Precise control of Pt encapsulation in zeolite-based catalysts for a stable low-temperature CO oxidation reaction

Metal–zeolite catalysts are vital in chemical and fuel production for their great stability,stereo-selectivity,and atom economy.When metal species keep shrinking their sizes to the subnanometer region,their spatial distribution in the zeolite framework/channels could have a great impact on their catalytic performance.Here,we precisely control the Pt species loaded on a silicalite-1 zeolite and characterize their structural status to the catalytic performance for CO oxidation.We find that Pt species exits as few-atom clusters encapsulated in the channels and destructively embedded Pt nanoparticles in the framework,besides the conventional surface-supported Pt.By utilizing effective Pt sites and limiting their sizes in the zeolite,we can maximize the catalytic CO oxidation performance of 1 at.% Pt-loaded zeolite catalysts to achieve a T100 as low as 90 ℃ and a stable reaction above 216 h.