470177 Experimentally Probing Ligand-Strain Effect Via a Novel Catalyst Platform

Wednesday, November 16, 2016: 4:15 PM
Golden Gate (Hotel Nikko San Francisco)
Shuai Tan1,2, Shibely Saha2, Lucun Wang1,3, Gregory S. Yablonsky4,5, John T. Gleaves4, Rebecca Fushimi1,3 and Dongmei (Katie) Li1,2, (1)Center for Advanced Energy Studies, Idaho Falls, ID, (2)Chemical Engineering Department, University of Wyoming, Laramie, WY, (3)Biological and Chemical Processing Department, Idaho National Laboratory, Idaho Falls, ID, (4)Department of Energy, Environmental and Chemical Engineering, Washington University in Saint Louis, St. Louis, MO, (5)Parks College, Department of Chemistry, Saint Louis University, St. Louis, MO

In this presentation, a novel catalyst fabrication platform was designed and investigated. Using a phase-pure transition metal carbide (TMC) nanotube as support [1], noncontiguous platinum group metal (PGM) particles were deposited from atomic level to 2-3 nanometers (nm) onto the TMC support by atomic layer deposition [2]. This platform enables experimental investigation on ligand-strain effect of resultant PGM/TMC catalysts. Characterization of metal-adsorbates bond strength, via diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) [3] and temperature-programmed oxidation (TPO), informs catalyst surface properties and model reaction mechanism [4]. Temporal analysis of products (TAP) technique was first applied to this catalyst platform revealing the existence of different active sites for Pt particle sizes (<3 nm). Additionally, the correlation between catalyst reactivity and change of deposited particle size was further investigated using water-gas-shift (WGS) reaction. The rarely investigated PGM particle size range and the ease of surface characterization by high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and other techniques, provides a unique PGM/TMC platform, which can be utilized closely with theoretical predictions to further our understanding on the interaction between PGM and non-PGM metals.


[1] Wan, C.; Regmi, Y. N.; Leonard, B. M. Angew. Chemie Int. Ed. 2014, 53(25), 6407–6410.

[2] McCormick, J. A.; Cloutier, B. L.; Weimer, A. W.; George, S. M. J. Vac. Sci. Technol. A Vacuum, Surfaces, Film. 2007, 25(1), 67.

[3] Ding, K.; Gulec, A.; Johnson, A. M.; Schweitzer, N. M.; Stucky, G. D.; Marks, L. D.; Stair, P. C. Science. 2015, 350 (6257), 1688–1690.

[4] Schweitzer, N. M.; Schaidle, J. a; Ezekoye, O. K.; Pan, X.; Linic, S.; Thompson, L. T. J. Am. Chem. Soc. 2011, 133, 2378–2381.

Extended Abstract: File Not Uploaded