Characterization of Fe/ZSM-5 DeNO  catalysts prepared by different methods: Relationships between active Fe sites and NH3-SCR performance

Iwasaki, M.; Yamazaki, Kiyoshi; Banno, Koji; Shinjoh, Hirofumi

doi:10.1016/j.jcat.2008.10.009

Cited by 256 publications

(163 citation statements)

References 51 publications

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“…Figure 1 shows the XRD pattern of Pd/ZSM-5 catalyst. The main diffraction peaks in this pattern correspond to those of pure ZSM-5 zeolite (Iwasaki et al 2008). Moreover, the physicochemical characteristics of Pd/ZSM-5 are summarized in Table 2.…”

Section: Catalytic Oxidation Activitiesmentioning

confidence: 91%

A Comprehensive Study of Deep Catalytic Oxidation of Benzene, Toluene, Ethyl Acetate, and their Mixtures over Pd/ZSM-5 Catalyst: Mutual Effects and Kinetics

Cheng

Hao

et al. 2009

Water Air Soil Pollut

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Reaction behaviors and kinetics of catalytic oxidation of benzene, toluene, and ethyl acetate with feed concentrations in the range of 700-5,000 ppm over Pd/ZSM-5 catalyst were investigated. Results for single components show that ethyl acetate (T 50 =190-200°C) is more easily oxidized than benzene (T 50 =215-225°C) and toluene (T 50 =225-235°C). The conversion of ethyl acetate was increased with the increase of its feeding concentration, while the opposite behaviors were observed for benzene and toluene as their conversion rates were decreased with the increase of the inlet concentration. Different behaviors were observed in catalytic oxidation of volatile organic compound (VOC) multi-components, the presence of benzene or toluene inhibits the conversion of ethyl acetate, and the aromatic hydrocarbons inhibit each other in all cases. Ethyl acetate possesses obvious inhibitory effect on benzene oxidation, while it is interesting to note that ethyl acetate has a promotion effect on toluene conversion. The kinetic data were fitted by the Power-law and Mars-van Krevelen kinetic models. The fitting result shows that the Power-law model is more suitable for predicting the conversion of benzene than the other VOCs, and the Mars-van Krevelen model can accurately express the reaction rate of all investigated VOCs.

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Section: Catalytic Oxidation Activitiesmentioning

confidence: 91%

A Comprehensive Study of Deep Catalytic Oxidation of Benzene, Toluene, Ethyl Acetate, and their Mixtures over Pd/ZSM-5 Catalyst: Mutual Effects and Kinetics

Cheng

Hao

et al. 2009

Water Air Soil Pollut

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“…the turnover frequency), but the microstructure of Fe species was. 10,98 Brandenberger et al 99 recently systematically studied the different Fe sites located in Fe-ZSM-5 catalysts including monomeric, dimeric, clustered and oligomeric species, and correlated them with the measured NH 3 -SCR activity (Scheme 3). They concluded that actually all Fe species in the Fe-ZSM-5 catalyst were active, although they exhibited different 99 in the above-mentioned study are generally useful for the design, synthesis and application of efficient Fe-zeolite catalysts.…”

Section: Nh 3 -Scr Of No X Over Zeolite Catalystsmentioning

confidence: 99%

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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Selective catalytic reduction of NO x using NH 3 or hydrocarbons (NH 3 -SCR or HC-SCR) in oxygen-rich exhaust from diesel engines remains a major challenge in environmental catalysis. The development of highly efficient, stable and environmentally-benign catalysts for SCR processes is very important for practical use. In this feature article, the structure-activity relationship of vanadium-free catalysts in the NH 3 -SCR reaction is discussed in detail, including Fe-, Ce-based oxide catalysts and Fe-, Cu-based zeolite catalysts, which is beneficial for catalyst redesign and activity improvement. Based on our research, a comprehensive mechanism contributing to the performance of Ag/Al 2 O 3 in HC-SCR is provided, giving a clue to the design of a catalytic system with high efficiency.

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“…For a given parent zeolite, the activity of Fe-ZSM-5 for NH 3 -SCR depended strongly on the preparation method. Among various methods for Fe-ZSM-5 preparation, liquid ion exchange (IE) [6][7][8], incipient wetness impregnation (IWI) [7][8][9][10], chemical vapor deposition (CVD) [11][12][13][14][15], and solid state ion exchange (SSIE) [16][17][18] are well known.The performance of Fe-ZSM-5 in the NH 3 -SCR reaction is related to the Fe species distributions on the catalyst. According to the results of UV-Vis diffuse reflectance spectroscopy (DRS), Mössbauer, and electron paramagnetic resonance (EPR) spectroscopy, the Fe species coexisting on Fe-ZSM-5 in some studies of the application of Fe-ZSM-5 in NH 3 -SCR are SHI Xiaoyan et al / Chinese Journal of Catalysis, 2012, 33: 454-464 One of the challenges for the practical application of Fe-ZSM-5 catalysts is their limited hydrothermal stability at high temperatures [4,5].…”

mentioning

confidence: 99%

Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

Shi¹,

LIU²,

Shan³

et al. 2012

Chinese Journal of Catalysis

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Characterization of Fe/ZSM-5 DeNO catalysts prepared by different methods: Relationships between active Fe sites and NH3-SCR performance

Cited by 256 publications

References 51 publications

A Comprehensive Study of Deep Catalytic Oxidation of Benzene, Toluene, Ethyl Acetate, and their Mixtures over Pd/ZSM-5 Catalyst: Mutual Effects and Kinetics

A Comprehensive Study of Deep Catalytic Oxidation of Benzene, Toluene, Ethyl Acetate, and their Mixtures over Pd/ZSM-5 Catalyst: Mutual Effects and Kinetics

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

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Characterization of Fe/ZSM-5 DeNO catalysts prepared by different methods: Relationships between active Fe sites and NH3-SCR performance

Cited by 256 publications

References 51 publications

A Comprehensive Study of Deep Catalytic Oxidation of Benzene, Toluene, Ethyl Acetate, and their Mixtures over Pd/ZSM-5 Catalyst: Mutual Effects and Kinetics

A Comprehensive Study of Deep Catalytic Oxidation of Benzene, Toluene, Ethyl Acetate, and their Mixtures over Pd/ZSM-5 Catalyst: Mutual Effects and Kinetics

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

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Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects