The　Sabatier　process　is　promising　for　carbon　dioxide　utilization　and　energy　storage.　However,　the　serious　problem　that　limits　more　comprehensive　industrial　applications　is　catalyst　deactivation　due　to　the　temperature　runaway　phenomenon.　The　inert　particle　dilution　approach,　including　the　mixing　dilution　method　and　layered　dilution　method　is　applied　to　solve　this　problem.　Based　on　the　lattice　kinetic　scheme-lattice　Boltzmann　method　(LKS-LBM),　the　effects　of　three　parameters　in　bed　dilution　structure　reconstructed　by　the　discrete　element　method　(DEM)　on　temperature　distribution　and　carbon　conversion　rate　were　discussed,　so　as　to　investigate　the　relationship　between　packing　structure　and　temperature　distribution.　Furthermore,　numerical　results　indicated　that　an　optimal　bed　dilution　structure,　which　not　only　can　control　the　peak　temperature　below　the　critical　temperature　to　avoid　coking　and　sintering　of　catalyst,　but　also　can　improve　the　conversion　rate　by　almost　18%　compared　with　the　structure　without　dilution　under　the　same　circumstance.　©　2021　American　Institute　of　Chemical　Engineers.