title: Particulate Formation from a Copper Oxide-Based Oxygen Carrier in Chemical Looping Combustion for CO2Capture.
abstract: Attrition behavior and particle loss of a copper oxide-based oxygen carrier from a methane chemical looping combustion (CLC) process was investigated in a fluidized bed reactor. The aerodynamic diameters of most elutriated particulates, after passing through a horizontal settling duct, range between 2 and 5 μm. A notable number of submicrometer particulates are also identified. Oxygen carrier attrition was observed to lead to increased CuO loss resulting from the chemical looping reactions, i.e., Cu is enriched in small particles generated primarily from fragmentation in the size range of 10-75 μm. Cyclic reduction and oxidation reactions in CLC have been determined to weaken the oxygen carrier particles, resulting in increased particulate emission rates when compared to those of oxygen carriers without redox reactions. The generation rate for particulates <10 μm was found to decrease with progressive cycles over as-prepared oxygen carrier particles and then reach a steady state. The surface of the oxygen carrier is also found to be coarsened due to a Kirkendall effect, which also explains the enrichment of Cu on particle surfaces and in small particles.
authors.affiliation: Department of Chemical and Biomolecular Engineering, North Carolina State University , 911 Partners Way, Raleigh, North Carolina 27695-7905, United States.
authors.forename: Feng
authors.initials: F
authors.lastname: He
authors.affiliation: National Risk Management Research Laboratory, U.S. Environmental Protection Agency , 109 T.W. Alexander Drive, Research Triangle Park, North Carolina 27709-0002, United States.
authors.forename: William P
authors.initials: WP
authors.lastname: Linak
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Research Academy of Environmental Sciences , Beijing 100012, China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Deng
authors.affiliation: Department of Chemical and Biomolecular Engineering, North Carolina State University , 911 Partners Way, Raleigh, North Carolina 27695-7905, United States.
authors.forename: Fanxing
authors.identifier: 0000-0002-6757-1874
authors.initials: F
authors.lastname: Li
mesh_terms: D002245:Carbon Dioxide; D003300:Copper; D008697:Methane; D010084:Oxidation-Reduction; D010100:Oxygen
chemical_list: D002245:Carbon Dioxide; D003300:Copper; D008697:Methane; D010100:Oxygen