Development of highly efficient double-substituted perovskite catalysts for abatement of diesel soot emissions

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• 作者：Anupama Mishra ; R. Prasad
• 关键词：Diesel soot emission ; Perovskite catalyst ; Substituted perovskite ; Soot oxidation ; Reactive calcination
• 刊名：Clean Technologies and Environmental Policy
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：17
• 期：8
• 页码：2337-2347
• 全文大小：1,401 KB
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• 作者单位：Anupama Mishra (1)
  R. Prasad (1)
  
  1. Department of Chemical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India
  
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Industrial Chemistry and Chemical Engineering
  Industrial Pollution Prevention
  Environmental Economics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-9558

文摘

Strontium-substituted LaCoO₃ and double-substituted La_0.9Sr_0.1CoO₃ by Cu, Fe and Ni perovskite catalysts were prepared via citric acid sol–gel method. The precursors were calcined at 750 °C in stagnant air. The precursor of the catalyst showing the best activity for soot oxidation was also reactively calcined in a flowing reactive mixture of 4.6 % CO in air at 750 °C. The catalysts were characterized by N₂-sorption, XRD, FTIR and SEM. The substitution of Sr in LaCoO₃ enhanced the activity of the catalyst. Further, increase in the activities of the catalysts was observed for double substitution of Cu, Ni and Fe in La_0.9Sr_0.1CoO₃. The catalyst formulation La_0.9Sr_0.1Co_0.5Fe_0.5O₃, calcined in air (Cat-5A) and reactively calcined (Cat-5B), showed higher activities than other four optimized catalysts composition calcined in air. Cat-5B exhibited the best activity resulting in total soot combustion at the lowest temperature of 325 °C. The best performance of Cat-5B was associated with its partially reduced perovskite phase as a result of reactive calcination leading to lattice vacancies and defects. Cat-5B has good thermal stability found in a repeated cycles of soot combustion experiments. Keywords Diesel soot emission Perovskite catalyst Substituted perovskite Soot oxidation Reactive calcination