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

TiO2 Coating Strategy for Robust Catalysis of the Metal–Organic Framework toward Energy-Efficient CO2 Capture

“…The overall fabrication of SZC@TiO 2 from ZIF-67 is presented in Figure a. In this method, micrometer-scale ZIF-67 crystals were first synthesized using a slightly modified sonochemical synthetic method at room temperature. , The crystals exhibited a high crystallinity and high specific surface area (1296 m 2 ·g –1 ; Table S1). ZC@TiO 2 was then obtained using a versatile kinetics-controlled coating and facile carbonization method, which involved the following: The TiO 2 coating was homogeneously deposited onto the ZIF-67 crystals, filling the interior space of the mesoporous ZIF-67 networks and forming TiO 2 /ZIF-67 hybrid core–shell structures. The ZC@TiO 2 spheres with Co–N x sites derived from the carbonization of TiO 2 /ZIF-67 were obtained at a low temperature of 450 °C under argon. …”

“…In this method, micrometer-scale ZIF-67 crystals were first synthesized using a slightly modified sonochemical synthetic method at room temperature. 32,33 The crystals exhibited a high crystallinity and high specific surface area (1296 m 2 •g −1 ; Table S1). ZC@ TiO 2 was then obtained using a versatile kinetics-controlled coating and facile carbonization method, 34 which involved the following:…”

Construction of Confined Bifunctional 2D Material for Efficient Sulfur Resource Recovery and Hg2+ Adsorption in Desulfurization

“…However, the slow oxidation rate of MgSO 3 always leads to a low sulfate concentration approximately 10 wt %, resulting in more than three-quarters of water in the slurry that needs to be evaporated to crystallize sulfate due to the high solubility of MgSO 4 ·7H 2 O (equaling to approximately 32 wt % at 45 °C) . The impractical energy penalty up to 8.00 GJ/ton of this dehydration process inhibits the sustainable utilization of sulfur resources, thus the yellow mud byproduct (mainly MgSO 3 ) is mostly abandoned and not recycled . The effluent of magnesium sulfite slurry might reemit SO 2 and cause water pollution by consuming the dissolved oxygen. , Moreover, another environmental risk that was always neglected is the coexisting aqueous Hg 2+ in the slurry, which is difficult to remove by conventional alkaline precipitation owing to the presence of large amounts of soluble Mg 2+ .…”

“…The impractical energy penalty up to 8.00 GJ/ton of this dehydration process inhibits the sustainable utilization of sulfur resources, thus the yellow mud byproduct (mainly MgSO 3 ) is mostly abandoned and not recycled . The effluent of magnesium sulfite slurry might reemit SO 2 and cause water pollution by consuming the dissolved oxygen. , Moreover, another environmental risk that was always neglected is the coexisting aqueous Hg 2+ in the slurry, which is difficult to remove by conventional alkaline precipitation owing to the presence of large amounts of soluble Mg 2+ . Particularly, Hg 2+ can be reduced to Hg 0 by the excess MgSO 3 to introduce extensive re-emission issues and damage the quality of product MgSO 4 . − …”

“…In the previous research, we have confirmed that the synergetic oxidation reaction and mercury removal were controlled by both the properties of scaffold materials (e.g., pore structure, specific surface area, etc.) and dispersion of active sites. , Heterogeneous Co-based catalyst (especially compare with other transition metals), such as Co-SBA15, Co-TiO 2 , and Mn@ZIF67, etc. featuring 3D mesoporous and dispersed Co sites, were effective candidates to break through the balance via accelerating the free radical reaction and sulfite oxidation process.…”