4.5 Article

Microwave-Pyrolysis-Assisted Preparation of Magnetic Iron-Titanium Mixed Oxide Catalyst for Selective Catalytic Reduction of NOx with NH3

期刊

CLEAN-SOIL AIR WATER
卷 45, 期 11, 页码 -

出版社

WILEY
DOI: 10.1002/clen.201700231

关键词

gamma-Fe2O3; microwave-pyrolysis; NOx reduction; titanium oxide; selective catalysis

资金

  1. National Science Foundation of China [51406118]
  2. Shanghai Basic Research Foundation [14JC1404800]
  3. Program of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [QD2015017]
  4. Key Laboratory of Flow Control and Simulation [D15013]

向作者/读者索取更多资源

A kind of magnetic iron-titanium oxide catalyst for selective catalytic reduction (SCR) of NOx with NH3 is obtained by the microwave-pyrolysis coprecipitation method. This catalyst is characterized in detail by various techniques such as X-ray diffraction, N-2 adsorption-desorption, X-ray photoelectron spectroscopy, temperature-programmed reduction of H-2, and temperature-programmed desorption of NH3/NO to investigate the influence of titanium oxide addition on the NH3-SCR activity of magnetic iron oxide. Furthermore, the NH3-SCR reaction mechanism over magnetic iron-titanium oxide is also revealed. The NH3-SCR activity over magnetic iron oxide is enhanced by the addition of titanium oxide, especially the low-temperature activity. The addition of titanium oxide depresses the oxidization of gamma-Fe2O3 to alpha-Fe2O3 in the precursor obtained through microwave-pyrolysis coprecipitation during the aging process, and also reduces the absorption ability of SO42- to the precursor. The crystallite of iron oxide in magnetic Fe1-xTixOz- 500 (x = 0.25, 0.5, and 0.75) catalysts is mainly gamma-Fe2O3. Among these magnetic catalysts, magnetic Fe0.75Ti0.25Oz-500 has two distinctive peaks in the pore size distribution curve and more active iron-based sites on its surface for NH3-SCR reaction. This catalyst shows the highest NH3-SCR activity. The NH3-SCR reaction over magnetic Fe0.75Ti0.25Oz-500 at lowtemperature obeys both the Eley-Rideal mechanism and the LangmuirHinshelwood mechanism.

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