Promotional Effects of Nd2O3 Doped Ni/Al2O3-Y2O3 Catalysts on Oxygen Vacancy and Coking-Resistant in Dry Reforming of Methane

The CO2 utilization is a significant issue due to the rigorous greenhouse effect, and the major bottleneck of methane dry reforming reaction is carbon deposition. Nd2O3 promoted Ni-based catalysts have ample oxygen vacancies, which could promote the decomposition of carbon dioxide into CO and O* species and thus may perform a favorable anti-coking ability to overcome this difficulty, and Ni/Al2O3-Y2O3-x%Nd2O3 (x =0, 2, 2.5, 3, 3.5, 4) catalysts were synthesized by sol-gel method and employed in DRM. The XRD, BET, TEM, TG, CO2-TPD and XPS were used to characterize the morphology and physicochemical properties of the prepared samples, confirming the Nd2O3 addition in Ni/Al2O3-Y2O3 catalysts behaved abundant oxygen vacancies, increased basicity of the support, mesoporous structures with small metallic Ni particle size, and high dispersion of Ni. Moreover, the catalytic performances were evaluated in a fixed bed tubular reactor, and the experimental results indicated Ni/Al2O3-Y2O3-3%Nd2O3 demonstrated an outstanding activity and stability at 800 degrees C owing to both inhibition of carbon deposition and Ni agglomeration, which was largely due to the sufficient oxygen vacancies. [GRAPHICS] .