We　successfully　prepared　1.98　wt%　PtRu　nanoparticles　(NPs)　partially　embedded　in　the　skeleton　of　three-dimensionally　ordered　macroporous　Ce0.7Zr0.3O2　(denoted　as　1.98PtRu@3DOM　CZO)　using　the　poly-methyl　methacrylate-templating　and　ethylene　glycol　reduction　methods.　For　comparison　purposes,　we　also　synthesized　a　3DOM　CZO-supported　2.03　wt%　PtRu　catalyst　(denoted　as　2.03PtRu/3DOM　CZO)　via　a　colloidal　adsorption　route.　The　1.98PtRu@3DOM　CZO　sample　exhibited　better　performance　than　the　Pt　or　Ru　NPs　partially　embedded　in　the　skeleton　of　3DOM　CZO.　Ru　played　an　important　role　in　promoting　the　low-temperature　reducibility　and　oxygen　adsorption　ability　of　the　sample.　The　catalytic　activity　of　2.03PtRu/3DOM　CZO　was　better　than　that　of　1.98PtRu@3DOM　CZO　(Delta　T-90%　=　23　degrees　C)　for　toluene　combustion,　and　the　former　showed　lower　apparent　activation　energy　(45　kJ/mol).　However,　1.98PtRu@3DOM　CZO　possessed　excellent　thermal　stability,　over　which　the　activity　did　not　change　obviously,　while　that　over　2.03PtRu/3DOM　CZO　decreased　greatly;　furthermore,　the　catalytic　activity　of　the　former　was　superior　to　that　of　the　latter　after　calcination　at　800　degrees　C　for　5　h.　After　high-temperature　treatment,　the　average　particle　size　of　PtRu　NPs　in　1.98PtRu@3DOM　CZO　increased　slightly　from　4.2　to　6.7　nm,　whereas　that　of　PtRu　NPs　in　2.03PtRu/3DOM　CZO　increased　significantly　from　5.1　to　17.3　nm.　It　is　concluded　that　the　good　performance　of　1.98PtRu@3DOM　CZO　is　associated　with　its　highly　dispersed　partially　embedded　PtRu　NPs　and　good　toluene　and　oxygen　adsorption　ability,　since　the　embedded　structure　facilitated　formation　of　a　larger　amount　of　Pt-O-Ce-like　bonds　that　possessed　strong　interaction　between　PtRu　NPs　and　3DOM　CZO　and　hence　contributed　to　its　better　thermal　stability.　(C)　2020　Elsevier　Inc.　All　rights　reserved.