Noble　metal　nanoparticles　have　attracted　considerable　attention　due　to　their　useful　capabilities　as　heterogeneous　catalysts.　However,　they　are　usually　prepared　using　various　organic　stabilizing　agents　that　negatively　affect　their　catalytic　activities.　Herein,　we　report　a　facile,　clean,　and　effective　method　for　synthesizing　supported　ultrafine　noble　metal　nanoparticles　by　utilizing　the　reductive　property　of　a　new　pyrochlore　oxide:　Sn1.06Nb2O5.59F0.97　(SnNbOF).　Ultrafine　Au,　Pd,　and　Pt　nanoparticles　or　clusters　are　homogeneously　distributed　on　the　SnNbOF　surface.　In　addition,　the　atomic　cavities　and　ion-exchange　properties　of　pyrochlore-type　SnNbOF　can　facilitate　the　synthesis　of　atomic　Ag　dispersed　within　the　framework　of　SnNbOF.　Noble　metal-SnNbOF　hybrids　can　be　obtained　in　one　step　at　room　temperature,　and　no　foreign　reducing　agents　or　stabilizing　organics　are　required　for　the　synthesis.　We　also　show　that　the　fabricated　hybrids　exhibit　promising　photocatalytic　properties　for　ethylene　oxidation　and　CO2　reduction.　©　2018　American　Chemical　Society.