Reactivity of binuclear Fe complexes in over-exchanged Fe/ZSM5, studied by in situ XAFS spectroscopy 2. Selective catalytic reduction of NO with isobutane

Battiston, A.A.; Bitter, Johannes H.; Koningsberger, D.C.

doi:10.1016/s0021-9517(03)00120-9

Cited by 98 publications

(31 citation statements)

References 22 publications

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“…They argued that at high temperatures Fe 2þ might be reoxidized by oxygen from the zeolite matrix, as proposed by Voskoboinikov et al (92), which would therefore eliminate the observed inhibition. In fact, Battiston et al (93) observed a decrease in the oxidation state of iron from 2.9 to 2.3 after adding NH 3 to a gas feed containing exclusively NO in N 2 .…”

Section: Selective Catalytic Reduction Of No X By Ammoniamentioning

confidence: 99%

The State of the Art in Selective Catalytic Reduction of NO_xby Ammonia Using Metal‐Exchanged Zeolite Catalysts

Brandenberger

Kröcher

Tißler³

et al. 2008

Catalysis Reviews

772

617

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An overview is given of the selective catalytic reduction of NO x by ammonia (NH 3 -SCR) over metal-exchanged zeolites. The review gives a comprehensive overview of NH 3 -SCR chemistry, including undesired side-reactions and aspects of the reaction mechanism over zeolites and the active sites involved. The review attempts to correlate catalyst activity and stability with the preparation method, the exchange metal, the exchange degree, and the zeolite topology. A comparison of Fe-ZSM-5 catalysts prepared by different methods and research groups shows that the preparation method is not a decisive factor in determining catalytic activity. It seems that decreased turnover frequency (TOF) is an oft-neglected effect of increasing Fe content, and this oversight may have led to the mistaken conclusion that certain production methods produce highly active catalysts. The available data indicate that both isolated and bridged iron species participate in the NH 3 -SCR reaction over Fe-ZSM-5, with isolated species being the most active.

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Section: Selective Catalytic Reduction Of No X By Ammoniamentioning

confidence: 99%

The State of the Art in Selective Catalytic Reduction of NO_xby Ammonia Using Metal‐Exchanged Zeolite Catalysts

Brandenberger

Kröcher

Tißler³

et al. 2008

Catalysis Reviews

772

617

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“…Fe/ZSM-5 was widely reported in recent years to posses high effectiveness without the production of N 2 O and good resistance to H 2 O (Feng and Hall, 1997;Yamada et al, 1998;Kogel et al, 1999;Chen et al, 2000b;Battiston et al, 2003;Sobalik et al, 2002).…”

Section: Metal-exchanged Zeolitesmentioning

confidence: 99%

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

Yang

2009

Environ. Sci. Technol.

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In order to avoid the negative impact of excessive oxygen in the combustion flue gases on the selectivity of most hydrocarbon selective catalytic reduction (HC-SCR) catalysts, an integrated NO(x) adsorption-reduction process has been proposed in this study for the treatment of flue gases under lean burn conditions by decoupling the adsorption and reduction into two different zones. The hypothesis has been validated in a novel internal circulating fluidized bed (ICFB) reactor using Fe/ZSM-5 as the catalyst and propylene as the reducing agent. Effects of propylene to the NO(x) molar ratio, flue gas oxygen concentration, and gas velocity on NO(x) conversion were studied using simulated flue gases. The results showed that increasing the ratio of HC:NO improved the reduction performance of Fe/ZSM-5 in the ICFB reactor. NO(x) conversion decreased with an increasing flue gas flow velocity in the annulus U(A) but increased with an increasing reductant gas flow velocity in the draft tube U(D). The NO(x) adsorption ratio decreased with increasing U(A). In most cases, NO(x) conversion was higher than the adsorption ratio due to the relatively poor adsorption performance of the catalyst. Fe/ZSM-5 showed a promising reduction performance and a strong inhibiting ability on the negative impact of excessive O2 in the ICFB reactor, proving that such an ICFB reactor possessed the ability to overcome the negative impact of excessive O2 in the flue gas using Fe/ZSM-5 as the deNO(x) catalyst.

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“…Fe/ZSM-5 [1,[25][26][27][28][29], Fe/MCM-41 [30] and Fe/Al 2 O 3 [31,32], is often modelled by using bulk oxides such as α-Fe 2 O 3 neglecting the interaction of Fe with the support. As a consequence, large and strongly varying correction terms (such as the ΔE 0 ) are required to obtain a statistically reliable EXAFS fit.…”

Section: Introductionmentioning

confidence: 99%

Towards advanced structural analysis of iron oxide clusters on the surface of γ-Al2O3 using EXAFS

Boubnov

Roppertz

Kundrat

et al. 2016

Applied Surface Science

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Reactivity of binuclear Fe complexes in over-exchanged Fe/ZSM5, studied by in situ XAFS spectroscopy 2. Selective catalytic reduction of NO with isobutane

Cited by 98 publications

References 22 publications

The State of the Art in Selective Catalytic Reduction of NO_xby Ammonia Using Metal‐Exchanged Zeolite Catalysts

The State of the Art in Selective Catalytic Reduction of NO_xby Ammonia Using Metal‐Exchanged Zeolite Catalysts

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons

Towards advanced structural analysis of iron oxide clusters on the surface of γ-Al2O3 using EXAFS

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Reactivity of binuclear Fe complexes in over-exchanged Fe/ZSM5, studied by in situ XAFS spectroscopy 2. Selective catalytic reduction of NO with isobutane

Cited by 98 publications

References 22 publications

The State of the Art in Selective Catalytic Reduction of NOxby Ammonia Using Metal‐Exchanged Zeolite Catalysts

The State of the Art in Selective Catalytic Reduction of NOxby Ammonia Using Metal‐Exchanged Zeolite Catalysts

Novel Fluidized Bed Reactor for Integrated NOx Adsorption−Reduction with Hydrocarbons

Towards advanced structural analysis of iron oxide clusters on the surface of γ-Al2O3 using EXAFS

Contact Info

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Resources

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The State of the Art in Selective Catalytic Reduction of NO_xby Ammonia Using Metal‐Exchanged Zeolite Catalysts

The State of the Art in Selective Catalytic Reduction of NO_xby Ammonia Using Metal‐Exchanged Zeolite Catalysts

Novel Fluidized Bed Reactor for Integrated NO_x Adsorption−Reduction with Hydrocarbons