skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Investigation of Silica-Supported Vanadium Oxide Catalysts by High-Field 51 V Magic-Angle Spinning NMR

Journal Article · · Journal of Physical Chemistry. C

Supported V2O5/SiO2 catalysts were studied using solid state 51V MAS NMR at a sample spinning rate of 36 kHz and at a magnetic field of 19.975 T for a better understanding of the coordination of the vanadium oxide as a function of environmental conditions . Structural transformations of the supported vanadium oxide species between the catalyst in the dehydrated state and hydrated state under an ambient environment were revisited to examine the degree of oligomerization and the effect of water. The experimental results indicate the existence of a single dehydrated surface vanadium oxide species that resonates at -675 ppm and two vanadium oxide species under ambient conditions that resonate at -566 and -610 ppm, respectively. No detectable structural difference was found as a function of vanadium oxide loading on SiO2 (3% V2O5/SiO2 and 8% V2O5/SiO2). Quantum chemistry simulations of the 51V NMR chemical shifts on predicted surface structures were used as an aide in understanding potential surface vanadium oxide species on the silica support. The results suggest the formation of isolated surface VO4 units for the dehydrated catalysts with the possibility of dimer and cyclic trimer presence. The absence of bridging V-O-V vibrations (~200-300 cm-1) in the Raman spectra [Gao et al. J. Phys. Chem. B 1998, 102, 10842-10852], however, indicates that the isolated surface VO4 sites are the dominant dehydrated surface vanadia species on silica. Upon exposure to water, hydrolysis of the bridging V-O-Si bonds is most likely responsible for the decreased electron shielding experienced by vanadium. No indicators for the presence of hydrated decavanadate clusters or hydrated vanadia gels previously proposed in the literature were detected in this study.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1399179
Report Number(s):
PNNL-SA-124184; 49339; KC0302010
Journal Information:
Journal of Physical Chemistry. C, Vol. 121, Issue 11; ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

References (56)

The generality of surface vanadium oxide phases in mixed oxide catalysts journal January 2011
Structure of flame-made vanadia/silica and catalytic behavior in the oxidative dehydrogenation of propane journal August 2010
Modelling one- and two-dimensional solid-state NMR spectra: Modelling 1D and 2D solid-state NMR spectra journal December 2001
Density-functional exchange-energy approximation with correct asymptotic behavior journal September 1988
Single-Site VO x Moieties Generated on Silica by Surface Organometallic Chemistry: A Way To Enhance the Catalytic Activity in the Oxidative Dehydrogenation of Propane journal August 2016
Topology of the pyroxenes as a function of temperature, pressure, and composition as determined from the procrystal electron density journal April 2003
Recent conceptual advances in the catalysis science of mixed metal oxide catalytic materials journal February 2005
VO x /SiO 2 Catalyst Prepared by Grafting VOCl 3 on Silica for Oxidative Dehydrogenation of Propane journal September 2015
Structure of V 2 O 5 · n H 2 O Xerogels journal February 2016
Investigation of the Structure and Active Sites of TiO 2 Nanorod Supported VO x Catalysts by High-Field and Fast-Spinning 51 V MAS NMR journal June 2015
Chemistry with ADF journal January 2001
Ab Initio Study of the Hydroxylated Surface of Amorphous Silica: A Representative Model journal May 2008
Structural study of gels of V2O5: Normal coordinate analysis journal January 1985
Selective Catalytic Reduction of NO with NH3over Supported Vanadia Catalysts journal June 1996
Bonding states of surface vanadium(V) oxide phases on silica: structural characterization by vanadium-51 NMR and Raman spectroscopy journal August 1993
Enhanced Two-Dimensional Dispersion of Group V Metal Oxides on Silica journal September 2015
Fifty years of my romance with vanadium oxide catalysts journal April 2009
Structure and properties of amorphous V 2 O 5 journal April 1991
Xanes and 51V Nmr study of vanadium-oxygen compounds journal January 1990
Vanadia Gel Synthesis via Peroxovanadate Precursors. 2. Characterization of the Gels journal October 2001
Vibrational spectra of alumina- and silica-supported vanadia revisited: An experimental and theoretical model catalyst study journal August 2004
Hydration effects on the molecular structure of silica-supported vanadium oxide catalysts: A combined IR, Raman, UV–vis and EXAFS study journal January 2007
Analysis of silica-supported vanadia by X-ray absorption spectroscopy: Combined theoretical and experimental studies journal March 2009
Characterization of Supported Vanadium Oxide Species on Silica: A Periodic DFT Investigation journal May 2009
Analysis of XANES for identification of highly dispersed transition metal oxides on supports journal January 1992
Efficient implementation of the gauge-independent atomic orbital method for NMR chemical shift calculations journal November 1990
Possibility of VOx/SiO2 Complexes Speciation: Comparative Multi-wavelength Raman and DR UV-vis Study journal January 2013
Effect of Milling of V 2 O 5 on the Local Environment of Vanadium as Studied by Solid-State 51 V NMR and Complementary Methods journal April 1999
Vanadium oxide monolayer catalysts. 3. A Raman spectroscopic and temperature-programmed reduction study of monolayer and crystal-type vanadia on various supports journal October 1980
Density functional calculations of nuclear magnetic shieldings using the zeroth-order regular approximation (ZORA) for relativistic effects: ZORA nuclear magnetic resonance journal April 1999
Elucidation of Anchoring and Restructuring Steps during Synthesis of Silica-Supported Vanadium Oxide Catalysts journal June 2016
Quantitative Determination of the Speciation of Surface Vanadium Oxides and Their Catalytic Activity journal May 2006
Towards an order- N DFT method
  • Fonseca Guerra, C.; Snijders, J. G.; te Velde, G.
  • Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta), Vol. 99, Issue 6 https://doi.org/10.1007/s002140050353
journal November 1998
Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density journal January 1988
Fundamental Studies of Butane Oxidation over Model-Supported Vanadium Oxide Catalysts: Molecular Structure-Reactivity Relationships journal August 1997
Catalysis science of supported vanadium oxide catalysts journal January 2013
Surface chemistry and reactivity of well-defined multilayered supported M1Ox/M2Ox/SiO2 catalysts journal August 2008
Density functional theory with dispersion corrections for supramolecular structures, aggregates, and complexes of (bio)organic molecules journal January 2007
51V NMR parameters of VOCl 3 : static and dynamic density functional study from the gas phase to the bulk journal January 2011
Preparation and in-Situ Spectroscopic Characterization of Molecularly Dispersed Titanium Oxide on Silica journal July 1998
Influence of pH and ionic strength on vanadium( v ) oxides formation. From V 2 O 5 ·nH 2 O gels to crystalline NaV 3 O 8 ·1.5H 2 O journal January 2005
In Situ Spectroscopic Investigation of Molecular Structures of Highly Dispersed Vanadium Oxide on Silica under Various Conditions journal December 1998
Optimized Slater-type basis sets for the elements 1-118 journal May 2003
Predicting molecular structures of surface metal oxide species on oxide supports under ambient conditions journal July 1991
51V NMR and EPR Study of Reaction Kinetics and Mechanisms in V2O5 Gelation by Ion Exchange of Sodium Metavanadate Solutions journal April 1994
Characterization of V 2 O 5 −TiO 2 Catalysts Prepared by Milling by ESR and Solid State 1 H and 51 V NMR journal August 1999
Study of the Structure and Mechanism of Formation through Self-Assembly of Mesostructured Vanadium Oxide journal December 1997
Effects of Hydration and Dehydration on the Structure of Silica-Supported Vanadia Species journal September 2000
Density functional theory study of the oxoperoxo vanadium(V) complexes of glycolic acid. Structural correlations with NMR chemical shifts journal January 2009
Structural study of gels of V2O5: Vibrational spectra of xerogels journal March 1985
Calculation of NMR Shielding Tensors Using Gauge-Including Atomic Orbitals and Modern Density Functional Theory journal January 1995
17 O MAS and 3QMAS NMR Investigation of Crystalline V 2 O 5 and Layered V 2 O 5 · n H 2 O Gels journal July 2002
Solid-state NMR for characterization of vanadium-containing systems journal February 2003
In situ laser Raman spectroscopy of supported metal oxides journal November 1984
Relativistic regular two‐component Hamiltonians journal September 1993
Multiwavelength Raman Spectroscopic Study of Silica-Supported Vanadium Oxide Catalysts journal November 2009

Cited By (9)

Proof of Equivalent Catalytic Functionality upon Photon-Induced and Thermal Activation of Supported Isolated Vanadia Species in Methanol Oxidation journal April 2018
Mechanism by which Tungsten Oxide Promotes the Activity of Supported V 2 O 5 /TiO 2 Catalysts for NO X Abatement: Structural Effects Revealed by 51 V MAS NMR Spectroscopy journal July 2019
Structural characterization of vanadium environments in MCM-41 molecular sieve catalysts by solid state 51 V NMR journal January 2019
Photocatalytic Methanol Oxidation by Supported Vanadium Oxide Species: Influence of Support and Degree of Oligomerization: Photocatalytic Methanol Oxidation by Supported Vanadium Oxide Species: Influence of Support and Degree of Oligomerization journal August 2018
Proof of Equivalent Catalytic Functionality upon Photon-Induced and Thermal Activation of Supported Isolated Vanadia Species in Methanol Oxidation journal June 2018
Computational study on epoxidation of propylene by dioxygen using the silanol-functionalized polyoxometalate-supported osmium oxide catalyst journal January 2019
Palladium/Zeolite Low Temperature Passive NOx Adsorbers (PNA): Structure-Adsorption Property Relationships for Hydrothermally Aged PNA Materials journal September 2019
Grafting metal complexes onto amorphous supports: from elementary steps to catalyst site populations via kernel regression journal January 2020
Mechanism by which Tungsten Oxide Promotes the Activity of Supported V 2 O 5 /TiO 2 Catalysts for NO X Abatement: Structural Effects Revealed by 51 V MAS NMR Spectroscopy journal September 2019

Similar Records

Investigation of Silica-Supported Vanadium Oxide Catalysts by High-Field 51V Magic-Angle Spinning NMR
Journal Article · Mon Feb 27 00:00:00 EST 2017 · Journal of Physical Chemistry. C · OSTI ID:1399179

Multi-wavelength Raman Spectroscopic Study of Silica-supported Vanadium Oxide Catalysts
Journal Article · Fri Jan 01 00:00:00 EST 2010 · Journal of Physical Chemistry C · OSTI ID:1399179

Structural characteristics and reactivity/reducibility properties of dispersed and bilayered V{sub 2}O{sub 5}/TiO{sub 2}/SiO{sub 2} catalysts
Journal Article · Thu Jan 28 00:00:00 EST 1999 · Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical · OSTI ID:1399179