbent was characterized by determining the composition, adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments were performed in continuous system at 260�300oC, 25 atm and volume hourly space velocities of 1-2 h-1. The efficiency of adsorption was evaluated at desulphurization of a synthetic reaction mixture and a catalytic cracking gas oil.

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