SCR of NO by Propene on Monometallic (Co or Ni) and Bimetallic (Co/Ag or Ni/Ag) Mordenite-Based Catalysts

Dorado, Fernando; Lucas, Antonio de; García, Prado B.; Romero, Amaya; Valverde, J.L.; Asencio, Isaac

doi:10.1021/ie050398d

Cited by 19 publications

(23 citation statements)

References 61 publications

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“…This is attributed to the formation of a secondary lattice generated by occupation of the zeolite cages by Ag(I) ions. Previous Al MAS NMR studies [27] have suggested that the distribution of framework Al atoms in zeolites is organized and not random [30]. A phenomenon very similar to that seen in the XRD spectra of the Y zeolitebased catalysts can be seen for the XRD spectra of the synthesized sodalite and the Fe-SOD, Ag-SOD, and Ag/Fe-SOD catalysts.…”

Section: Resultssupporting

confidence: 66%

“…Previous research has found that introduction of a second metal ion to the Ag(I) clusters results in enhancement of catalytic activity [21][22][23][24][25][26][27]. Research specific to decontamination purposes has found that decomposition of the nerve agent simulant dimethyl methylphosphonothioate (DMMP), which has a functional group similar to carbaryl, is enhanced by the participation of an Fe(III)/Fe(II) mixedvalence couple [28].…”

Section: Introductionmentioning

confidence: 99%

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Zeolite-supported silver and silver–iron nanoclusters and their activities as photodecomposition catalysts

Gomez

Yson

et al. 2011

Res Chem Intermed

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Catalysts containing nanoclusters of Ag(I) and Fe 2 O 3 as dopants with sodalite and Y zeolite supports have been investigated in order to develop a more efficient catalyst for photodecomposition of the pesticide carbaryl and to gain insight about the reaction mechanism. Ag(I)-sodalite, Ag(I)/Fe 2 O 3 -sodalite, Ag(I)-Y zeolite, and Ag(I)/Fe 2 O 3 -Y zeolite were synthesized by ion-exchange techniques and characterized by powder X-ray diffraction (XRD), solid-state luminescence, UV-visible absorption, and atomic absorption spectroscopy measurements. The luminescence activity of the sodalite-supported and Y zeolite-supported catalysts was significantly different. Catalyst performance studies were conducted using carbaryl as the target compound and specific wavelengths of UV light as photon sources for the experiments. The studies showed that each catalyst's performance was determined primarily by the specific wavelength of the UV light with which the system was irradiated. The studies also showed that inclusion of Fe 2 O 3 as dopant enhanced the reactivity of the catalysts in several instances, with the Ag(I)/Fe 2 O 3 -sodalite catalyst and 298 nm irradiation being the most reactive of the systems studied. Additional reactions using each catalyst and 298 nm irradiation, and including either sodium bicarbonate as hydroxyl radical scavenger or D 2 O as solvent, showed that hydroxyl radicals were likely intermediates in the catalyzed photodecomposition reaction.

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Section: Resultssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Zeolite-supported silver and silver–iron nanoclusters and their activities as photodecomposition catalysts

Gomez

Yson

et al. 2011

Res Chem Intermed

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“…9 shows new bands in the 2300-2050 cm −1 region, which correspond to intermediate species produced by the reaction between the adsorbed toluene and NO at 400 • C. The band at 2266 cm −1 is usually assigned to the stretching vibration of isocyanate groups (N=C=O) on Ag + ions while the signals at 2130 and 2100 cm −1 are assigned to cyanide (Ag-CN) and isocyanide (Ag-NC) species adsorbed on the catalyst surface, respectively (Dorado et al 2005;Yeom et al 2007;Shimizu et al 2001;Tamm et al 2008;Thibault-Starzyk et al 2009). …”

Section: Toluene Adsorption Followed By Sweep With 1000 Ppm No/he Flowmentioning

confidence: 99%

FTIR studies of butane, toluene and nitric oxide adsorption on Ag exchanged NaMordenite

2011

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In this work, we studied the adsorption of butane, toluene and nitric oxide on NaMordenite exchanged with different amounts of silver. The reactions that occurred when the adsorbed hydrocarbons interacted with NO and the effect of water adsorption were also addressed. Different silver species were formed after ion exchange and they were detected by TPR analysis. Highly dispersed Ag 2 O particles were reduced at temperatures lower than 300°C whereas Ag + exchanged ions showed two TPR peaks, which can be ascribed to species exchanged at different mordenite sites. The TPD experiments after adsorption of NO at 25°C showed that the only desorbed species was NO 2 which was formed by the total reduction of Ag 2 O particles. When the adsorbed butane was exposed to NO (1000 ppm), isocyanate species were formed on Ag + ionic sites as well as Ag + -(NOx)-CO species. Toluene adsorption was stronger than butane since adsorbed toluene molecules were held even at 400°C. The characteristic bands of the aromatic ring C=C bond was observed as well as that of methyl groups interacting with Ag + and Na + ions. However, the appearance of carboxylic groups at temperatures above 300°C in inert flow indicated the partial oxidation of toluene due to Ag 2 O species present in the samples. After contacting adsorbed toluene with NO, different FTIR bands correspond to organic nitrocompounds, isocyanate, cyanide and isocyanide species adsorbed on Ag + ions, were detected. The presence of water inhibited the formation of NO 2 species and the hydrocarbon adsorption on Na + sites but did not affect the toluene-Ag + interaction.

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“…However, it seems that only limited types of zeolites including ZSM-5 (Li et al, 2004;Li et al, 2008;Wang et al, 2007a;Wang et al, 2007b;Wang et al, 2005;Niu et al, 2006), ferrierite (Seijger et al, 2003;Lee et al, 2003;Kubacka et al, 2005;Kubacka et al, 2006) and mordenite (Pieterse & Booneveld, 2007;Mosqueda-Jiménez et al, 2003a;Córdoba et al, 2005;Lónyi et al, 2007;Dorado et al, 2005), which are called as pentasil zeolites, displayed high selectivity to NO x reduction in HC-SCR. For instance, Pieterse et al (Pieterse et al, 2003) investigated the selective catalytic reduction of NO by methane (CH 4 -SCR) over several zeolite-based catalysts and reported an activity order of Co-Pd-ZSM-5 > Co-Pd-MOR > Co-Pd-FER > Co-Pd-BEA.…”

Section: To Characterize Surface Acidity Of the Catalystmentioning

confidence: 99%

Fourier Transforms Infrared Spectroscopy Applied in Selective Catalytic Reduction of NO by Acetylene

Wang¹

2011

Fourier Transforms - New Analytical Approaches and FTIR Strategies

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SCR of NO by Propene on Monometallic (Co or Ni) and Bimetallic (Co/Ag or Ni/Ag) Mordenite-Based Catalysts

Cited by 19 publications

References 61 publications

Zeolite-supported silver and silver–iron nanoclusters and their activities as photodecomposition catalysts

Zeolite-supported silver and silver–iron nanoclusters and their activities as photodecomposition catalysts

FTIR studies of butane, toluene and nitric oxide adsorption on Ag exchanged NaMordenite

Fourier Transforms Infrared Spectroscopy Applied in Selective Catalytic Reduction of NO by Acetylene

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