Available Technology

Conversion of Carbon Dioxide to Carbon Monoxide or Synthesis Gas by Reforming or Gasification Using Oxygen Carriers/Catalysts

Research is active on the development of metal ferrite oxygen carriers/catalysts for use in processes that convert carbon dioxide (CO2) to carbon monoxide (CO) or synthesis gas by reforming or gasification. This invention is available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.
Patent Abstract: 
A variety of approaches have been employed to harness CO2activation in order to produce useful products for chemical processes and to control greenhouse gas emissions. These approaches includecatalytic dry reforming of methane, chemical looping dry reforming of fuel, and coal gasification with CO2. CO and synthesis gas are very useful precursors for various chemical processes and can be used as a fuel for energy production. In catalytic dry reforming, the production of syngas from CO2and methane is achieved in the presence of a catalyst that offers several advantages, such as mitigation of greenhouse gases emissions and conversion of CO2and methane into syngas which can be used to produce valuable downstream chemicals. In chemical looping dry reforming, oxygen from an oxygen carrier or metal oxide is used for partial combustion of methane or coal to produce syngas or CO. The reduced oxygen carrier is then oxidized using CO2to produce CO and oxidized oxygen carrier. In coal gasification with CO2, production of syngas from coal is achieved through the reaction of coal with CO2instead of air or steam, which can be enhanced by the presence of metal oxide/metal promoters. Since the gasification process does not require steam, significant cost reductions would be expected. However, finding low-cost and efficient catalysts/oxygen carriers for these processes has been a major challenge, limiting their commercial success.This invention describes the development and use of low-cost novel materials that have beendemonstrated to be efficient catalysts/oxygen carriers for the conversion of CO2to CO or synthesis gas by these processes. The use of these materials in commercial applications is expected to improve the efficiency of syngas production from methane or coal while reducing CO2emissions in an economically feasible way.
Complete conversion of methane and CO2to syngas was achieved at 800‒900 °C using these catalysts for catalytic dry reforming process, with stable performance for more than 12 hours of testing -Novel materials were efficient oxygen carriers for chemical looping dry reforming with CO2/fuel to produce CO achieving stable performance during multiple reduction and oxygen cycles at 800‒900 °C -Efficient CO2coal gasification was demonstrated using these materials to produce high yields of CO or syngas with high rates at relatively low temperatures (800-900 °C). -Novel oxygen carriers/catalysts can be produced using readily available materials at low cost -Oxygen carriers/catalysts are environmentally benign
Ranjani Siriwardane
Share to Facebook Share to Twitter Share to Google Plus Share to Linkedin