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.