Start
Dec 10, 2015 - 15:00
End
Dec 10, 2015 - 16:00
Venue
Room 240 Chemical Engineering
Event Type
Speaker
Dr. Saurabh Bhavsar Technology Development Engineer Technology Development Fabrication Facility Intel Corporation.
Title
REDUCIBLE OXIDE BASED OXYGEN CARRIERS FOR CHEMICAL LOOPING COMBUSTION AND PARTIAL OXIDATION OF METHANE
Abstract: Chemical looping combustion (CLC) is a novel combustion technology that offers a highly efficient route towards clean combustion of fuel with inherent CO2 capture. In CLC a fuel is combusted in reducer reactor in contact with an oxygen carrier (typically a metal oxide) and subsequently re-oxidized by air in oxidizer. Condensation of steam from reducer effluent results in high purity sequestration ready CO2 streams. Thus CLC results in a NOx-lean flame-less oxyfuel combustion process eliminating the need for air separation. Splitting the combustion into two half processes provides a high degree of flexibility in CLC for process intensification e.g. a wide range of oxygen carriers fuels and oxidant gases can be used albeit use of various fuels/oxidants have their own challenges. Typically in CLC a metal is supported on a high temperature stable matrix to provide the required thermal stability in harsh redox conditions. However these non-reducible supports do not contribute any oxygen in the combustion process or facilitate the reduction of supported metal. Therefore in the present work we test the applicability of reducible oxides like ceria as supports in CLC. It was found that compared to non-reducible supports the redox properties of ceria strongly facilitate efficient utilization of metal oxides in the process thus resulting in improved redox kinetics and higher carrier conversion. The broad applicability of the concept was tested with various transition metals typically used in CLC. Furthermore the reactivity of carriers was enhanced by employing systematically engineered mixed-oxides of iron nickel and/or manganese. Beyond combustion tailoring the metal phase and reactor operation was used for partial oxidation of methane to produce syngas – a valuable feedstock in chemical industry. Utilization of the looping concept for partial oxidation results in a safe oxidation process eliminating the need for expensive air separation or noble metal catalysts. Steam CO2 or mixtures of both can be used as oxidants for ultra-pure H2 or syngas generation and CO2 activation. Current work underscores the fact that reactor operation in chemical looping allows targeting clean combustion partial oxidation or various reforming processes but rational design of oxygen carriers makes these processes viable.About the Speaker: Saurabh completed his B. Chem. Eng. from U.D.C.T. Mumbai in 2009 and joined Prof. Götz Veser’s Catalytic Reaction Engineering Group at University of Pittsburgh USA. His Ph.D. research project focused on the development of an emerging clean combustion technology so-called “chemical looping combustion” as a broadly applicable and highly efficient technology for fuel processing applications an area which is at the heart of the energy resurgence in the United States due to the vastly expanded shale gas reserves. The project was conducted in collaboration with the U.S. Department of Energy’s National Energy Technology Laboratory. He is currently working at Intel Corporation in its Portland Technology Development fabrication facility at Hillsboro Oregon as a Technology Development Engineer to develop next generation microprocessors. At Intel he is part of a multi-disciplinary patterning team responsible for developing material processing operations like etching and understanding its impact on device yield.