Pulsed EPR Studies of Transition Metal-Exchanged Zeolites and Molecular Sieves
EMSL Project ID
2567
Abstract
In ongoing work in my laboratory, we are using CW EPR spectroscopy to study transition metal-exchanged zeolites and molecular sieves. Transition metal-exchanged zeolites are active catalysts for the selective catalytic reduction of nitric oxide and for selective oxidation reactions. So far, we have focused on measuring vanadium g and A values for vanadium-exchanged zeolites and molecular sieves. We have recently initiated studies of molybdenum-exchanged zeolites. We would also like to conduct pulsed EPR experiments at PNNL on these transition metal-exchanged zeolites. The pulsed EPR experiments will provide us with a more direct probe of transition metal-ligand interactions. The pulsed EPR experiments will allow us to address questions related to how the ligand interacts with the transition metal center and will provide insight into the identity of the ligands in the first coordination sphere of the transition metal center.
Project Details
Project type
Capability Research
Start Date
2002-05-01
End Date
2005-05-01
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Amonette JE, O Qafoku, TW Wietsma, PM Jeffers, CK Russell, and MJ Truex. 2009. Carbon Tetrachloride and Chloroform Attenuation Parameter Studies: Heterogeneous Hydrolytic Reactions -- Status Report . PNNL-18735, Pacific Northwest National Laboratory, Richland, WA. 44 pp.
Amonette JE, O Qafoku, TW Wietsma, PM Jeffers, CK Russell, and MJ Truex. 2010. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY2009. PNNL-19142, Pacific Northwest National Laboratory, Richland, WA. 42 pp.
Boyd V, H Yoon, C Zhang, M Oostrom, NJ Hess, BW Fouke, AJ Valocchi, and CJ Werth. 2014. "Influence of Mg2+ on CaCO3 precipitation during subsurface reactive transport in a homogeneous silicon-etched pore network." Geochimica et Cosmochimica Acta 135:321-335. doi:10.1016/j.gca.2014.03.018
Dehoff, K., C. Zhang, and C.J. Werth. 2008. Pore-scale Investigation of Calcite Precipitation and Permeability Changes in Silicon- based Micromodels. American Geophysical Union Fall Meeting. San Francisco. H23D-0934.
Hallam SJ, AP Page, L Constan, YC Song, AD Norbeck, HM Brewer, and L Pasa-Tolic. 2011. "Molecular tools for investigating ANME community structure and function." Chapter 4 in Methods in Enzymology, Part A, vol. 494, ed. AC Rosenzweig and SW Ragsdale, pp. 75-90. Elsevier/Academic Press, Amsterdam, Netherlands.
Oostrom, M., C. Werth, T. Wietsma, and N. Hess. 2008. The Microfluidics Flow and Transport Laboratory: A New User Facility at PNNLs Environmental Molecular Sciences Laboratory. American Geophysical Union Fall Meeting. H41F-0937.
Robert J. Hamers, Scott A. Chambers, Paul E. Evans, Ryan Franking, Zachary Gerbec, Padma Gopalan, Heesuk Kim, Elizabeth C. Landis, Bo Li, Michael W. McCoy, Takeo Ohsawa, and Rose Ruther,
"Molecular and Biomolecular Interfaces to Metal Oxide Semiconductors", Physica Status Solidi, submitted for publication 7/09
Ryan A. Franking, Elizabeth C. Landis, and Robert J. Hamers, ?Highly Stable Molecular Layers on Nanocrystalline Anatase through Photochemical Grafting?, Langmuir, Submitted 3/09.
Using dispersivity values to quantify the effects of pore-scale flow focusing on enhanced reaction along a transverse mixing zone
Werth, C., C. Zhang, W. Lindsay, H. Yoon, S. Nellis, A. Valocchi, and M. Oostrom. 2008. Physical and Chemical Properties that Give Rise to Flow ByPassing in DNAPL Impacted Groundwater Source Zones. American Geophysical Union Fall Meeting, San Francisco. H33J-08 INVITED.
Willingham TW, CJ Werth, and AJ Valocchi. 2008. "Evaluation of the Effects of Porous Media Structure on Mixing-Controlled Reactions Using Pore-Scale Modeling and Micromodel Experiments." Environmental Science & Technology 42(9):3185–3193. doi:10.1021/es7022835
Zhang, C., K. Dehoff, C.J. Werth, A.J. Valachhi, M. Oostrom, and T.W. Wietsma. 2009. Pore-scale investigation of mixing-induced calcite precipitation in silicon-based micromodels. Eos Trans. American Geophysical Union, 90(52), Fall Meet. Suppl., Abstract U41A-0012.
Zhang C, M Oostrom, JW Grate, TW Wietsma, and MG Warner. 2011. "Liquid CO2 Displacement of Water in a Dual-Permeability Pore Network Micromodel." Environmental Science & Technology 45(17):7581-7588. doi:10.1021/es201858r
Zhang C, M Oostrom, TW Wietsma, JW Grate, and MG Warner. 2011. "Influence of Viscous and Capillary Forces on Immiscible Fluid Displacement: Pore-Scale Experimental Study in a Water-Wet Micromodel Demonstrating Viscous and Capillary Fingering." Energy and Fuels 25(8):3493-3505. doi:10.1021/ef101732k
Zhang C, Q Kang, X Wang, JL Zilles, RH Muller, and CJ Werth. 2010. "Effects of Pore-Scale Heterogeneity and Transverse Mixing on Bacterial Growth in Porous Media." Environmental Science & Technology 44(8):3085-3092.