Synthesis gold and jade type core shell structure Pt@Sn in deboronated MWW zeolite and its good performance for light alkane dehydrogenation

The Pt@Sn core-shell structure was generated in MWW zeolite catalysts prepared by atom-planting incorporated Sn and deposition-precipitation (DP) loaded Pt for direct dehydrogenation of ethane or propane and CO2 oxidative dehydrogenation. The introduced Sn species can immobilize cubic structure Pt nanoparticle with well dispersed particles by DP method through the charge's attraction. The stronger charge transfer between Pt-Sn improves the catalyst activity for the C-H band breaking of alkane. The zeolite skeleton incoporated Sn formed Sn-O-Si bond and can be broken to be extracted from the zeolite structure as SnO2 under the dehydrogenation process. The extracted SnO2 in the 'half-cup' external supercage encapsulates the Pt nanoparticle and forms the gold and jade type core-shell structure, which reduces the Pt agglomeration and modifies the Pt nanoparticle crystal edge and corner active sites and reduced the C-C band cleavage to side products and coke formation, thus improving the dehydrogenation selectivity and stability.