Journal
CHEMICAL ENGINEERING JOURNAL
Volume 280, Issue -, Pages 66-73Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.05.093
Keywords
Catalyst support; Fe/zeolites; NOx reduction; NOx adsorption; Propylene reductant
Categories
Funding
- National Natural Science Foundation of China [21006093]
- Natural Science and Engineering Research Council (NSERC) of Canada
- Fundamental Research Funds for the Central Universities
- China Scholarship Council (CSC)
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The effect of catalyst supports on NOx adsorption and reduction by C3H6 over Fe/zeolites was studied at a temperature range of 200-400 degrees C. NOx conversion over Fe/zeolites decreased in the order of Fe/MOR > Fe/FER approximate to Fe/ZSM-5 > Fe/Beta at low temperatures between 200 degrees C and 300 degrees C. At temperatures above 300 degrees C, the order of catalytic activity became Fe/Beta > Fe/FER > Fe/ZSM-5 > Fe/MOR. NOx adsorption capacities on Fe/zeolite catalysts decreased in the order of Fe/MOR > Fe/FER > Fe/ZSM-5 > Fe/Beta. The selective catalytic reduction (SCR) activity of zeolites showed a slight difference from 200 degrees C to 400 degrees C. The adsorption capacities of NO on zeolites placed within the rank of MOR > FER > ZSM-5 > Beta. No correlation was found between surface area/pore volume and NOx reduction/adsorption on Fe/zeolites. The ratio of Fe2+/Fe3+ in the surface layer of Fe/zeolites decreased in the order of Fe/Beta > Fe/FER > Fe/MOR > Fe/ZSM-5. The peak of Fe3O4 was clearly detected on Fe/Beta by TPR. The inhibition of the adsorption capacities of Fe/zeolites became severe in the presence of SO2, CO2, and H2O. CO2 exerted virtually no effect on the SCR activity of Fe/zeolites. The inhibition of NO conversion by H2O was reversible for all catalysts. NOx conversion dropped significantly on Fe/zeolites in the presence of 100 ppm SO2, 10% H2O, and 10% CO2. The Fe/MOR catalyst exhibited the strongest tolerance to SO2 among tested catalysts, showing its promise as a practical catalyst for lean-burn de-NOx in an internal circulating fluidized bed in the presence of low sulfur levels in exhaust gases. (C) 2015 Elsevier B.V. All rights reserved.
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