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

Developing structurally stable sorbents for high-temperature H 2 S 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 Ca x Cu y Mn z O i /MAS-9 sorbents were fabricated via a facile sol–gel method using high-activity phase Ca x Cu y Mn z O i anchored onto versatile mesoporous MAS-9. After O/S-exchange procedure, noteworthy straight channels of MAS-9 ( S BET  = 808 m 2 g −1 ) provided enough available spaces for the storage of generative large MeS y nanoparticles, which was better than other conventional zeolites. The probing of variables ( i.e. support type, active ingredient, loadings, and sulfidation temperature) on H 2 S removal revealed that 50%Ca 3 Cu 10 Mn 87 O i /MAS-9 shared an excellent breakthrough sulfur capacity (171.57 mg g −1 ) at 800 °C, even it experienced six reusable cycles, due to synergistic stabilizing effect of Ca-Cu-Mn and high-temperature tolerance of Si O Al 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 H 2 S diffusion or component deactivation vs . duration time on stream according to the followed kinetic investigation. Thus, the refined Ca 3 Cu 10 Mn 87 O i /MAS-9 possesses the expected representative desulfurization nature and great potentiality for raw HCG in practical applications.