催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (5): 816-820.DOI: 10.1016/S1872-2067(10)60201-X

• 研究论文 • 上一篇    下一篇

Simulation of N2O Abatement in Waste Gases by Its Decomposition over a K-Promoted Co-Mn-Al Mixed Oxide Catalyst

Lucie OBALOVÁ1,*, Květuše JIRÁTOVÁ2, Kate?ina KARÁSKOVÁ1, František KOVANDA3   

  1. 1Faculty of Metallurgy and Materials Engineering, VŠB-Technical University of Ostrava, 17. Listopadu 15, Ostrava, Czech Republic; 2Institute of Chemical Process Fundamentals of the ASCR, v.v.i., Rozvojová 135, Prague, Czech Republic; 3Institute of Chemical Technology, Prague, Technická 5, Prague, Czech Republic
  • 收稿日期:2010-11-16 修回日期:2011-01-13 出版日期:2011-05-31 发布日期:2014-09-29

Simulation of N2O Abatement in Waste Gases by Its Decomposition over a K-Promoted Co-Mn-Al Mixed Oxide Catalyst

Lucie OBALOVÁ1,*, Květuše JIRÁTOVÁ2, Kate?ina KARÁSKOVÁ1, František KOVANDA3   

  1. 1Faculty of Metallurgy and Materials Engineering, VŠB-Technical University of Ostrava, 17. Listopadu 15, Ostrava, Czech Republic; 2Institute of Chemical Process Fundamentals of the ASCR, v.v.i., Rozvojová 135, Prague, Czech Republic; 3Institute of Chemical Technology, Prague, Technická 5, Prague, Czech Republic
  • Received:2010-11-16 Revised:2011-01-13 Online:2011-05-31 Published:2014-09-29

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摘要： Intrinsic data of N2O catalytic decomposition over a K-promoted Co-Mn-Al mixed oxide prepared by the thermal treatment of a layered double hydroxide was used for the design of a pilot reactor for the abatement of N2O emissions from the off-gases in HNO3 production. A pseudo-homogeneous one-dimensional model of an ideal plug flow reactor under an isothermal regime (450 °C) was used for reactor design. A catalyst particle diameter of 3 mm is a compromise size because increasing the size of the catalyst particle leads to a decrease in the reaction rate because of an internal diffusion limitation, and particles with a smaller diameter cause a large pressure drop. A catalyst bed of 11.5 m3 was estimated for the target N2O conversion of 90% upon the treatment of 30000 m3/h of exhaust gas (0.1 mol% N2O, 0.005 mol% NO, 0.9 mol% H2O, 5 mol% O2) at 450 °C and 130 kPa.

关键词: nitrous oxide, catalytic decomposition, nitric acid production, emission abatement

Abstract: Intrinsic data of N2O catalytic decomposition over a K-promoted Co-Mn-Al mixed oxide prepared by the thermal treatment of a layered double hydroxide was used for the design of a pilot reactor for the abatement of N2O emissions from the off-gases in HNO3 production. A pseudo-homogeneous one-dimensional model of an ideal plug flow reactor under an isothermal regime (450 °C) was used for reactor design. A catalyst particle diameter of 3 mm is a compromise size because increasing the size of the catalyst particle leads to a decrease in the reaction rate because of an internal diffusion limitation, and particles with a smaller diameter cause a large pressure drop. A catalyst bed of 11.5 m3 was estimated for the target N2O conversion of 90% upon the treatment of 30000 m3/h of exhaust gas (0.1 mol% N2O, 0.005 mol% NO, 0.9 mol% H2O, 5 mol% O2) at 450 °C and 130 kPa.

Key words: nitrous oxide, catalytic decomposition, nitric acid production, emission abatement