SOx Oxidation and Adsorption by CeO2/MgO: Synergistic Effect between CeO2and MgO in the Fluid Catalytic Cracking Process

Industrial & Engineering Chemistry Research; Apr2011, Vol. 50 Issue 8, p4398-4404, 7p.
SOx Oxidation and Adsorption by CeO2/MgO: Synergistic Effect between CeO2and MgO in the Fluid Catalytic Cracking Process
Lei Jiang 1
Min Wei 1
Xiangyu Xu 1
Yanjun Lin 1
Zhi LuÌ 1
Jiaqing Song 1
Xue Duan 1
1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, Peopleâ??s Republic of China.
Abstract
The sulfur-transfer catalyst plays an important role in the fluid catalytic cracking (FCC) process through which the sulfur oxides (SOx) are removed from flue gas.
This work reports the synergistic effect between CeO2and MgO on the SOxoxidation and adsorption in the FCC process.
The CeO2acts as the oxidation promoter, while MgO is the active phase for SOxadsorption. The influence of crystal size on the synergistic effect between CeO2and MgO on the SOxoxidation and adsorption was investigated. It was observed that the initial apparent SOxpick-up rate decreases with the increase in the CeO2crystal size, while the maximum SOxoxidation and adsorption capacity decreases with the increase in the MgO crystal size. This work provides a detailed understanding of the synergistic effect between CeO2and MgO for the SOxpick-up, which is crucial for the rational design and preparation of the sulfur-transfer catalysts. [ABSTRACT FROM AUTHOR].
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