Superior energy-saving catalyst of Mn@ZIF67 for reclaiming byproduct in wet magnesia desulfurization

Catalyst for sulfite oxidation can substantially reduce the energy penalty on reclaiming the byproduct in wet magnesia desulfurization. Here we reported a novel self-assembled bimetallic catalyst, being accomplished by the in situ incorporation of Mn metal into the metal organic framework (MOF) structure to constitute Mn@ZIF67. The ultrahigh performance of Mn@ZIF-67 was attributed to its unique hollow structure and exposed active Co sites in the organic skeleton, allowing sufficient contact and diffusion of the reactants. Meanwhile, doping Mn in the MOF skeleton favored to enhance the interaction between Co and sulfite, thus promoting sulfite oxidation by 8.6-folder compared with un-catalysis. The critical mass concentration of magnesium sulfate was increased from 10% to 25%, thus reducing the heat consumption by approximately 75% for sulfate enrichment prior to crystallization. This study serves to cap the oxidation rate of sulfite in wet desulfurization, thus enabling the feasibility to reduce the energy penalty.