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- Title
Development of Mn/Mg-copromoted carbide slag for efficient CO2 capture under realistic calcium looping conditions.
- Authors
Ma, Xiaotong; Li, Yingjie; Zhang, Chunxiao; Wang, Zeyan
- Abstract
• Mn/Mg-copromoted carbide slag is produced using dolomite and trace Mn(NO 3) 2. • MgO acts as skeleton and Mn acts as an electron-transfer promoter for CO 2 capture. • The optimal MnO 2 content in the Mn/Mg-copromoted carbide slag is 0.75 %. • MnO 2 positively affects the diffusion-controlled stage of carbonation. • The optimal Mn/Mg-copromoted carbide slag captures 0.52 g CO 2 /g after 10 cycles. Loss-in-capacity of carbide slag in CO 2 capture restricts the development of industrial wastes in calcium looping technology. In this work, a novel Mn/Mg-copromoted carbide slag was prepared using carbide slag, dolomite and trace Mn(NO 3) 2 additive. Experimental tests were carried out in the fixed-bed reactor to evaluate how the preparation and the reaction conditions influenced the CO 2 capture performance of Mn/Mg-copromoted carbide slag during calcination/carbonation cycles. Results show that MgO diminishes the sintering of synthetic sorbents. The optimal Mn/Mg-copromoted carbide slag (mass ratio of CaO:MgO:MnO 2 = 89:10:1) exhibits the highest CO 2 capture capacity of 0.52 g/g after 10 cycles under the severe calcination condition (100 % CO 2 , 950 °C) and the wet carbonation condition (15 % CO 2 /20 % steam/N 2), which is 1.7 times as high as that of untreated carbide slag. MnO 2 positively affects the slow carbonation stage by enhancing the electron transfer between CaO and CO 2. Observations of the morphology of Mn/Mg-copromoted carbide slag indicate that the stabilized CO 2 capture performance is mainly attributed to porous structure, MgO as the skeleton and MnO 2 as an electron-transfer promoter.
- Subjects
FISCHER-Tropsch process; CARBIDES; INDUSTRIAL wastes; SLAG; CALCIUM; CHARGE exchange; INDUSTRIALIZATION
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2020, Vol 141, p380
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2020.05.051