Investigation of HNCO adsorption and hydrolysis on Fe-ZSM5

Piazzesi, Gaia; Nicosia, Daniele; Devadas, Mukundan; Kröcher, Oliver; Elsener, Martin; Wokaun, Alexander

doi:10.1007/s10562-007-9072-2

Cited by 35 publications

(20 citation statements)

References 33 publications

(50 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But it may also be the C=C stretch band of propene or other intermediates bands that are close to 1650 cm -1 . The bands at 2218, 2254 and 2278 cm -1 can be assigned to Cu + -NCO [34], R-NCO over zeolites [35] and R-CN [36], respectively. The appearance of all these bands confirms the formation of organic intermediates from the reaction between surface NOx species and propene.…”

Section: Steady-state Effects Of Co H 2 and C 3 H 6 On Nh 3 -Scr Reamentioning

confidence: 99%

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

2016

View full text Add to dashboard Cite

We investigated the steady-state and transient effects of reductants (CO, H 2 and C 3 H 6 ) on NO 2 reduction, NH 3 -SCR (selective catalytic reduction), NH 3 adsorption and oxidation, and N 2 O production on a Cu-SSZ-13 monolithic catalyst. The three reductants affect to different extents the standard SCR (NO + NH 3 + O 2 ), fast SCR (NO + NH 3 + NO 2 ), and slow SCR (NH 3 + NO 2 ). This study underscores the importance of accounting for the impact of reducing agents on conventional NH 3 -SCR reaction mechanism when SCR catalyst is subjected to either rich regeneration of integrated systems (LNT + SCR, SCR on DPF) or cold-start. Propylene is most effective in promoting NO 2 reduction to NO by formation of organic intermediates. CO effectively reduces nitrates to nitrites that then react with NO 2 , releasing NO. H 2 can follow a similar pathway as CO but is less effective. In addition, H 2 can also enable a H 2 -based SCR pathway through the reduction of Cu cations to Cu 0 which then catalyze the NOx reduction. This pathway is particularly evident at high temperatures and low O 2 levels. As for NH 3 -SCR reactions, propylene competes with NH 3 for adsorbed NO 2 , which generates NO and thus increases the NO/NOx ratio. This leads to the dominance of either fast or standard SCR for a slow SCR (NH 3 + NO 2 ) feed condition when C 3 H 6 is present. CO has only a minor effect on both standard and fast SCR but a promoting effect on slow SCR. The ineffective reduction of NO 2 to NO by H 2 at low temperature (T < 250 o C) results in a negligible effect on slow SCR. In contrast to steady-state operation, lean/rich cycling enhances cycle-averaged NOx conversion for each of the NH 3 -SCR reactions when adding either C 3 H 6 or a CO + H 2 mixture in the rich phase. A decreased N 2 O generation rate from the slow SCR reaction is observed when any of the three reductants are present due in part to their reaction with ammonium nitrates.

show abstract

Section: Steady-state Effects Of Co H 2 and C 3 H 6 On Nh 3 -Scr Reamentioning

confidence: 99%

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

2016

View full text Add to dashboard Cite

show abstract

“…39 We would also like to mention that the broad lines at g ¼ 2.3 and g ¼ 4.3 for Fe 2 O 3 and/or Fe nanoparticles do not appear in our case. 40 In order to further examine the factors influencing magnetism, SVTF and SFTF ceramics were post-treated in oxygen atmosphere [600 C, 24 h, Figs. 4(b) and 4(c)].…”

Section: Considering T C Near 650 K [Figs 3(a) and 3(b)] And Increasmentioning

confidence: 99%

Induction and control of room-temperature ferromagnetism in dilute Fe-doped SrTiO3 ceramics

Lü

Zhu

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

The magnetic characteristics of dilute Fe-doped SrTiO3 ceramics are studied. The room-temperature ferromagnetism (with transition temperature around 650 K) is successfully realized in Sr0.98Ti0.9Fe0.1O3−δ and Sr0.98Ti0.92Fe0.1O3−δ ceramics. It is found that a fine-tuning of the components could alter the substitution sites of Fe ions and in-turn modulates the magnetism of the material. A systematic analysis reveals that the co-substitution of Fe ions at nonequivalent A and B sites in ABO3 type perovskites is in favor of the ferromagnetism, which could be attributed to the mixed-valence-states of Fe ions and the variation of exchange interactions. This work provides an innovation for the induction and control of ferromagnetism in dilute magnetic materials.

show abstract

“…For the synthesis, see: Broomhead et al (1960). For hydrolysis of cyanate to give carbonate at elevated temperatures, see : Seifer & Tarasova (1982); Seifer et al (1981); Piazzesi et al (2007). For thermodynamics of the outer sphere solution interaction of [Co(en) 3 ] 3+ with the carbonate ion, see: Mironov et al (1973Mironov et al ( , 1976.…”

Section: Related Literaturementioning

confidence: 99%

Tris(ethane-1,2-diamine-κ²N,N′)cobalt(III) carbonate iodide tetrahydrate

2010

View full text Add to dashboard Cite

Key indicators: single-crystal X-ray study; T = 123 K; mean (C-C) = 0.002 Å; R factor = 0.023; wR factor = 0.048; data-to-parameter ratio = 33.2.The title compound, [Co(C 2 and I À anions and four water molecules in the asymmetric unit. In the cation, the three rings formed by the ethylenediamine units and the Co III metal ion are in slightly distorted twist conformations. Numerous O-HÁ Á ÁO, N-HÁ Á ÁO, N-HÁ Á ÁI and O-HÁ Á ÁI intermolecular hydrogen bonds between the cation and two anions in concert with the four water molecules dominate the crystal packing and create a supramolecular infinite three-dimensional framework.

show abstract

Investigation of HNCO adsorption and hydrolysis on Fe-ZSM5

Cited by 35 publications

References 33 publications

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

Induction and control of room-temperature ferromagnetism in dilute Fe-doped SrTiO3 ceramics

Tris(ethane-1,2-diamine-κ²N,N′)cobalt(III) carbonate iodide tetrahydrate

Contact Info

Product

Resources

About

Investigation of HNCO adsorption and hydrolysis on Fe-ZSM5

Cited by 35 publications

References 33 publications

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

Induction and control of room-temperature ferromagnetism in dilute Fe-doped SrTiO3 ceramics

Tris(ethane-1,2-diamine-κ2N,N′)cobalt(III) carbonate iodide tetrahydrate

Contact Info

Product

Resources

About

Tris(ethane-1,2-diamine-κ²N,N′)cobalt(III) carbonate iodide tetrahydrate