Preparation and Characterization of the Cu+/ZSM-5 Catalyst and Its Reaction with NO under UV Irradiation at 275 K. In situ Photoluminescence, EPR, and FT-IR Investigations

Anpo, Masakazu; Matsuoka, Makoto; Shioya, Yasushi; Yamashita, Hideki; Giamello, Elio; Morterra, C.; Che, M.; Patterson, Howard H.; Webber, S. E.; Ouellette, S.; Fox, Marye Anne

doi:10.1021/j100073a029

Cited by 190 publications

(152 citation statements)

References 5 publications

Supporting

Mentioning

133

Contrasting

Unclassified

Order By: Relevance

“…Since the Cu + ions and Cu 2+ ions in CuO clusters or [Cu-O-Cu] 2+ are silent for EPR, these spectra can, with high probability, be assigned to isolated Cu 2+ ions [25][26][27] the EPR spectra for corresponding copper species are given in Table 2. The g and A parameters of these species are close to those ascribed in the literature to octahedral coordination [10,18,[28][29][30]. The largest intensity of the EPR spectra is observed for the high Cu-loaded catalyst prepared by the ion exchange method (1.92 wt.% Cu in Cu-MFI a ).…”

Section: Physico-chemical Properties Of Cu-mfisupporting

confidence: 85%

Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

Valkaj

Tomašić

Katović

et al. 2016

Materials Science-Poland

View full text Add to dashboard Cite

In this study the physico-chemical and catalytic properties of copper bearing MFI zeolites (Cu-MFI) with different Si/Al and Si/Cu ratios were investigated. Two different methods for incorporation of metal ions into the zeolite framework were used: the ion exchange from the solution of copper acetate and the direct hydrothermal synthesis. Direct synthesis of a zeolite in the presence of copper-phosphate complexes was expected to generate more active copper species necessary for the desired reaction than the conventional ion exchange method. Direct decomposition of NO was used as a model reaction, because this reaction still offers a very attractive approach to NO X removal. The catalytic properties of zeolite samples were studied using techniques, such as XRD, SEM, EPR and nitrogen adsorption/desorption measurements at 77 K. Results of the kinetic investigation revealed that both methods are applicable for the preparation of the catalysts with active sites capable of catalyzing the NO decomposition. It was found out that Cu-MFI zeolites obtained through direct synthesis are promising catalysts for NO decomposition, especially at lower reaction temperatures. The efficiency of the catalysts prepared by both methods is compared and discussed.

show abstract

Section: Physico-chemical Properties Of Cu-mfisupporting

confidence: 85%

Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

Valkaj

Tomašić

Katović

et al. 2016

Materials Science-Poland

View full text Add to dashboard Cite

show abstract

“…One such reaction that is effected photochemically with these SSHCs is the reduction of CO 2 with H 2 O (Anpo et al 1997). Another is the breakdown of NO (Anpo et al 1994). Yet, another example is the general decomposition of undesirable molecules with SSHCs (Anpo & Thomas 2006) as well as the selective oxidation of CO in the presence of H 2 (Kamegawa et al 2007).…”

Section: (B) Single-site Photocatalytic Systemsmentioning

confidence: 99%

The societal significance of catalysis and the growing practical importance of single-site heterogeneous catalysts

Thomas

2012

Proc. R. Soc. A.

View full text Add to dashboard Cite

The concept of single-site heterogeneous catalysis, herein defined and extensively illustrated, offers a strategy for the design of new solid catalysts. By capitalizing on the opportunities presented by nanoporous materials to assemble a wide range of new, well-defined, catalytically active centres, it is possible to bring about numerous environmentally benign processes that can replace traditional methods of chemical production. The latter often employs aggressive, corrosive or hazardous reagents. By using both microporous (less than 20 Å diameter) and mesoporous solids (20-500 Å diameter), abundant scope exists for the construction and application of shape-selective, regio-selective and enantioselective catalysts.Keywords: nanoporous solids; selectivity; benign reagents; renewable resources; clean technology; sustainability BackgroundIt would be difficult to overestimate or exaggerate the practical importance of heterogeneous catalysis. Think of the products of petroleum and natural gas upon which civilized life now relies. All the following are manufactured through the agency of solid catalysts: fuels (for transport and heating), fabrics, flavours, fragrances, fertilizers, certain foodstuffs and most pharmaceuticals. Moreover, many of the molecular building blocks for the production of a wide range of the commodities used in everyday life are also generated catalytically: propylene, benzene, toluene, xylene, benzaldehyde, terephthalic acid, adipic acid, caprolactam (precursor of nylon 6) and a variety of monomers for polymeric composites.In fundamental, academic terms, the phenomenon of catalysis is endlessly fascinating and perennially new. Its study presents a multiplicity of intellectual and technological challenges. If we are to understand how and why certain molecules transform readily and others do not when they impinge upon an active site, it is necessary, continually, to devise, develop and deploy new techniques of investigation. This is equally true if our aim-and it is one of prime importanceis to know more about the nature of the active site itself. Without a detailed understanding of the atomic architecture of the catalytically active centre, we are unlikely to be in a position to improve existing catalysts or design superior new ones (Thomas 1997).Because they readily facilitate the separation of products from unreacted reagents, and also because they are amenable to the various processes of thermal reactivation, heterogeneous catalysts (which almost invariably involve solid, active phases) are much more convenient to use than homogeneous ones. Consequently, they now figure eminently in the drive towards green chemistry, clean technology and sustainability. Those scientists concerned with such topics are currently exploring new ways of generating both energy and novel materials and in this regard, solid catalysts are of pivotal importance.There is now an exigent need to design and develop catalysts that can cope with and transform readily available reactants in an environmentally benign manner. N...

show abstract

“…[15,20] Anpo et al observed three bands in the photoluminescence spectrum at 420 nm, 470 nm, and 520 nm of Cu-ZSM-5. [21] The last band and an excitation band at 310 nm were assigned to Cu I dimer species, while the other two were attributed to isolated Cu I species. Here we note in passing that in the ZSM-5 samples investigated by all these groups the number of Cu ions per unit cell was two at most; this fact renders the occurrence of Cu I pairs rather unlikely.…”

Section: Introductionmentioning

confidence: 99%

On the Existence of CuI Pairs in ZSM-5—A Computational Study

et al. 2002

View full text Add to dashboard Cite

Preparation and Characterization of the Cu+/ZSM-5 Catalyst and Its Reaction with NO under UV Irradiation at 275 K. In situ Photoluminescence, EPR, and FT-IR Investigations

Cited by 190 publications

References 5 publications

Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

The societal significance of catalysis and the growing practical importance of single-site heterogeneous catalysts

On the Existence of CuI Pairs in ZSM-5—A Computational Study

Contact Info

Product

Resources

About