Contents lists available at ScienceDirect Fuel journal homepage: www.elsevier.com/locate/fuel Full Length Article Solution combustion synthesis of zirconia-stabilized calcium oxide sorbents forCO 2 capture Seyed Mojtaba Hashemi, Davood Karami, Nader Mahinpey ⁎ Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada GRAPHICALABSTRACT ARTICLEINFO Keywords: CO 2 capture Calcium looping Solution combustion synthesis Solids sorbents ABSTRACT CalciumloopingprocesshasnotyetbeencommercializedduetochallengesassociatedwiththeactivitylossofCaO sorbentsresultingfromsinteringoftheparticlesincyclicoperations.Inthepresentstudy,zirconia-stabilizedcalcium oxide sorbents have been developed through the solution combustion synthesis (SCS) method. The efects of pre- parationconditions(percentageofZrstabilizerandfuel-to-metaloxideratio)ontheCO 2 captureperformancewere investigatedinathermogravimetricanalyzer.Sorbentswith20%calciumzirconatestabilizerandhighfuel-to-metal oxideratioexhibitedanoptimalcombinationofCO 2 uptakecapacityandstability.Increasingthefuelratioimproved theCO 2 uptake capacity due to higher surface area and smaller particle size of the synthesized sorbents. However, increasingtheratiobeyondsixdidnothaveanysignifcantimpactontheperformanceofthesorbent.Basedonthe results, the optimum fuel-to-metal oxide ratio for synthesis was six times the stoichiometric ratio. Two sorbents showingthebestresults(S20-4xandS20-6x)weretestedin50-cycleexperimentsundermildandharshcalcination conditions for long-term stability assessment. Sorbents displayed high uptake capacity (7.7 and 8.8 mol/kg, re- spectively, under mild conditions; and 5.0 and 6.5 mol/kg respectively, under harsh conditions) after 50 cycles, whichisasignifcantimprovementovertheuptakeofthebenchmarklimestone(4.1and1.7mol/kgundermildand harsh conditions, respectively). Based on the results, Zr-stabilized sorbents prepared from solution combustion synthesis method are promising materials for calcium looping CO 2 capture. https://doi.org/10.1016/j.fuel.2020.117432 Received 3 December 2019; Received in revised form 16 February 2020; Accepted 18 February 2020 ⁎ Corresponding author. E-mail address: nader.mahinpey@ucalgary.ca (N. Mahinpey). Fuel 269 (2020) 117432 0016-2361/ © 2020 Elsevier Ltd. All rights reserved. T