Effect Of Al3+/clay Ratio On C3H6-SCR Over Iron Catalysts Supported On Aluminum Pillared Montmorillonite (FE-AL-PILC) | 96266
Journal of Environmental Analytical Chemistry
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Iron based catalysts supported on aluminum pillared montmorillonite (Fe-Al-
PILC) were prepared. The methods including XRD, H2-TPR, Py-FTIR, Uv-Vis
spectroscopy, ICP, N2 adsorption-desorption, etc. were used to characterize the
basic physical and chemical properties of the catalysts. The characteristics of
selective catalytic reduction of NO by propylene on the catalyst surface were studied
experimentally in a fixed-bed reactor, and the effect of the Al3+/clay ratios on the
physicochemical properties of the catalyst and the SCR-C3H6 was investigated. The
results show that 9Fe/Al-PILC has higher SCR-C3H6 denitrification performance,
e.g., 100% of NO conversion to N2 was tested over 400°C. The Al3+/clay ratio plays
more important role on NO conversion than the calcination temperature of the
carrier. According to the Al3+/clay ratios, the order of catalytic activity is 9Fe/
increased the specific surface area of the montmorillonite dramatically, and the
catalyst had micropores and mesoporous structures. When the Al3+/clay ratio was
10 mmol/g of the pillared montmorillonite had the best physicochemical property.
In the Fe/Al-PILC catalysts, the iron oxides are highly dispersed on the surface
of the support. H2-TPR shows that the reduction of Fe2O3 phase determines the
SCR activity of the catalyst. With the increase of Al3+/clay ratio, the reducing
temperature of the reducing process Fe3O4???Fe gradually increases. UV-Vis results
showed that Al3+ increased the oligomer FexOy, and the activity of the catalyst
was positively correlated with the oligomer FexOy. Py-IR results showed that both
Lewis acid and Bronsted acid were favorable for the selective catalytic reduction
of NO. The 9Fe/Al-PILC-10 catalyst had the best activity, which was related to its
higher Brønsted acid content.
Yaxin Su has received his PhD in Power Engineering and Thermophysics with a focus on combustion from Zhejiang University, China, in 2000. He worked in the Department of Chemical Engineering, University of Mississippi, USA as a Visiting Professor during 2006-2007. He is currently a Professor in the School of Environmental Science and Engineering, Donghua University, China. He has been involved in heat transfer, gas-solid suspension flow and separation, thermochemical conversion of solid fuels, such as pyrolysis and combustion of coal, biomass and waste sludge, pollutant emission control, such as NOx reduction, CO2 capture, etc. He has published three academic books and two textbooks, more than 100 journal articles and 50 international conference papers.