报告题目：基于多孔纤维和金属纳米晶体的催化体系(Catalytic Systems Based on Porous Fibers and Metal Nanocrystals)

   报告人：吕平

   报告时间：2016年7月19日(星期二)  上午9:00~11:30

   报告地点：工程楼604室

   报告人简介：

   吕平，博士，美国长岛大学化学与生物化学系助理教授。于2009年在美国加州大学戴维斯分校获得博士学位，并先后在美国圣路易斯华盛顿大学、佐治亚理工学院开展博士后研究。现担任Carbohydrate Polymers编委。研究方向聚焦于应用于能源、环境、健康领域的聚合物和无机纳米结构的合成、制备和表征。先后在Journal of the American Chemical Society、Angewandte Chemie International Edition、Nano Letters等期刊发表论文30余篇。积极同工业界企业开展合作致力于开发新型催化剂，部分合作成果已应用于指导环境领域商业催化剂的设计与合成。

   学术报告的英文摘要如下：

Heterogeneous catalysis is of vital importance to the world’s economy and the sustainable development of our society. Catalyst sintering, the loss of activity and/or selectivity at high temperatures, is a great challenge and continuing concern in the application of heterogeneous catalysts. Although it is inevitable that all catalysts will sinter and deactivate over time, its immediate and drastic consequences can be avoided or postponed by a rational design of the catalyst structure. In my study, I employed porous fibers as a new form of catalyst supporting materials to enhance the sinter-resistance of catalyst nanoparticles. Porous fibers were fabricated by a rapid phase separation during electrospinning and/or the following calcination. The high surface area and porosity of fibers increased the distance among catalyst nanoparticles. The strong interactions between oxides and metal nanoparticles as well as the site-selective protective layers significantly stabilized catalysts and retained their catalytic activity. Moreover, metal nanocrystals (e.g., palladium) with precisely controlled sizes and shapes were synthesized and applied as catalysts to study their sintering behaviors under real application conditions. In addition, the sulfurization of palladium nanocubes was studied to understand the deactivation mechanism of metal nanocrystals through sulfur poisoning.

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