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The sulfur-transfer catalyst plays an important role in the fluid catalytic cracking (FCC) process through which the sulfur oxides (SO x ) are removed from flue gas. This work reports the synergistic effect between CeO 2 and MgO on the SO x oxidation and adsorption in the FCC process. The CeO 2 acts as the oxidation promoter, while MgO is the active phase for SO x adsorption. The influence of crystal size on the synergistic effect between CeO 2 and MgO on the SO x oxidation and adsorption was investigated. It was observed that the initial apparent SO x pick-up rate decreases with the increase in the CeO 2 crystal size, while the maximum SO x oxidation and adsorption capacity decreases with the increase in the MgO crystal size. Therefore, this work provides a detailed understanding of the synergistic effect between CeO 2 and MgO for the SO x pick-up, which is crucial for the rational design and preparation of the sulfur-transfer catalysts.
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Jiang et al. (2011) studied this question.
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