Effect of various chelating components, multibasic carboxylic acids and glycols, used to prepare hydrotreating catalysts on the activity regeneration of calcined hydrotreating catalysts was studied. Reactivated catalyst samples were tested in a model reaction of hydrodesulfurization of dibenzothiophene. It was shown that the treatment of calcined catalysts with the chelating components leads to an increase in the catalytic activity. The best catalytic characteristics are observed for the catalyst reactivated with a solution containing citric acid and triethylene glycol.
https://pubs.acs.org/doi/10.1021/ie9008343
Co−Mo/B2O3/Al2O3 catalysts were prepared by a post-treatment of the calcined states with citric acid (CA) and were tested for the hydrodesulfurization (HDS) reaction of thiophene. The catalysts were characterized by LRS, UV−visible spectroscopy, Mo K-edge EXAFS, TEM, NO adsorption capacity, and surface area measurements. Catalysts obtained by simultaneous impregnation with citric acid were also prepared for comparison. Sulfided catalysts were characterized by a chemical vapor deposition (CVD) technique using Co(CO)3NO. The addition of citric acid in a post-treatment more effectively increased the catalytic activity and NO adsorption capacity than did addition by a simultaneous-impregnation method. Co-CA and Mo-CA surface complexes formed at the expense of CoMoO4 and polymolybdates. The maximum potential activity of Co−Mo/B2O3/Al2O3 was obtained by a simple post-treatment of the calcined catalyst with citric acid.
The hydrotreating catalyst you’ve mentioned consists of a combination of molybdenum trioxide (MoO3), cobalt oxide (CoO), and alumina (Al2O3). Let’s delve into the details of each component:
Molybdenum Trioxide (MoO3):
MoO3 is a metal oxide that plays a crucial role in hydrotreating processes.
It is known for its ability to promote hydrogenation reactions and sulfur removal.
In hydrotreating, MoO3 facilitates the removal of impurities (such as sulfur, nitrogen, and oxygen) from hydrocarbon feedstocks.
The presence of MoO3 enhances the activity and selectivity of the catalyst.
Cobalt Oxide (CoO):
CoO is another essential component in hydrotreating catalysts.
It contributes to the overall catalytic activity by promoting hydrogenation reactions.
CoO helps break down undesirable compounds (such as sulfur-containing molecules) during the hydrotreating process.
Its presence ensures efficient removal of impurities from petroleum fractions.
Alumina (Al2O3):
Alumina serves as the support material for the active components (MoO3 and CoO).
It provides a stable structure for the catalyst particles.
Al2O3 has high surface area, which allows for better dispersion of MoO3 and CoO.
The combination of MoO3, CoO, and Al2O3 creates an effective hydrotreating catalyst.
Hydrotreating is a critical process in the petroleum industry, where feedstocks (such as crude oil or heavy fractions) are treated with hydrogen under elevated temperatures and pressures. The catalyst you’ve mentioned helps improve product quality by removing impurities and enhancing desirable reactions.
If you’d like more information or have any specific questions, feel free to ask! 🛢️🔬