Regulation of the copper-oxide cluster structure and DeNOx activity of Cu-ZSM-5 catalysts by variation of OH/Cu2+

Yashnik, S. A.; Salnikov, Anton; Vasenin, N. T.; Anufrienko, V. F.; Ismagilov, Z. R.

doi:10.1016/j.cattod.2012.08.033

Cited by 39 publications

(32 citation statements)

References 46 publications

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“…Similar H 2 -TPR data were reported in the literature for the ion-exchanged Cu-ZSM-5 catalysts containing isolated copper ions [9,[36][37][38].…”

Section: Redox Properties Of Cu-zsm-5 Catalystssupporting

confidence: 86%

“…3 shows ESR spectra of n% Cu(˛)ZSM-5 samples synthesized by the ion exchange with aqueous and water-ammonia solution of copper acetate with different NH 4 + /Cu 2+ ratio. The ESR spectra of the air-dried n% Cu(˛)ZSM-5 samples with low and high Cu loading at 77 K contain the signal which parameters correspond to isolated hexaaquacopper(II) [4,14,16] and tetraamminecopper [9,30] complexes (Fig. 3A, curves 1 and 3-5, respectively).…”

Section: State Of Copper Ions In Calcined Cu-zsm-5 Catalystsmentioning

confidence: 99%

“…9. Rate constant of NO (A and B) and propane (C and D) conversion over n% Cu(˛)ZSM-5 catalysts at 275 • C. The n% Cu(˛)ZSM-5 samples have been prepared by the ion-exchange of H-ZSM-5 (curves 1, 4-9), NH4-ZSM-5 (curve 2) or Na-ZSM-5 (curve 3) with water-ammonia solution of copper acetate at NH4 + /Cu 2+ ratio (˛) equal to 0 (curves 1, 2, 3), 3 (curve 5), 6 (curve 6,8,9), 15 (curve 7) and 30 (curve 4), including those containing additive of 1 M (curve 8) and 3 M (curve 9) of ammonium acetate. a˛(* 10 -2 s -1 g Cu -1 ) is slope of correlation between kNO or kC3H8 and copper content for each NH4 + /Cu 2+ ratio.…”

Section: Catalytic Properties Of Cu-zsm-5 Catalysts In Scr Of No By Pmentioning

confidence: 99%

“…In the latter case, the copper exchange level can reach value as high as 200-400% [1,4,13]. For the over-exchanged Cu-ZSM-5, the predominant copper state corresponds to copper dimers ([Cu-O-Cu] 2+ , [10,17]), bis(-oxo) dicopper [Cu-(O) 2 -Cu] 2+ [3] and chain-like copperoxide structures [4] inside the zeolite channels and highly dispersed copper-oxide clusters on the zeolite surface [9,18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Up to date, various research groups have been involved in investigation of the active state of copper ions [3,4], a search for new catalytic reactions with participation of Cu-ZSM-5 [5,6], and development of advanced methods for the synthesis of copper-containing catalysts [7][8][9]. Although post-synthetic modification of zeolites was considered in many works, ion exchange remains the most widely used method of copper acetate [4,10,20], nitrate [4,10,13], chloride [4,9,10] or sulfate [4,10,21]. The duration of the ion exchange commonly ranges from 12 to 48 hours.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Cu-substituted ZSM-5 catalyst: Controlling of DeNO reactivity via ion-exchange mode with copper–ammonia solution

Yashnik

Ismagilov

2015

Applied Catalysis B: Environmental

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“…Similar H 2 -TPR data were reported in the literature for the ion-exchanged Cu-ZSM-5 catalysts containing isolated copper ions [9,[36][37][38].…”

Section: Redox Properties Of Cu-zsm-5 Catalystssupporting

confidence: 86%

Section: State Of Copper Ions In Calcined Cu-zsm-5 Catalystsmentioning

confidence: 99%

Section: Catalytic Properties Of Cu-zsm-5 Catalysts In Scr Of No By Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cu-substituted ZSM-5 catalyst: Controlling of DeNO reactivity via ion-exchange mode with copper–ammonia solution

Yashnik

Ismagilov

2015

Applied Catalysis B: Environmental

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The Oscillatory Behaviour of Cu‐ZSM‐5 Catalysts for N₂O Decomposition: Investigation of Cu Species by Complementary Techniques

Rizzetto,

Sartoretti,

Khoma

et al. 2024

ChemPhysChem

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Copper‐exchanged ZSM‐5 (Cu‐ZSM‐5) is a promising catalyst thanks to the Cu redox pair. A particular feature of this material consists in the presence of spontaneous isothermal oscillations which take place during N2O decomposition reaction, depending on the operating conditions. In the present work, a set of five Cu‐ZSM‐5 catalysts are synthesised by three procedures and three different copper precursor concentrations: i) wet impregnation, ii) single ion exchange, and iii) double ion exchange. Catalytic tests reveal that the ion‐exchanged samples exhibit a low catalytic activity and no oscillatory behaviour, except for the twice‐exchanged sample which achieves an average N2O conversion of 26% at 400 °C. Conversely, the impregnated samples reach higher levels of N2O conversion (66% for Cu5ZSM5_WI and 72% for Cu10ZSM5_WI) and demonstrate a similar oscillating pattern. Further investigations disclosed that the most active catalysts, characterised by the presence of oscillatory behaviour, have more abundant and easily reducible copper specis (ICP, EDX and H2‐TPR) which interacts better with the zeolitic support (FT‐IR). Catalytic tests under a long time on stream (TOS) suggest that either self‐organised patterns or deterministic chaos can be achieved during the reaction, depending on the operating conditions, such as temperature and contact time.

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Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Zhang

Yan

2022

J of Chemical Tech & Biotech

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BACKGROUND: Cu-ZSM-5 was prepared on paper-like sintered stainless steel fibers (PSSF) by ion-exchange method for the catalytic wet peroxide oxidation (CWPO) of phenol in a fixed bed reactor. The prepared Cu-ZSM-5/PSSF catalyst was characterized by scanning electron microscope (SEM), Brunner−Emmet−Teller (BET), X-ray diffraction (XRD), Fourier Transform InfraRed (FT-IR), Ultraviolet-visiblespectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). RESULTS:The XRD results showed that the ZSM-5 membrane was loaded well over PSSF with good crystallinity, even after the process of ion-exchange. The UV-vis inferred that isolated copper was the predominant species over ZSM-5 pores of the catalyst. Then, the effects of different catalyst bed heights, reaction temperatures, and feed flow rates on catalytic performance were investigated to obtain optimum reaction conditions. CONCLUSIONS: Finally, the catalytic reaction kinetics analysis over Cu-ZSM-5/PSSF catalyst were carried out with the Powerrate Law Kinetic model. The experimental results showed that the reaction order was the first-order reaction, and the activation energy of the oxidation reaction was Ea = 72.9 kJ/mol. The initial oxidation rate equation (−r A0 = 5.36 × 10 8 e −72 994/RT C A ) was obtained for phenol degradation using Cu-ZSM-5/PSSF catalyst.

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Regulation of the copper-oxide cluster structure and DeNOx activity of Cu-ZSM-5 catalysts by variation of OH/Cu2+

Cited by 39 publications

References 46 publications

Cu-substituted ZSM-5 catalyst: Controlling of DeNO reactivity via ion-exchange mode with copper–ammonia solution

Cu-substituted ZSM-5 catalyst: Controlling of DeNO reactivity via ion-exchange mode with copper–ammonia solution

The Oscillatory Behaviour of Cu‐ZSM‐5 Catalysts for N₂O Decomposition: Investigation of Cu Species by Complementary Techniques

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

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Regulation of the copper-oxide cluster structure and DeNOx activity of Cu-ZSM-5 catalysts by variation of OH/Cu2+

Cited by 39 publications

References 46 publications

Cu-substituted ZSM-5 catalyst: Controlling of DeNO reactivity via ion-exchange mode with copper–ammonia solution

Cu-substituted ZSM-5 catalyst: Controlling of DeNO reactivity via ion-exchange mode with copper–ammonia solution

The Oscillatory Behaviour of Cu‐ZSM‐5 Catalysts for N2O Decomposition: Investigation of Cu Species by Complementary Techniques

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

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The Oscillatory Behaviour of Cu‐ZSM‐5 Catalysts for N₂O Decomposition: Investigation of Cu Species by Complementary Techniques