Lecture Kathrin Muller
|07 March 2011||FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. Kathrin Muller|
|Affiliation:||Brookhaven National Laboratory, Upton, NY, USA|
|Title:||A surface science approach to to alternative CO2 capture and utilization routes|
|Date:||Mon Mar 7, 2011|
|Host:||Dr. Meike Stöhr|
|Telephone:||+31 50 363 4438|
Fossil-fuel power plants are among the largest CO2 emission sources accounting for approximately one-third of the anthropogenic CO2 emission. Due to increasing energy demands and slow deployment of clean energy alternatives, a practical near term route to CO2 mitigation is through CO2 capture and utilization. Today, CO2 capture from power plants is typically done using aqueous solutions of monoethanolamine (MEA). Disadvantages of this method include: high costs for regenerating the MEA solution after CO2 capture, solution degradation by flue gases like NOx and SOx, and equipment corrosion by the MEA solution. As a result, solid supported capture materials are currently being investigated as alternatives to aqueous MEA solutions for CO2 capture. We study the adsorption of MEA on TiO2 using synchrotron based UHV X-ray photoelectron spectroscopy (XPS) as well as Scanning Tunneling Microscopy (STM) and also its potential for CO2 capture with ambient-pressure XPS. Understanding the bonding of this simple CO2 capture molecules to a solid support on a molecular level can explain why this model system lacks the ability for CO2 capture.
After capturing the CO2 it can, for example, be used for dry-reforming of methane to form syn-gas – a mixture of H2 and CO – which can be used as a hydrogen source or for Fisher-Tropsch synthesis of fuels. In earlier studies it was shown, that reduced mixed MgO/NiO catalysts show better long-term stability for methane reforming than conventional Ni catalysts. In order to explore the favorable properties of these mixed-oxide catalysts we have taken a model catalyst approach: MgO plus NiO or CoO thin films were deposited onto Mo(100) and the intermixing of the oxides followed by their reduction was investigated with normal and grazing emission XPS and STM.
|Last modified:||22 October 2012 2.30 p.m.|