Magnetic properties and oxidation state of iron in bimetallic Pt-Fe/KL zeolite catalysts

Schmauke, Thorsten; Menzel, M.; Roduner, Emil

doi:10.1016/s1381-1169(02)00522-8

Cited by 20 publications

(7 citation statements)

References 44 publications

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“…For comparison, FeZ-5-15WIE and FeZ-11-15SMI have large magnetic iron oxide particles, as shown by Mössbauer data, but the magnetic characterization displays their superparamagnetism, probably because the measurement time for SQUID (a few seconds) is longer than that of Mössbauer spectroscopy (10 À8 s) and the blocking temperature for SQUID is lower than that for Mössbauer spectroscopy. Thus, phases that behave as ferromagnets in Mössbauer spectroscopy may behave as superparamagnets in SQUID measurements [94]. Additionally, in Fig.…”

Section: Magnetization Studymentioning

confidence: 97%

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Xie

Luo

Ma³

et al. 2015

Journal of Catalysis

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Section: Magnetization Studymentioning

confidence: 97%

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Xie

Luo

Ma³

et al. 2015

Journal of Catalysis

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“…Consequently, high Mn oxidation state is needed to improve the NO x storage properties. For the iron modified catalyst, some Pt-Fe interaction can occur [20], and decrease the platinum activity.…”

Section: Characterization Of the Stabilized Catalystsmentioning

confidence: 99%

Influence of Mn and Fe Addition on the NO x Storage–Reduction Properties and SO2 Poisoning of a Pt/Ba/Al2O3 Model Catalyst

Corbos

Courtois

et al. 2009

Top Catal

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This work deals with the effect of Mn or Fe addition on the NO x storage-reduction properties of a Pt/Ba/Al 2 O 3 model catalyst. NO x storage capacity, SO 2 poisoning and regeneration and NO x removal efficiency under rich/lean cycling conditions are studied. Fe addition to Pt/Ba/Al 2 O 3 leads only to a small increase of NO x storage capacity, and more interestingly, to a better sulfur removal due to the inhibition of bulk barium sulfate formation. Unfortunately, the NO x storage property cannot be fully recovered. Moreover, Fe addition results in a decrease in the NO x removal efficiency. Mn addition also improves the NO x storage capacity, but no significant influence on the sulfur elimination is observed. Mn-doped catalyst does not improve the NO x removal efficiency, but NH 3 selectivity is found to drastically decrease at 400°C, from 20 to 3%. In addition, the NO x conversion can be improved at higher H 2 concentration in the rich pulse, always keeping NH 3 selectivity at low level.

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“…Furthermore, the complete reduction of metal ions stabilized by framework coordination within zeolites requires high temperature calcination and concomitant high energy consumption, increasing the cost of sorbent preparation. [34] A stable and protected, readily synthesized magnetic material with sufficient saturation magnetization is required if magnetic zeolites are to be used as industrial sorbents.…”

mentioning

confidence: 99%

Magnetic Multi‐Functional Nano Composites for Environmental Applications

Dong

Kuznicki

2009

Adv Funct Materials

115

103

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A novel concept is proposed to synthesize a new class of composites featuring magnetic, molecular sieve and metallic nanoparticle properties. These multi‐functional materials have potential applications as recyclable catalysts, disinfectants and sorbents. The magnetic property enables effective separation of the spent composites from complex multiphase systems for regeneration and recycle, safe disposal of the waste and/or recovery of loaded valuable species. The zeolite molecular sieve provides a matrix which supports a remarkably new, simple, efficient and economical method to make stable, supported silver nanoparticles by silver ion exchange and controlled thermal reduction. The silver nanoparticles generated in this way have excellent properties such as high reactivity and good thermal stability without aggregation, which act as nano reactors for desired functionality in a wide range of applications. Magnetic component (Fe3O4), molecular sieve matrix (zeolite) and silver nanoparticles generated by ion exchange followed by controlled reduction, together form this unique novel composite with designed functions. It represents a practically operational, economical, sustainable and environmentally friendly new advanced functional material. This paper focuses on the novel synthesis and characterization of the composite, with an example of applications as sorbents for the removal of vapor‐phase mercury from the flue gas of coal‐fired power plants.

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Magnetic properties and oxidation state of iron in bimetallic Pt-Fe/KL zeolite catalysts

Cited by 20 publications

References 44 publications

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Influence of Mn and Fe Addition on the NO x Storage–Reduction Properties and SO2 Poisoning of a Pt/Ba/Al2O3 Model Catalyst

Magnetic Multi‐Functional Nano Composites for Environmental Applications

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