Journal ArticleDOI
Structural determination of bulk and surface tungsten oxides with UV-vis diffuse reflectance spectroscopy and raman spectroscopy
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In this paper, the electronic and molecular structures of well-defined W(VI) bulk mixed oxide reference compounds consisting of isolated WO4 or WO6 monomers, dimeric O3W−O−WO3, polymeric chain of alternating WO 4/WO6 units, and WO 6-coordinated W9−W18 clusters were examined.Abstract:
Combined UV−vis diffuse reflectance spectroscopy (DRS) and Raman spectroscopy were applied to examine the electronic and molecular structures, respectively, of well-defined W(VI) bulk mixed oxide reference compounds consisting of (i) isolated WO4 or WO6 monomers, (ii) dimeric O3W−O−WO3, (iii) polymeric chain of alternating WO4/WO6 units, and (iv) WO6-coordinated W9−W18 clusters. Raman spectroscopy was employed to confirm the identity and phase purity of the different tungsten oxide structures. UV−vis DRS provided the corresponding electronic edge energy (Eg) of the ligand-to-metal charge transfer (LMCT) transitions of the W(VI) cations. A correlation between the edge energy and the number of covalent bridging W−O−W bonds around the central W(VI) cation was found with Eg linearly decreasing with increasing number of bridging W−O−W bonds. However, a direct relationship between Eg and the domain size, NW, for finite WOx clusters does not exist. Subsequently, UV−vis and Raman spectroscopy information were app...read more
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Surface Organometallic and Coordination Chemistry toward Single-Site Heterogeneous Catalysts: Strategies, Methods, Structures, and Activities
Christophe Copéret,Aleix Comas-Vives,Matthew P. Conley,Deven P. Estes,Alexey Fedorov,Victor Mougel,Haruki Nagae,Haruki Nagae,Francisco Núñez-Zarur,Pavel A. Zhizhko,Pavel A. Zhizhko +10 more
TL;DR: Site Heterogeneous Catalysts: Strategies, Methods, Structures, and Activities
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A Perspective on the Selective Catalytic Reduction (SCR) of NO with NH3 by Supported V2O5–WO3/TiO2 Catalysts
Jun-Kun Lai,Israel E. Wachs +1 more
TL;DR: The supported V2O5-WO3/TiO2 catalysts have become the most widely used industrial catalysts for selective catalytic reduction (SCR) applications since introduction of this technology in the early 1970s as mentioned in this paper.
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Simple synthesis of amorphous NiWO4 nanostructure and its application as a novel cathode material for asymmetric supercapacitors.
Lengyuan Niu,Zhangpeng Li,Ye Xu,Jinfeng Sun,Wei Hong,Xiaohong Liu,Jinqing Wang,Shengrong Yang +7 more
TL;DR: This study reports a simple synthesis of amorphous nickel tungstate (NiWO4) nanostructure and its application as a novel cathode material for supercapacitors and results demonstrate that the material synthesized at 70 °C has shown the highest specific capacitance.
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Monitoring surface metal oxide catalytic active sites with Raman spectroscopy
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Journal ArticleDOI
Olefin Metathesis by Supported Metal Oxide Catalysts
Soe Lwin,Israel E. Wachs +1 more
TL;DR: The literature of olefin metathesis by heterogeneous supported catalysts, both industrial-type supported metal oxides (ReOx/Al2O3, ReOx/(SiO2−Al 2O3) and supported organometallic complexes, is comprehensively reviewed in this paper.
References
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Book
Infrared and Raman Spectra of Inorganic and Coordination Compounds
TL;DR: In this article, the normal modes of vibration are illustrated and corresponding vibrational frequencies are listed for each type, including diatomic, triatomic, fouratomic, five-atomic, six-atomic and seven-atomic types.
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TL;DR: In this article, the fundamentals of adsorption, structural and dynamical considerations, isotherms and energetics characterizing catalysts and their surfaces, the significance of pore structure and surface area in heterogeneous catalysis, the solid-state and surface chemistry of catalysts poisoning, promotion, deactivation and selectivity, catalytic process engineering, and case histories.
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Olefin metathesis and metathesis polymerization
Kenneth J. Ivin,I. C Mol +1 more
TL;DR: The metal carbene/metallacyclobutane mechanism has been studied extensively in the literature as mentioned in this paper, with a focus on the use of a ring-opening metathesis.