Journal
APPLIED SURFACE SCIENCE
Volume 406, Issue -, Pages 218-225Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.02.157
Keywords
Selective catalytic reduction of NOx; Iron-cerium-tungsten mixed oxide; Co-precipitation; Critic acid sol-gel; Hydrothermal treatment; Microwave irradiation
Categories
Funding
- National Science Foundation of China [51406118]
- Shanghai Basic Research Foundation(Key Program) [14JC1404800]
- Program of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [QD2015017]
- Key Laboratory of Flow Control and Simulation [D15013]
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A series of magnetic Fe0.85Ce0.10W0.05Oz catalysts were synthesized by three different methods(Co-precipitation(Fe0.85Ce0.10W0.05Oz-CP), Hydrothermal treatment assistant critic acid sol-gel method(Fe0.85Ce0.10W0.05Oz-HT) and Microwave irradiation assistant critic acid sol-gel method(Fe0.85Ce0.10W0.05Oz-MW)), and the catalytic activity was evaluated for selective catalytic reduction of NO with NH3. The catalyst was characterized by XRD, N-2 adsorption-desorption, XPS, H-2-TPR and NH3-TPD. Among the tested catalysts, Fe0.85Ce0.10W0.05Oz-MW shows the highest NO,, conversion over per gram in unit time with NOx conversion of 60.8% at 350 degrees C under a high gas hourly space velocity of 1,200,000 ml/(g h). Different from Fe0.85Ce0.10W0.05Oz-CP catalyst, there exists a large of iron oxide crystallite(gamma-Fe2O3 and alpha-Fe2O3) scattered in Fe0.85Ce0.10W0.05Oz catalysts prepared through hydrothermal treatment or microwave irradiation assistant critic acid sol-gel method, and higher iron atomic concentration on their surface. And Fe0.85Ce0.10W0.05Oz-MW shows higher surface absorbed oxygen concentration and better dispersion compared with Fe0.85Ce0.10W0.05Oz-HT catalyst. These features were favorable for the high catalytic performance of NO reduction with NH3 over Fe0.85Ce0.10W0.05Oz-MW catalyst. (C) 2017 Elsevier B.V. All rights reserved.
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