Propane　dehydrogenation　(PDH)　using　platinum-based　intermetallic　catalysts　is　an　important　approach　for　the　industrial　production　of　highly　value-added　propylene.　Nevertheless,　the　high　temperature　needed　for　PDH　inevitably　causes　deactivation　of　the　intermetallic　catalysts　due　to　phase　separation　or　particle　aggregation.　Herein,　we　showcase　that　a　Pt　shell　offers　a　promising　solution　to　protect　intermetallics　under　harsh　PDH　environments.　Through　selective　removal　of　the　surface　Zn　atoms,　a　core/shell　architecture　with　1-2　atomic　layers　of　Pt　coating　PtZn　intermetallic　nanoclusters　is　constructed.　No　deactivation　was　observed　within　an　80　h　long-term　stability　test　at　580　degrees　C　on　the　optimal　PtZn/Pt　catalyst,　affording　an　extremely　low　deactivation　rate　constant　of　0.0007　h-1.　Furthermore,　the　construction　of　the　PtZn/Pt　core/shell　promotes　the　catalytic　efficiency,　with　a　high　propylene　formation　rate　of　124.8　mol　of　C3H6　gPt　-1　h-1　that　surpasses　that　of　most　of　the　Pt-based　PDH　catalysts　reported.　Density　functional　theory　calculations　reveal　that　the　Pt　shell　plays　dual　roles　in　stabilizing　the　intermetallic　core　and　modifying　the　electronic　structure　of　the　ensemble　by　inducing　a　compressive　strain.　This　lattice　strain　downshifts　the　d-band　center　to　a　lower　value　of　-3.02　eV　and　decreases　propylene　desorption　energy　to　a　level　lower　than　the　barrier　energy　of　C-H　breaking　by　0.66　eV,　resulting　in　enhanced　coking　resistance　and　reactivity.