title: Development of a Steel-Slag-Based, Iron-Functionalized Sorbent for an Autothermal Carbon Dioxide Capture Process.
abstract: We propose a new class of autothermal CO2 -capture process that relies on the integration of chemical looping combustion (CLC) into calcium looping (CaL). In the new process, the heat released during the oxidation of a reduced metallic oxide is utilized to drive the endothermic calcination of CaCO3 (the regeneration step in CaL). Such a process is potentially very attractive (both economically and technically) as it can be applied to a variety of oxygen carriers and CaO is not in direct contact with coal (and the impurities associated with it) in the calciner (regeneration step). To demonstrate the practical feasibility of the process, we developed a low-cost, steel-slag-based, Fe-functionalized CO2 sorbent. Using this material, we confirm experimentally the feasibility to heat-integrate CaCO3 calcination with a Fe(II)/Fe(III) redox cycle (with regards to the heat of reaction and kinetics). The autothermal calcination of CaCO3 could be achieved for a material that contained a Ca/Fe ratio of 5:4. The uniform distribution of Ca and Fe in a solid matrix provides excellent heat transfer characteristics. The cyclic CO2 uptake and redox stability of the material is good, but there is room for further improvement.
authors.affiliation: School of Environment, Tsinghua University, 100084, Beijing, P.R. China.
authors.forename: Sicong
authors.identifier: http://orcid.org/0000-0003-1891-5885
authors.initials: S
authors.lastname: Tian
authors.affiliation: School of Environment, Tsinghua University, 100084, Beijing, P.R. China. jianguoj@tsinghua.edu.cn.|Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, 100084, Beijing, P.R. China. jianguoj@tsinghua.edu.cn.|Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, 100084, Beijing, P.R. China. jianguoj@tsinghua.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Jiang
authors.affiliation: Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092, Zürich, Switzerland.
authors.forename: Davood
authors.initials: D
authors.lastname: Hosseini
authors.affiliation: Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092, Zürich, Switzerland.
authors.forename: Agnieszka M
authors.initials: AM
authors.lastname: Kierzkowska
authors.affiliation: Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092, Zürich, Switzerland.
authors.forename: Qasim
authors.initials: Q
authors.lastname: Imtiaz
authors.affiliation: Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092, Zürich, Switzerland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Broda
authors.affiliation: Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092, Zürich, Switzerland.
authors.forename: Christoph R
authors.initials: CR
authors.lastname: Müller
mesh_terms: D000327:Adsorption; D017610:Calcium Compounds / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D013232:Steel / Q000737:chemistry*; D013696:Temperature
chemical_list: D017610:Calcium Compounds; D007220:Industrial Waste; D010087:Oxides; D013232:Steel; D002245:Carbon Dioxide; C016538:lime; D007501:Iron
keywords: autothermal; calcium; carbon (dioxide) capture; iron; waste prevention