Selective catalytic reduction of NOx with NH3 over Cu-ZSM-5—The effect of changing the gas composition

Sjövall, Hanna Maria; Olsson, Louise; Fridell, Erik; Blint, Richard J.

doi:10.1016/j.apcatb.2005.12.003

Cited by 232 publications

(159 citation statements)

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“…However, at high copper or iron concentrations aggregates of CuO and Fe oxide may be formed which are much less active than Cu 2+ and Fe 2+ . They may block the pores of ZSM-5, resulting in decreased activity [19,22]. The amount of copper and iron loaded into the catalyst was lower in the catalyst with hydrothermal treatment, HT-CuFeZSM-5, than that in the catalyst with ion exchange, IE-CuFeZSM-5.…”

Section: Catalytic Activities Of Different Catalystsmentioning

confidence: 94%

“…For calcination, catalyst was first heated to 423 K at a heating rate of 353 K/min and kept there for 15 min and then it was heated to 873 K at a rate of 323 K/min and kept at that temperature for 2 h. The color of the sample did not change after calcination at 873 K. This catalyst was named as IEFeZSM-5. The other part of uncalcined FeZSM-5 catalyst was first dried at 353 K for 1 h and then 398 K for 30 min and then subjected to ion exchange of copper [19]. For this purpose 2.72 g dried sample was mixed with 72.5 cm 3 of 11 mM Cu(CH 3 COO) 2 (Cu(Ac) 2 ) (Merck) in an erlenmeyer.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Isolated Cu 2+ sites grafted to Al-MCM-41 also gave relatively high catalytic activity in ethane oxidation [18]. On the other hand, copper exchanged zeolites such as CuZSM-5 have been widely studied for selective catalytic reduction of NO x to N 2 with ammonia [19][20][21].…”

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confidence: 99%

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Characterization and catalytic activity of CuFeZSM-5 catalysts for oxidative degradation of Rhodamine 6G in aqueous solutions

Dükkancı

Gündüz

Yılmaz

et al. 2010

Applied Catalysis B: Environmental

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This study presents an evaluation of the catalytic performances of Fe and Cu containing ZSM-5 zeolites for oxidation of Rhodamine 6G. Fe and Cu were loaded by ion exchange or through hydrothermal synthesis. The catalytic process was carried out in an aqueous solution using H2O2 as an oxidant. The catalyst prepared by hydrothermal synthesis showed the highest activity (100% decolorization, 59.1% aromatic degradation and 51.8% TOC removal at initial pH of 3.5). This catalyst was stable against leaching even at low pH. The change in activity of the catalysts prepared was attributed to incorporation of the Fe and Cu species with ZSM-5. Fe and Cu were in structural locations - in the framework - in the catalyst prepared by hydrothermal synthesis while there were extraframework cations or species in catalysts prepared by ion exchange. Incoporation of Cu into FeZSM-5 increased its catalytic activity. © 2010 Elsevier B.V. All rights reserved.TÜBİTAK and NASU project number 107M62

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Section: Catalytic Activities Of Different Catalystsmentioning

confidence: 94%

Section: Catalyst Preparationmentioning

confidence: 99%

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Characterization and catalytic activity of CuFeZSM-5 catalysts for oxidative degradation of Rhodamine 6G in aqueous solutions

Dükkancı

Gündüz

Yılmaz

et al. 2010

Applied Catalysis B: Environmental

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“…On the other hand, it is well known that copper exchanged zeolites such as CuZSM-5 have been widely studied for selective catalytic reduction of NO x to N 2 with ammonia or propane [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

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Gündüz

Yılmaz

et al. 2010

Journal of Hazardous Materials

168

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a b s t r a c tIn this study, heterogeneous Fenton-like degradation of reactive azo dye Rhodamine 6G in water was investigated over a CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis. At initial pH of 3.4, a color removal of 100% was achieved after a reaction time of 45 min. TOC elimination was measured to be 51.8% after 2 h of oxidation. Initial decolorization rate was described by an equation of −r A0 = 4.56 × 10 2 e −24.83/RT C R6G,0 C 0.35 H 2 O 2 ,0 where R is in kJ/mol. The leaching of iron and copper cations from zeolite structure into the solution during oxidation was dependent on pH strongly. The regulation of pH from 6.5 (dye solution pH) to 3.4, increased leaching for iron from 0.7 to 0.8 mg/dm 3 and for copper from 1.4 to 2.1 mg/dm 3 . The copper was totally leached from the catalyst during the process at pH 3.4.

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“…Ammonia-SCR, Zeolite catalyst, Iron beta zeolite, Copper beta zeolite, Reaction order, Oxygen concentration not so severe 2),3),12),14), 15) . The apparent reaction orders of NO, O2, and NH3 were reported to be 1, 0.5, and zero, respectively 2), 12) .…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Concentration in NH<sub>3</sub>-SCR Reaction over Fe- and Cu-loaded Beta Zeolites

Takamitsu

Ito

Ogawa

et al. 2012

J. Jpn. Petrol. Inst.

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Selective catalytic reduction of NOx with NH3 over Cu-ZSM-5—The effect of changing the gas composition

Cited by 232 publications

References 30 publications

Characterization and catalytic activity of CuFeZSM-5 catalysts for oxidative degradation of Rhodamine 6G in aqueous solutions

Characterization and catalytic activity of CuFeZSM-5 catalysts for oxidative degradation of Rhodamine 6G in aqueous solutions

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

Effect of Oxygen Concentration in NH<sub>3</sub>-SCR Reaction over Fe- and Cu-loaded Beta Zeolites

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