Abstract: Aiming at the difficuly of accurately constructing nanomultiple interface ofmulti-component solid catalysts, given the extremely high lattice match between hexagonal cobalt(II) oxide (hcp-CoO) and zinc oxide (ZnO)(>99.8%),the Pt-ZnO@CoO ternary catalyst was was designed and synthesized using lattice mathing strategy for targeted construction of ternary interface. The morphology, elemental distribution, phase structure, elemental content, reduction capability, and adsorption capacity of the catalystwere characterized by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), hydrogen programmed temperature reduction (H₂-TPR) and carbon dioxide programmed temperature desorption (CO₂-TPD), then its catalytic performance for CO₂ hydrogenationwas evaluated in a fixed-bed reactor. The results showed that Co and Pt were highly dispersed on the surface ofPt-ZnO@CoO catalyst, and the precursors of CoO and Pt were reduced to nano-particles after reduction treatment. The Pt-ZnO@CoO catalyst exhibits excellent catalytic performance and stability for CO₂ hydrogenation, this is because of its high density of the interface sites, strong reduction ability and strong CO₂ adsorption capacity.

Key words: ternary interface, Pt-Co catalyst, CO₂ hydrogenation, lattice matching