Probing mesoporous character, desulfurization capability and kinetic mechanism of synergistic stabilizing sorbent CaCuMnO/MAS-9 in hot coal gas.

Developing structurally stable sorbents for high-temperature HS direct removal is recognized as a valuable energy-saving strategy for efficient utilization of hot coal gas (HCG), which depends upon their mesoporous features and desulfurization capabilities. Herein, tailored hierarchical CaCuMnO/MAS-9 sorbents were fabricated via a facile sol-gel method using high-activity phase CaCuMnO anchored onto versatile mesoporous MAS-9. After O/S-exchange procedure, noteworthy straight channels of MAS-9 (S = 808 m g) provided enough available spaces for the storage of generative large MeS nanoparticles, which was better than other conventional zeolites. The probing of variables (i.e. support type, active ingredient, loadings, and sulfidation temperature) on HS removal revealed that 50%CaCuMnO/MAS-9 shared an excellent breakthrough sulfur capacity (171.57 mg g) at 800 °C, even it experienced six reusable cycles, due to synergistic stabilizing effect of Ca-Cu-Mn and high-temperature tolerance of SiOAl framework of MAS-9. Especially, CaO dopant endowed the sorbent with superficial alkalinity and high-temperature resistance. The brilliant desulfurization behavior was also described by the fast HS diffusion or component deactivation vs. duration time on stream according to the followed kinetic investigation. Thus, the refined CaCuMnO/MAS-9 possesses the expected representative desulfurization nature and great potentiality for raw HCG in practical applications.