Comnmgal Hydrotalcite-Like Compounds And Their Complex Oxides: Facile Synthesis And Fcc Sox Removal

The X-CoMnMgAl hydrotalcite-like precursors (X-LDHs) were first synthesized by the coprecipitation method using Cl-, CO32-, NO3- and SO42- as the corresponding guest anions, which were further used to prepare X-CoMnMgAl complex oxides (X-LDOs) through calcination. The structure and the surface morphology of the as-prepared samples were characterized by FT-IR, XRD, N-2 adsorption-desorption and SEM. These as-prepared X-LDOs could act as sulfur-transfer catalysts for desulfurization. The activity of SOx adsorption and regeneration was evaluated via a self-assembled fixed-bed reactor simulating the conditions found in the fluid catalytic cracking units. These four types of sulfur-transfer catalysts with the same phase but different structure displayed the following order of desulfurization efficiency: CO3-LDO >Cl-LDO >NO3-LDO > SO4-LDO.