Increasing number of CNG vehicles on road emits considerable amount of CO, a poisonous gas and CH₄, a greenhouse‐gas. Highly active and oxygen‐deficient NiCo₂O_4‐δ spinel and its individual metal‐oxides were synthesized by calcination of precipitated/co‐precipitated basic‐carbonates followed by calcination under different strategies of stagnant air(s), flowing air(f) and reactive calcination(RC) for total oxidation of CO‐CH₄ mixture. The catalysts were characterized by XRD, XPS, BET surface‐area, SEM‐EDX and TEM. The performance order of the catalysts for the oxidation of CO‐CH₄ mixture was as follows: NiCo_RC>NiCo_f>NiCo_s>Co_RC>Co_f>Co_s>Ni_RC> Ni_f>Ni_s. The pairing of Ni and Co in spinel‐structure together with RC produced catalyst was oxygen‐deficient highly active for total oxidation of the mixture at the lowest temperature of 350°C. The NiCo_RC was found stable under reaction‐conditions for 50h at 350°C and after four successive heating (350°C)‐cooling (35°C) cycles besides accelerated‐aging tests up to 600°C. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2632–2646, 2018

中文翻译：

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活性NiCo2O4-δ尖晶石催化剂的设计，用于减少CNG燃料汽车产生的CO-CH4排放

道路上的CNG车辆数量不断增加，排放出大量的CO，有毒气体和CH ₄（温室气体）。高活性和缺氧的NiCo ₂ O4 _-δ尖晶石及其各个金属氧化物是通过沉淀/共沉淀的碱式碳酸盐的煅烧，然后在不同的空气，流动的空气（f）策略下煅烧而合成的以及反应煅烧（RC）来完全氧化CO-CH ₄混合物。通过XRD，XPS，BET比表面积，SEM-EDX和TEM对催化剂进行了表征。氧化CO-CH ₄混合物的催化剂的性能顺序如下：NiCo _RC > NiCo _f > NiCo _s > Co_RC > Co _f > Co _s > Ni _RC > Ni _f > Ni _s。尖晶石结构中的Ni和Co与RC生成的催化剂配对时，缺氧的活性很高，可在最低温度350°C下对混合物进行完全氧化。NiCo _RC在350°C的反应条件下可保持50h的稳定状态，并经过连续四个加热（350°C）-冷却（35°C）的循环后，除了加速老化试验，最高可达到600°C。©2018美国化学工程师学会AIChE J，64：2632–2646，2018