Search Results - "Graham, George W."

Catalyst Architecture for Stable Single Atom Dispersion Enables Site-Specific Spectroscopic and Reactivity Measurements of CO Adsorbed to Pt Atoms, Oxidized Pt Clusters, and Metallic Pt Clusters on TiO2 by DeRita, Leo, Dai, Sheng, Lopez-Zepeda, Kimberly, Pham, Nicholas, Graham, George W, Pan, Xiaoqing, Christopher, Phillip

“…Oxide-supported precious metal nanoparticles are widely used industrial catalysts. Due to expense and rarity, developing synthetic protocols that reduce…”
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Rh single atoms on TiO2 dynamically respond to reaction conditions by adapting their site by Tang, Yan, Asokan, Chithra, Xu, Mingjie, Graham, George W., Pan, Xiaoqing, Christopher, Phillip, Li, Jun, Sautet, Philippe

“…Single-atom catalysts are widely investigated heterogeneous catalysts; however, the identification of the local environment of single atoms under experimental…”
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Structural evolution of atomically dispersed Pt catalysts dictates reactivity by DeRita, Leo, Resasco, Joaquin, Dai, Sheng, Boubnov, Alexey, Thang, Ho Viet, Hoffman, Adam S., Ro, Insoo, Graham, George W., Bare, Simon R., Pacchioni, Gianfranco, Pan, Xiaoqing, Christopher, Phillip

“…The use of oxide-supported isolated Pt-group metal atoms as catalytic active sites is of interest due to their unique reactivity and efficient metal…”
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Dynamical Observation and Detailed Description of Catalysts under Strong Metal–Support Interaction by Zhang, Shuyi, Plessow, Philipp N, Willis, Joshua J, Dai, Sheng, Xu, Mingjie, Graham, George W, Cargnello, Matteo, Abild-Pedersen, Frank, Pan, Xiaoqing

“…Understanding the structures of catalysts under realistic conditions with atomic precision is crucial to design better materials for challenging…”
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In situ atomic-scale observation of oxygen-driven core-shell formation in Pt3Co nanoparticles by Dai, Sheng, You, Yuan, Zhang, Shuyi, Cai, Wei, Xu, Mingjie, Xie, Lin, Wu, Ruqian, Graham, George W., Pan, Xiaoqing

“…The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction…”
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Revealing Surface Elemental Composition and Dynamic Processes Involved in Facet-Dependent Oxidation of Pt3Co Nanoparticles via in Situ Transmission Electron Microscopy by Dai, Sheng, Hou, Yusheng, Onoue, Masatoshi, Zhang, Shuyi, Gao, Wenpei, Yan, Xingxu, Graham, George W, Wu, Ruqian, Pan, Xiaoqing

“…Since catalytic performance of platinum–metal (Pt–M) nanoparticles is primarily determined by the chemical and structural configurations of the outermost…”
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Dynamic structural evolution of supported palladium–ceria core–shell catalysts revealed by in situ electron microscopy by Zhang, Shuyi, Chen, Chen, Cargnello, Matteo, Fornasiero, Paolo, Gorte, Raymond J., Graham, George W., Pan, Xiaoqing

“…The exceptional activity for methane combustion of modular palladium–ceria core–shell subunits on silicon-functionalized alumina that was recently reported has…”
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Uniform Pt/Pd Bimetallic Nanocrystals Demonstrate Platinum Effect on Palladium Methane Combustion Activity and Stability by Goodman, Emmett D, Dai, Sheng, Yang, An-Chih, Wrasman, Cody J, Gallo, Alessandro, Bare, Simon R, Hoffman, Adam S, Jaramillo, Thomas F, Graham, George W, Pan, Xiaoqing, Cargnello, Matteo

“…Bimetallic catalytic materials are in widespread use for numerous reactions, as the properties of a monometallic catalyst are often improved upon addition of a…”
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Distribution of Pt single atom coordination environments on anatase TiO2 supports controls reactivity by Zang, Wenjie, Lee, Jaeha, Tieu, Peter, Yan, Xingxu, Graham, George W., Tran, Ich C., Wang, Peikui, Christopher, Phillip, Pan, Xiaoqing

“…Single-atom catalysts (SACs) offer efficient metal utilization and distinct reactivity compared to supported metal nanoparticles. Structure-function…”
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Improved Thermal Stability and Methane-Oxidation Activity of Pd/Al2O3 Catalysts by Atomic Layer Deposition of ZrO2 by Onn, Tzia Ming, Zhang, Shuyi, Arroyo-Ramirez, Lisandra, Chung, Yu-Chieh, Graham, George W, Pan, Xiaoqing, Gorte, Raymond J

“…The effect of modifying Pd/Al2O3 catalysts by atomic layer deposition of 1 nm ZrO2 films was studied. For deposition on oxidized, PdO/Al2O3 catalysts, TEM…”
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In Situ Observation of Rh-CaTiO3 Catalysts during Reduction and Oxidation Treatments by Transmission Electron Microscopy by Dai, Sheng, Zhang, Shuyi, Katz, Michael B, Graham, George W, Pan, Xiaoqing

“…Scanning transmission electron microscopy of high-surface-area Rh-doped CaTiO3 powder, conducted near atmospheric pressure at elevated temperature (250–700 °C)…”
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Deconvolution of octahedral Pt3Ni nanoparticle growth pathway from in situ characterizations by Shen, Xiaochen, Zhang, Changlin, Zhang, Shuyi, Dai, Sheng, Zhang, Guanghui, Ge, Mingyuan, Pan, Yanbo, Sharkey, Stephen M., Graham, George W., Hunt, Adrian, Waluyo, Iradwikanari, Miller, Jeffrey T., Pan, Xiaoqing, Peng, Zhenmeng

“…Understanding the growth pathway of faceted alloy nanoparticles at the atomic level is crucial to morphology control and property tuning. Yet, it remains a…”
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Reversible precipitation/dissolution of precious-metal clusters in perovskite-based catalyst materials: Bulk versus surface re-dispersion by Katz, Michael B., Zhang, Shuyi, Duan, Yingwen, Wang, Hongjie, Fang, Minghao, Zhang, Kui, Li, Baihai, Graham, George W., Pan, Xiaoqing

“…Pt-rich clusters can reversibly precipitate from, and dissolve into, a Pt-doped CaTiO3 perovskite support under reducing and oxidizing conditions,…”
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Self-Regeneration of Pd–LaFeO3 Catalysts: New Insight from Atomic-Resolution Electron Microscopy by Katz, Michael B, Graham, George W, Duan, Yingwen, Liu, Hong, Adamo, Carolina, Schlom, Darrell G, Pan, Xiaoqing

“…Aberration-corrected transmission electron microscopy was used to study atomic-scale processes in Pd–LaFeO3 catalysts. Clear evidence for diffusion of Pd into…”
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Lithiation of Rutile TiO2‑Coated Si NWs Observed by in Situ TEM by Kim, Sung Joo, Kargar, Alireza, Wang, Deli, Graham, George W, Pan, Xiaoqing

“…Lithiation of rutile TiO2 coated Si NWs was performed inside a transmission electron microscope. TiO2 coatings with sufficiently large coating thickness-to-NW…”
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The application of holography to the analysis of size and settling velocity of suspended cohesive sediments by Graham, George W., Nimmo Smith, W. Alex M.

“…Suspended cohesive sediments commonly occur in flocculated form. The flocculation process significantly increases particle size, settling velocity, and…”
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Nature of the two-step temperature-programmed decomposition of PdO supported on alumina by Chen, Xiaoyin, Schwank, Johannes W., Fisher, Galen B., Cheng, Yisun, Jagner, Mark, McCabe, Robert W., Katz, Michael B., Graham, George W., Pan, Xiaoqing

“…•PdO on alumina decomposes in a two-step process during thermal ramping.•Decomposition initiates at the PdO surface near the bulk PdO decomposition temperature…”
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Quantitative and Atomic-Scale View of CO-Induced Pt Nanoparticle Surface Reconstruction at Saturation Coverage via DFT Calculations Coupled with in Situ TEM and IR by Avanesian, Talin, Dai, Sheng, Kale, Matthew J, Graham, George W, Pan, Xiaoqing, Christopher, Phillip

“…Atomic-scale insights into how supported metal nanoparticles catalyze chemical reactions are critical for the optimization of chemical conversion processes. It…”
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Adsorbate-mediated strong metal–support interactions in oxide-supported Rh catalysts by Matsubu, John C., Zhang, Shuyi, DeRita, Leo, Marinkovic, Nebojsa S., Chen, Jingguang G., Graham, George W., Pan, Xiaoqing, Christopher, Phillip

“…The optimization of supported metal catalysts predominantly focuses on engineering the metal site, for which physical insights based on extensive theoretical…”
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Uniformity Is Key in Defining Structure–Function Relationships for Atomically Dispersed Metal Catalysts: The Case of Pt/CeO2 by Resasco, Joaquin, DeRita, Leo, Dai, Sheng, Chada, Joseph P, Xu, Mingjie, Yan, Xingxu, Finzel, Jordan, Hanukovich, Sergei, Hoffman, Adam S, Graham, George W, Bare, Simon R, Pan, Xiaoqing, Christopher, Phillip

“…Catalysts consisting of atomically dispersed Pt (Ptiso) species on CeO2 supports have received recent interest due to their potential for efficient metal…”
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