Highly Dispersed NixGay Catalyst and La2O3 Promoter Supported by LDO Nanosheets for Dry Reforming of Methane: Synergetic Catalysis by Ni, Ga, and La2O3

A highly active and stable Ni-based catalyst is the focal point for research on dry reforming of methane (DRM). Here, Ni_xGa_y/La₂O₃-LDO catalysts composed of highly dispersed Ni_xGa_y and La₂O₃ nanoparticles supported by the MgO/Al₂O₃ layered double oxide (LDO) nanosheets were synthesized by chemical methods. According to transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), CO₂-TPD, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermal gravitational analysis (TGA), a synergistic reaction mechanism was proposed to explain the superior performance of the Ni_0.8Ga_0.2/La₂O₃-LDO catalyst. The Ni_xGa_y alloy catalyst provides an effective way to balance the speed of CH₄ cracking and CO₂ disassociation, and the La₂O₃ promoter enriched the CO₂ and ensured the generation of active O in time. They worked together to inhibit carbon accumulation and significantly improve the catalyst's activity and stability.