Preparation of the Al₁₃ Sol via Electrodialysis as an Effective Binder of FCC Catalysts

Abstract

This study presented a clean preparation process of alumina sols via electrodialysis. For the first time, as an effective binder for fluid catalytic cracking catalysts, the Al 13 -enriched product was found to be easily converted to γ-Al 2 O 3 with a larger BET specific surface area, pore volume, more Lewis acids, Al-OH sites, and lower Cl − content after calcination. A series of spray-dried FCC catalysts were steam-aged and tested by heavy oil cracking. In comparison with the commercial sol-containing FCC catalysts, Al 13 -containing catalysts exhibited higher accessibility of active centers, mechanical strength, heavy oil cracking ability, and liquid yield.

Improving the Anticorrosion and Self-Healing Properties of the Epoxy Coating Using the Mn–Zn2SiO4/PDA Composite

“…The Brunauer–Emmett–Teller (BET) method utilizes N 2 as the adsorbate to study the adsorption and desorption processes on the surface of solid materials, thereby calculating the specific surface area of the solid material . The results showed that the Mn–Zn 2 SiO 4 /PDA sample had a smaller specific surface area and pore volume compared with Zn 2 SiO 4 /PDA (Figure a,b), indicating a denser structure.…”

“…The Brunauer−Emmett−Teller (BET) method utilizes N 2 as the adsorbate to study the adsorption and desorption processes on the surface of solid materials, thereby calculating the specific surface area of the solid material. 47 The results showed that the Mn−Zn 2 SiO 4 /PDA sample had a smaller specific surface area and pore volume compared with Zn 2 SiO 4 / PDA (Figure 4a,b), indicating a denser structure. This compact structure can effectively prevent corrosive media from entering the interior of the material and can also fill the gaps in the coating, increasing the density and thickness of the coating and forming a uniform coating surface.…”