The invention belongs to the technical field of
flue gas desulfurization of the
petroleum refining industry and discloses a high-efficiency catalytic
cracking flue gas
sulfur-
transfer agent which has the
good reduction ability at the low temperature and a preparation process thereof. A mechanical dispersing
grinding high-specific-surface-area magnesia-
alumina source and other element compounds are used, and the high-dispersion and high-
sphericity-degree low-temperature reduced catalytic
cracking flue gas
sulfur-
transfer agent is obtained through a method comprising the steps of forming, screening,
roasting and hydration. According to the agent and the process, raw materials which are small in particle and large in specific surface area are preferred, and the produced catalytic
cracking flue gas sulfur-
transfer agent is uniform in particle and good in
metal ion dispersion, so that sulfur oxides can be attached to the surface of the sulfur-transfer agent in a good mode,
sulfate can be reduced at the low temperature (below 500 DEG C), the sulfur absorption of the sulfur-transfer agent is good in Sox adsorption capacity and oxidative sulfur
absorption rate, the reduction performance is good, the agent and the process are applicable to catalytic cracking devices having requirements for the reduction temperature, the reduction temperature is reduced, and effects of
energy conservation, emission reduction, low carbon and
environmental protection are achieved.