Ni-pd dual active site synergistic low nh3 generation twc catalyst, and preparation method and application thereof

Abstract

The application relates to a Ni-Pd double-activity-site synergistic low-NH3-generation TWC catalyst and a preparation method and application thereof, and belongs to the technical field of tail gas purification catalyst materials. The TWC catalyst is composed of a carrier and a coating material; the coating material comprises a catalytic carrier material and a Pd@C / Ni precursor, Pt and Rh supported on the catalytic carrier material; the Pd@C / Ni precursor comprises a Pd@C core-shell structure material with a carbon layer uniformly coated on the Pd@C core-shell structure material, and Ni uniformly supported on the outer surface of the Pd@C core-shell structure material, with Ni active sites corresponding to the outer side of a single Pd core; in the Pd@C core-shell structure material, Pd is the inner core, and C is a carbon shell layer uniformly and completely coated on the Pd core. The application precisely controls the spatial distribution of Ni and Pd sites through the core-shell structure, strengthens the synergistic effect of the bimetal, reduces the generation of NH3 from the source, and simultaneously realizes the efficient and synchronous purification of CO, CH4 and NO x .

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