This invention belongs to the field of catalyst technology, specifically relating to a multi-
metal-doped
cerium oxide catalyst and its preparation and application. The catalyst comprises a γ-Al₂O₃ support and an
active component supported thereon, wherein the
chemical formula of the
active component is Ni. a Fe b Ru c Co d Ce1 a b c d O 2‑δ Wherein, 0.05≤a≤0.1, 0.04≤b≤0.06, 0.04≤c≤0.06, 0≤d≤0.06, and a+b+c+d≤0.2. The catalyst is prepared by solution impregnation, by preparing a
metal salt solution and impregnating it on a γ-Al2O3 support to obtain a
sol with a complexing agent, which is then aged, dried, and calcined in stages. The catalyst is used in the
steam reforming reaction of
aviation kerosene (n-
dodecane simulation), and can achieve 100% catalytic conversion at 700 °C, without deactivation after 100 h of
continuous operation, exhibiting low-temperature activity and anti-
carbon deposition performance; wherein Ni 0.05 Fe 0.05 Ru 0.05 Co 0.05 Ce 0.8 O 2‑δ When reformed gas drives a
tubular solid oxide fuel cell, the
power density reaches 830.90 mW / cm³. 2 It operates stably for 100 hours without significant degradation. The process of this invention is simple and cost-controllable, and it is applicable to the fields of
hydrogen production from
aviation kerosene reforming and SOFC coupled power generation.