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学术报告:Catalytic Systems Based on Porous Fibers and Metal Nanocrystals

2016-07-13

主题: Catalytic Systems Based on Porous Fibers and Metal Nanocrystals主讲人: Dr. Ping Lu地点: 东华大学研究院209会议室时间: 2016-07-14 14:00:00组织单位: 纺织学院

主讲人简介:

Dr. Ping Lu is an Assistant Professorin the Department of Chemistry and Biochemistry at the Long Island UniversityBrooklyn. He received his Ph.D. in Agricultural & Environmental Chemistrywith a focus on polymer and materials chemistry from the University ofCalifornia Davis. He then worked as a postdoctoral fellow at the WashingtonUniversity in St. Louis and the Georgia Institute of Technology. His researchinvolves the synthesis, fabrication and characterization of polymeric andinorganic nanostructures for energy, environmental and health applications. Dr.Lu has published a number of peer-reviewed research papers in leading journalsin chemistry and materials science such as Journalof the American Chemical Society, AngewandteChemie International Edition, and NanoLetters. Dr. Lu is actively serving the scientific community by acting asan Editorial Board Member of CarbohydratePolymers and as a regular Reviewer for a number of top scientific journalsin chemistry and materials science. He has closely collaborated with industrialpartners including BASF and Toyota in developing new catalysts. These findingshave been used to guide the design and synthesis of commercial catalysts forenvironmental applications.


报告摘要:

Heterogeneous catalysis is ofvital importance to the world’s economy and the sustainable development of oursociety. Catalyst sintering, the loss of activity and/or selectivity at hightemperatures, is a great challenge and continuing concern in the application ofheterogeneous catalysts. Although it is inevitable that all catalysts willsinter and deactivate over time, its immediate and drastic consequences can beavoided or postponed by a rational design of the catalyst structure. In mystudy, I employed porous fibers as a new form of catalyst supporting materialsto enhance the sinter-resistance of catalyst nanoparticles. Porous fibers werefabricated by a rapid phase separation during electrospinning and/or thefollowing calcination. The high surface area and porosity of fibers increasedthe distance among catalyst nanoparticles. The strong interactions betweenoxides and metal nanoparticles as well as the site-selective protective layerssignificantly stabilized catalysts and retained their catalytic activity.Moreover, metal nanocrystals (e.g., palladium) with precisely controlled sizesand shapes were synthesized and applied as catalysts to study their sinteringbehaviors under real application conditions. In addition, the sulfurization ofpalladium nanocubes was studied to understand the deactivation mechanism ofmetal nanocrystals through sulfur poisoning.


讲座语言:英文


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