A more efficient copper-ion-exchanged ZSM-5 zeolite for N2 adsorption at room temperature: Ion-exchange in an aqueous solution of Cu(CH3COO)2

Kuroda, Yasushige; Kumashiro, Ryotaro; Itadani, Atsushi; Nagao, Mahiko; Kobayashi, Hisayoshi

doi:10.1039/b009942m

Cited by 42 publications

(81 citation statements)

References 36 publications

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“…Therefore, there is no doubt that after reduction in CO, the predominant part of copper was transformed into Cu þ ions. This conclusion also well agrees with the previously reported literature data on self-reduction of bivalent copper after vacuum treatment at high temperature or reduction in CO [9][10][11][12][13].…”

Section: Resultssupporting

confidence: 94%

“…In Ref. [13] these findings were confirmed by quantum chemical calculations. In the present study we for the first time report unusually strong adsorption by Cu þ ions of molecular hydrogen both at 77 K and at room temperature.…”

Section: Introductionsupporting

confidence: 62%

“…It was also reported in Refs. [9][10][11][12][13] that reduced Cu þ ions very strongly adsorb CO and nitrogen. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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Unusual Forms of Molecular Hydrogen Adsorption by Cu+1 Ions in the Copper-Modified ZSM-5 Zeolite

Kazansky

Serykh

2004

Catalysis Letters

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DRIFT and IR transmittance spectra of H 2 adsorbed at 77 K or at room temperature by the copper-modified ZSM-5 zeolite pre-evacuated or pre-reduced in CO at 873 K indicated several unusual forms of adsorbed hydrogen. H-H stretching frequencies of adsorbed species at 3075-3300 cm À1 are by about 1000 cm À1 lower than in the free hydrogen molecules. This indicates unusually strong perturbation of adsorbed hydrogen by reduced Cu þ1 ions that has been never before reported neither for hydrogen nor for adsorption of other molecules by any cationic form of zeolites or oxides.KEY WORDS: Cu loaded ZSM-5 zeolite; molecular hydrogen adsorption; IR spectra of adsorbed hydrogen.

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Section: Resultssupporting

confidence: 94%

Section: Introductionsupporting

confidence: 62%

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Unusual Forms of Molecular Hydrogen Adsorption by Cu+1 Ions in the Copper-Modified ZSM-5 Zeolite

Kazansky

Serykh

2004

Catalysis Letters

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“…In studies on Cu + ions in glass (Arletti et al. 2006) or zeolites (Kuroda et al. 2001) this feature has been attributed to the presence of three coordinated Cu.…”

Section: Resultsmentioning

confidence: 99%

THE SECTILIA PANELS OF FARAGOLA (ASCOLI SATRIANO, SOUTHERN ITALY): A MULTI‐ANALYTICAL STUDY OF THE GREEN, MARBLED (GREEN AND YELLOW), BLUE AND BLACKISH GLASS SLABS

Gliozzo

Barbone

d’Acapito³

et al. 2010

Archaeometry

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Analyses at the Cu–K, Fe–K and Mn–K edge were performed to study the green, marbled (green and yellow), blue and blackish (deep greyish olive green) glass slabs decorating three sectilia panels from the archaeological site of Faragola. Results indicate that all slabs were made by mixing siliceous sand with natron, sometimes probably mixed with small percentages of plant ash. Cu2+ and Pb antimonates should be responsible for the opaque green colours. The dark green and yellow portions of the marbled slabs are respectively comparable to the slabs comprising only one of these colours. Cu2+ together with Ca antimonates probably produced light blue slabs, whereas cobalt was used to produce dark blue slabs. We consider it possible that the abundance ratio of Fe2+/Fe3+ and the complex Fe3+S2− would have an effect on the blackish slabs. The contribution of Mn cannot be ascertained even if it could have played a role in darkening glass colour. The comparison between the chemical composition of Faragola samples and several glass reference groups provided no conclusive evidence of provenance; whereas, the presence of a secondary local workshop can be hypothesized.

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“…It is generally accepted that the higher the blue shift, the stronger is the interaction, according to the Lewis acidic strength of the metal site. 29,[262][263][264][265][266]337,[388][389][390][391][392] Cu-exchanged zeolites are usually prepared via liquid-phase exchange from cupric salts, resulting in the introduction of divalent cations into the framework. The increase in electron density in the antibonding orbitals of the CO molecule causes the force constant of the C-O bond to decrease, the C-O bond length to increase and therefore Dñ(CO) to be red-shifted with respect to that of the gas.…”

Section: Charge-balancing Extraframework Cationsmentioning

confidence: 99%

Probing zeolites by vibrational spectroscopies

et al. 2015

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This review addresses the most relevant aspects of vibrational spectroscopies (IR, Raman and INS) applied to zeolites and zeotype materials. Surface Brønsted and Lewis acidity and surface basicity are treated in detail. The role of probe molecules and the relevance of tuning both the proton affinity and the steric hindrance of the probe to fully understand and map the complex site population present inside microporous materials are critically discussed. A detailed description of the methods needed to precisely determine the IR absorption coefficients is given, making IR a quantitative technique. The thermodynamic parameters of the adsorption process that can be extracted from a variable-temperature IR study are described. Finally, cutting-edge space- and time-resolved experiments are reviewed. All aspects are discussed by reporting relevant examples. When available, the theoretical literature related to the reviewed experimental results is reported to support the interpretation of the vibrational spectra on an atomic level.

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A more efficient copper-ion-exchanged ZSM-5 zeolite for N2 adsorption at room temperature: Ion-exchange in an aqueous solution of Cu(CH3COO)2

Cited by 42 publications

References 36 publications

Unusual Forms of Molecular Hydrogen Adsorption by Cu+1 Ions in the Copper-Modified ZSM-5 Zeolite

Unusual Forms of Molecular Hydrogen Adsorption by Cu+1 Ions in the Copper-Modified ZSM-5 Zeolite

THE SECTILIA PANELS OF FARAGOLA (ASCOLI SATRIANO, SOUTHERN ITALY): A MULTI‐ANALYTICAL STUDY OF THE GREEN, MARBLED (GREEN AND YELLOW), BLUE AND BLACKISH GLASS SLABS

Probing zeolites by vibrational spectroscopies

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