Structure of acid sites on sulfur-promoted iron oxide

Yamaguchi, Tsutomu; Jin, Tuo; Tanabe, Kozo

doi:10.1021/j100405a022

Cited by 349 publications

(171 citation statements)

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“…The activities increased with the calcination temperature, reaching a maximum at 500 o C, and then the activities decreased. These results are very similar to those reported by other authors, 44,45 where sulfated Fe 2 O 3 catalyst calcined at 500 o C exhibited a maximum catalytic activity. The decrease of catalytic activity after calcination above 500 o C can be probably attributed to the fact that the surface area and acidity above 500 o C decrease with the calcination temperature.…”

Section: 38supporting

confidence: 92%

Characterization of NiSO₄Supported on Fe₂O₃and Catalytic Properties for Ethylene Dimerization

2007

Bulletin of the Korean Chemical Society

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Section: 38supporting

confidence: 92%

Characterization of NiSO₄Supported on Fe₂O₃and Catalytic Properties for Ethylene Dimerization

2007

Bulletin of the Korean Chemical Society

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“…The amount of strongly adsorbed NH 3 on Ti 4þ -mont was over twice as much as those of the Al 3þ -and Fe 3þ -mont catalysts. M nþ -monts showed higher catalytic activities as well as surface acidities than sulfate ion-treated zirconium oxide (SO 4 2À -ZrO 2 ) 83,84 and H þ -exchanged zeolites such as H þ -mordenite, H þ -ZSM-5, and USY (Entries 1-4 vs Entries 9-12). These results imply that the above alkylation reaction may be catalyzed by the strong acid sites of the M nþ -mont catalysts.…”

Section: Acid-catalyzed Reactions By Timentioning

confidence: 99%

Design of High-Performance Heterogeneous Metal Catalysts for Green and Sustainable Chemistry

Kaneda¹,

Ebitani²,

Mizugaki³

et al. 2006

Bulletin of the Chemical Society of Japan

142

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This account reviews a novel approach to designing high-performance heterogeneous metal catalysts using hydroxyapatites, montmorillonites, and hydrotalcites as macroligands of active metal species for aerobic alcohol oxidations, carbon-carbon bond formations, and one-pot syntheses. The catalytic systems using the above heterogeneous catalysts offer significant benefits in achieving environmentally friendly organic syntheses aiming towards Green and Sustainable Chemistry. Furthermore, the present preparation method for the immobilization of metal species is strikingly simple and allows a strong protocol for creating various nanostructured and functionalized heterogeneous catalysts.Green and Sustainable Chemistry (GSC) is a revolutionary philosophy that aims to bring about a sustainable society by improvement of the safety and environmental aspects of chemical processes and reduction of the risks of chemical products to people and the environment.1 The emphasis is on eliminating waste at the source-primary pollution prevention-rather than finding incremental end-of-pipe solutions. This concept aims to solve the societal problems of the last century associated with the mass production and consumption of materials, and plays a prime role in providing a venous function in society, encouraging reuse and circulation of resources.One of the powerful solutions in the move toward GSC is the replacement of traditional synthetic methods using harmful stoichiometric reagents that produce vast amounts of waste with cleaner and simple catalytic alternatives with high atom efficiency 1a and low E-factors. 1b Catalytic chemistry, therefore, is of ever-increasing importance because catalysis is a key element in material transformations at atomic and molecular levels, which are an essential realm of chemistry and chemical processes.Our approach to GSC is to develop a highly functionalized heterogeneous metal catalyst based on the unique characteristics of natural layered inorganic materials such as hydroxyapatite, montmorillonite, and hydrotalcite, by using them as macroligands for metal species.2 We consider the above inorganic materials to be advanced nano-scaled catalyst supports allowing for the control of the location of catalytically active metal species, which can be found, for example, on the surface, among the layers, or in the interlayer space. Furthermore, these materials are capable of creating catalytically active metal species responsible for targeted organic transformations involving monomers, chain-like species or giant clusters. The creation of well-defined active metal sites on a solid surface, as characterized by X-ray absorption spectroscopy, not only opens up an avenue to materials that boost catalytic performance, but also aids in the understanding of the molecular basis of heterogeneous catalysis. Another advantage of these catalysts is the possibility of a one-pot synthesis based on a cooperative action by several immobilized active species on the solid surface as multifunctional catalysts. The target react...

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“…coordinately unsaturated aluminum cations, Al 3+ ) forming physisorbed SO 2 . The adsorption of SO 2 on the basic adsorption sites is followed by a cleavage of an Al O bond on the surface (primarily at OH sites or at exposed oxygen atoms, Table 1 Typical FTIR signals associated with common SOx species [7,[54][55][56][57][58][59][60][61][62][63][64][65][66][67].…”

Section: Pore Size Distributionmentioning

confidence: 99%

“…3b, spectrum iv). Note that it is difficult to follow the fate of the 1350 cm −1 at elevated temperatures since new bands starts to grow in the same spectral region at 673 K. The feature located at 1287 cm −1 together with the 1083 cm −1 feature can be attributed to bidentate sulfates interacting with the adsorbed water at 473-673 K [58] and orthochelating bidentate sulfates which reveal vibrational features in a similar range [64,69]. After the evacuation at 673 K, relatively wellresolved features are observed in the FTIR data (Fig.…”

Section: Speciesmentioning

confidence: 99%

SO uptake and release properties of TiO2/Al2O3 and BaO/TiO2/Al2O3 mixed oxide systems as NO storage materials

et al. 2012

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Structure of acid sites on sulfur-promoted iron oxide

Cited by 349 publications

References 1 publication

Characterization of NiSO₄Supported on Fe₂O₃and Catalytic Properties for Ethylene Dimerization

Characterization of NiSO₄Supported on Fe₂O₃and Catalytic Properties for Ethylene Dimerization

Design of High-Performance Heterogeneous Metal Catalysts for Green and Sustainable Chemistry

SO uptake and release properties of TiO2/Al2O3 and BaO/TiO2/Al2O3 mixed oxide systems as NO storage materials

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Structure of acid sites on sulfur-promoted iron oxide

Cited by 349 publications

References 1 publication

Characterization of NiSO4Supported on Fe2O3and Catalytic Properties for Ethylene Dimerization

Characterization of NiSO4Supported on Fe2O3and Catalytic Properties for Ethylene Dimerization

Design of High-Performance Heterogeneous Metal Catalysts for Green and Sustainable Chemistry

SO uptake and release properties of TiO2/Al2O3 and BaO/TiO2/Al2O3 mixed oxide systems as NO storage materials

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Characterization of NiSO₄Supported on Fe₂O₃and Catalytic Properties for Ethylene Dimerization

Characterization of NiSO₄Supported on Fe₂O₃and Catalytic Properties for Ethylene Dimerization