关于举行美国哥伦比亚大学陈经广教授系列学术报告会的通知

发布时间:2017-08-11设置

报 告 一:Unique Properties of Carbide and Bimetallic Catalysts (碳化物与双金属催化剂的独特性质)

报 告 人:Prof. Jingguang Chen(陈经广教授), Columbia University

报告时间:2017821 10:00-11:30

报告地点:五山校区逸夫工程馆105会议室

报告摘要:Platinum-group metal catalysts are extensively used in chemical/petroleum industries and in emerging clean energy technologies. Bimetallic and carbide catalysts offer the possibility to either substantially reduce the loading of Pt-group metals or completely replace them. In the current talk we will present our experimental and theoretical efforts in understanding the unique catalytic activity, selectivity and stability of these materials. We will focus on how the formation of bimetallic alloys and metal carbides leads to different electronic properties and correspondingly unique catalytic performance as compared to those of the parent metals. After an introduction on the general trends of bimetallic and carbide catalysts, two examples will be used to illustrate their potential applications in thermocatalysis and electrocatalysis. For thermocatalysis, the hydrodeoxygenation (HDO) of biomass-derived oxygenates will be used to demonstrate the distinct reaction pathways to selectively cleave the carbon-oxygen bonds without carbon-carbon bond scission. For electrocatalysis, water electrolysis will be discussed to show the feasibility of using monolayer Pt on metal carbides to achieve the same activity as bulk Pt for the hydrogen evolution reaction. In both examples special emphasis will be on the challenges in maintaining the desired electronic and structural properties of carbide and bimetallic catalysts under reaction conditions.

 

 

报 告 二:Converting Carbon Dioxide through Thermocatalysis and Electrocatalysis (通过热催化与电催化实现二氧化碳转化)

报 告 人:Prof. Jingguang Chen(陈经广教授), Columbia University

报告时间:2017821 14:00-15:30

报告地点:五山校区逸夫工程馆105会议室

报告摘要:Rising atmospheric concentration of CO2 is forecasted to have potentially disastrous effects on the environment from its role in global warming and ocean acidification. Converting CO2 into valuable chemicals and fuels is one of the most practical routes for reducing CO2 emissions while fossil fuels continue to dominate the energy sector. The catalytic reduction of CO2 by H2 can lead to the formation of three types of products: CO through the reverse water-gas shift (RWGS) reaction, methanol via selective hydrogenation, and methane by the methanation pathway. In the current talk we will first describe our efforts in controlling the catalytic selectivity for the three products using a combination of DFT calculations and surface science studies over single crystal surfaces, catalytic evaluation of supported catalysts, and in-situ characterization under reaction conditions. Next, we will discuss our efforts in converting CO2 without using H2. This is motivated by the fact that ~95% of H2 is generated from hydrocarbon-based feedstocks, producing CO2 as a byproduct. We will present two approaches to avoid using H2 for CO2 conversion. The first approach involves the utilization of light alkanes, such as ethane, to directly reduce CO2 via the dry reforming pathway to produce synthesis gas (C2H6 + 2CO2 → 4CO + 3H2) and the oxidative dehydrogenation route to generate ethylene (C2H6 + CO2 → C2H4 + CO + H2O). The second approach is the electrolysis of CO2 to produce synthesis gas with controlled CO/H2 ratios. We will conclude our presentation by providing a perspective on the challenges and opportunities in converting CO2 via various routes in thermocatalysis and electrocatalysis.

欢迎广大师生前往!

 

 

化学与化工学院

2017811

 


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