Excessively Copper Ion-exchanged ZSM-5 Zeolites as Highly Active Catalysts for Direct Decomposition of Nitrogen Monoxide

Iwamoto, Masakazu; Yahiro, Hidenori; Mine, Yoshihiro; Kagawa, Shuichi

doi:10.1246/cl.1989.213

Cited by 220 publications

(117 citation statements)

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“…K-ZSM-5 (Si/Al = 31, ExxonMobil Chemical) was put in the Na + form and overexchanged with Cu 2+ according to the method of Iwamoto et al [56]. One gram of Na-ZSM-5 was ion-exchanged in 25 ml of a 0.01 M Cu(CH 3 CO 2 ) 2 · H 2 O solution at ambient temperature for 24 h. This procedure was repeated three times.…”

Section: Samplesmentioning

confidence: 99%

An operando optical fiber UV–vis spectroscopic study of the catalytic decomposition of NO and N2O over Cu-ZSM-5

Groothaert

Lievens

Leeman

et al. 2003

Journal of Catalysis

138

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The role of the bis(µ-oxo)dicopper core, i.e., [Cu 2 (µ-O) 2 ] 2+ , in the decomposition of NO and N 2 O by the Cu-ZSM-5 zeolite has been studied with combined operando UV-vis monitoring of the catalyst and on-line GC analysis. An optical fiber was mounted on the outer surface of the quartz wall of the plug-flow reactor and collected the UV-vis diffuse reflectance spectra under true catalytic conditions.

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Section: Samplesmentioning

confidence: 99%

An operando optical fiber UV–vis spectroscopic study of the catalytic decomposition of NO and N2O over Cu-ZSM-5

Groothaert

Lievens

Leeman

et al. 2003

Journal of Catalysis

138

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“…Selective catalytic reduction (SCR) of NOx by NH3 is an efficient technology for controlling NOx emissions [1]. Ever since Iwamoto et al [2] reported that the Cu-ZSM-5 catalyst showed high activity of selective catalytic reduction of NOx, much work has been performed to explore the catalytic properties of those catalysts, especially for on-road applications [3,4]. The utility of ZSM-5 as catalyst supports derives significantly from their remarkable ion-exchange capacity [5].…”

Section: Introductionmentioning

confidence: 99%

Cerium doped copper/ZSM-5 catalysts used for the selective catalytic reduction of nitrogen oxide with ammonia

Dou

Wang

et al. 2015

Chemical Engineering Journal

131

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Abstract:The CuCe/ZSM-5 catalysts with different cerium loadings (0, 0.5, 1.0, 1.5 and 2.0 wt.%) was investigated to evaluate the correlation between structural characteristics and catalytic performance for the selective catalytic reduction (SCR) of NO by NH3. It was found that the addition of cerium increased copper dispersion and prevented its crystallization. According to the results of X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction by hydrogen (H2-TPR), copper species were enriched on the ZSM-5 grain surfaces and part of copper ions was incorporated into the cerium lattice. Addition of cerium improved the redox properties of the CuCe/ZSM-5 catalysts, owing to the higher valence of copper and mobility of lattice oxygen than those of Cu/ZSM-5 catalyst. Hence the introduction of * Corresponding author. Tel.: +86-22-60601278; Fax.: +86-22-60600320 E-mail address: haoqinglan@tust.edu.cn ** Corresponding author. Tel.: +822 2220 0441; fax: +822 2220 2299 (K. Hui)E -mail address: kshui@hanyang.ac.kr (K. Hui) 2 cerium in Cu/ZSM-5 improved significantly NO conversion. On the one hand, the cerium introduction into Cu-Z enhances their low-temperature activities. 95% NO conversion is reached around 197 ºC for Cu-Z while the corresponding temperature value decreases to 148 ºC for CuCe4-Z. On the other hand, the temperature range of efficient NO reduction (95%) also extends to higher temperature when the cerium are added to Cu/ZSM-5. Among the Cu-Ce/ZSM-5 catalysts tested, the CuCe4-Z sample exhibits the highest catalytic activity with the temperature range for 90% NO removal of 148-427 ºC.

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“…For the decomposition of NO, it has been indicated that Cu-ZSM-5 is the most active catalyst [8][9][10]. Unfortunately, over-exchanged capacity of Cu-ZSM-5 is active only in a limited interval of temperatures and in the absence of O 2 [11].…”

Section: Introductionmentioning

confidence: 99%

Direct decomposition of NO by microwave heating over Fe/NaZSM-5

Tang

Zhang

Liang

et al. 2002

Applied Catalysis B: Environmental

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Excessively Copper Ion-exchanged ZSM-5 Zeolites as Highly Active Catalysts for Direct Decomposition of Nitrogen Monoxide

Cited by 220 publications

References 1 publication

An operando optical fiber UV–vis spectroscopic study of the catalytic decomposition of NO and N2O over Cu-ZSM-5

An operando optical fiber UV–vis spectroscopic study of the catalytic decomposition of NO and N2O over Cu-ZSM-5

Cerium doped copper/ZSM-5 catalysts used for the selective catalytic reduction of nitrogen oxide with ammonia

Direct decomposition of NO by microwave heating over Fe/NaZSM-5

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