(33d) CO2 Driven Chemical Looping Gasification on Doubly Doped Ceria

Climate change is one of the most talked about issues in today’s world. Scientists and researchers have been putting their best efforts to find an effective method to capture CO2 emitted by fossil fuels as a viable solution to this important matter. Chemical Lopping Combustion (CLC) is an advanced combustion system that facilitates the efficient capture of CO₂.[1] However, CLC does not propose a solution for CO2 utilization. Replacing air with CO2 in oxidation reaction, which is called “Chemical Looping Dry Combustion (CLDR)” has emerged as an interesting way to sequester the CO2. Reducing CO2 to CO in the oxidation reactor produces a useful and versatile gas, which can be the feed gas into many chemical processes. [2][3]

We propose to use a doubly doped ceria system that would have high oxygen capacity as well as high oxygen uptake and release rates in oxidizing and reducing atmospheres respectively. To aid in the increase in oxygen capacity as well as the oxygen release rates, we have doped ceria with zirconia. Additionally, to enhance the O₂ uptake, we have doped the zirconia doped ceria with iron while the same was doped with copper to facilitate the oxygen release in the fuel reactor. It should be noted that the level of doping allows the solids to maintain the cubic flurorite structure of Ce_O2 The results from these studies at different doping levels were then compared and an optimal oxygen carrier was designed, synthesized and evaluated. The results of these CLDR studies and the characterization of the materials will be presented.

References:

[1] Hossain, Mohammad M., and Hugo I. de Lasa. "Chemical-looping combustion (CLC) for inherent CO2 separations—a review." Chemical Engineering Science 63.18 (2008): 4433-4451.

[2] Song, C. S. Global challenges and strategies for control, conversion and utilization of CO2 for sustainable development involving energy, catalysis, adsorption and chemical processing. Catal. Today 2006, 115, 2-32. 17.

[3] Teuner, S. Make CO from CO2. Hydrocarb. Process. 1985, 64, 106-107.