Influence of the pore structure of Ce/MgAl hydrotalcite-derived mixed oxides on its SO_x pick-up capacity

The sulfur-transfer catalyst is widely used to remove the sulfur oxides (SOx ) from the flue gas in the fluid catalytic cracking (FCC) units. This paper reports the influence of the pore structure of the Ce/MgAl hydrotalcite-derived mixed oxides on its SO x pick-up capacity. The Ce/MgAl hydrotalcites precursors were synthesized by the separate nucleation and aging steps (SNAS), and then were calcined in air at 800℃ to prepare the Ce/MgAl mixed oxides. And in our preparations, the pore structures of the Ce/MgAl mixed oxides were controlled by modifying the aging time of the hydrotalcites precursors. It is found that with the aging time of 4 to 6 h produced the largest pore volume (the largest total pore volume and the least pore less than 10 nm) and resulted in the largest SOx pick-up capacity.

The sulfur-transfer catalyst is widely used to remove the sulfur oxides （SOx） from the flue gas in the fluid catalytic cracking （FCC） units. This paper reports the influence of the pore structure of the Ce/MgAI hydrotalcite-derived mixed oxides on its SOx pick-up capacity. The Ce/MgA1 hydrotalcites precursors were synthesized by the separate nucleation and aging steps （SNAS）, and then were calcined in air at 800~C to prepare the Ce/MgA1 mixed oxides. And in our preparations, the pore structures of the Ce/MgAI mixed oxides were controlled by modifying the aging time of the hydrotalcites precursors. It is found that with the aging time of 4 to 6 h produced the largest pore volume （the largest total pore volume and the least pore less than 10 nm） and resulted in the larg- est SOx pick-up capacity.