Mg(Al)O　mixed　oxide-supported　Co　catalysts　were　prepared　by　using　Co-Mg-Al　layered　double　hydroxides　(LDHs)　as　precursors　and　their　structural　and　catalytic　properties　for　CH4-CO2　reforming　were　studied.　Upon　calcination　and　reduction,　Co-Mg-Al　LDHs　were　decomposed　to　Mg(Co,　Al)0　mixed　oxides　and　gave　rise　to　highly　dispersed　Co　metal　particles　with　the　mean　size　of　similar　to　9-10　nm.　The　catalytic　activity,　stability,　and　coke　resistance　of　Co/MgAl　increased　with　the　increase　of　Co　loading.　The　12%-15%Co/Mg3Al　catalysts　showed　high　and　stable　activity　as　well　as　less　coke　deposition　during　30　h　of　reaction　at　1023　K.　Sintering　of　Co　particles　was　not　clearly　observed,　indicative　of　good　thermal　stability　of　Co　particles,　and　this　could　be　attributed　to　the　strong　metal-support　interaction　between　Co　particles　and　Mg(Al)O.　It　was　also　found　that　the　optimum　LDHs-Co/MgAl　catalyst　exhibited　superior　coke　resistance　than　the　LDHs-Ni/MgAl　catalyst.　Particularly　during　25　h　of　reaction　at　873　K,　the　12%Co/Mg3Al　catalyst　showed　much　higher　catalytic　stability　and　much　less　coke　deposition　as　compared　to　the　12%Ni/Mg3Al　catalyst,　highlighting　the　great　potential　of　using　Co　instead　of　Ni　as　an　active　catalyst　for　the　CH4-CO2　reforming.　(C)　2016　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.