A Study On Sulfur Transfer Additives For FCC Process

With the global increasing pollution of SOx, the emission problem of SOx in FCC process should be solved. An effective method to reduce the SOx pollution from flue gas is to add sulfur transfer additives into FCC equipment. The molecular sieves of the FCC catalyst can be destroyed by additives contained V and result in a lower activity, and Ce is expensive.The Mn-MgAl spinels and the compounded MnMgAl oxides from LDHs precursor were respectively prepared by the acid sol-gel method and the impregnation or the co-precipitation, the structures and DeSOx activities of whom were characterized by XRD, TG-DTA, BET and Microevaluation. It showed that the Mn-MgAl spinel produced by the impregnation had better sulfur transfer performance compared to that by the acid sol-gel method. The accumulated desulfurization in the first5minutes (ADeSOx-5min) was up to80.32%and the desulfurization capacity was5.47×104μg/g when the Mn content is5%. The ADeSOx-5min was changed with the Mn/Mg ratio in the compounded MnMgAl oxide and came to the highest84.29%and the desulfurization capacity was6.32×104μg/g when Mn/Mg is0.3. The introduction of Ce improved desulfurization performance that the ADeSOx-5min came to86.11%and desulfurization capacity to6.36×104μg/g.