424151 Multi B-Site Substituted La(Co1-X-YFeXMnY)O3 Perovskites for the Conversion of Carbon Dioxide to Carbon Monoxide By Thermochemical Cycles

Wednesday, November 11, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Yolanda A. Daza, Debtanu Maiti, Bryan J. Hare, Adela E. Ramos, Venkat R. Bhethanabotla and John N. Kuhn, Chemical & Biomedical Engineering, University of South Florida, Tampa, FL

The effect of transition metals interactions in the B site of a perovskite on the adsorption of CO2 and its conversion to CO were investigated. Four perovskites: LaCo0.33Fe0.33Mn0.33O3, LaCo0.50Fe0.25Mn0.25O3, LaCo0.25Fe0.50Mn0.25O3 andLaCo0.25Fe0.25Mn0.50O3 were synthesized by the Pechini method and characterized with X-ray diffraction and temperature-programmed reduction. Their oxygen vacancies formation capabilities were tested in an inert environment using mass spectrometry and thermogravimetric analysis (TGA). The influence of the different Co, Fe and Mn doping on carbon dioxide adsorption strength was also tested and a comparison was established with adsorption strength calculations from DFT. The conversion of CO2 to CO on the oxygen vacancies of the materials was also tested with TGA. The perovskite with higher conversion activities was studied in Thermochemical Cycles experiments, in which the perovskite is heated under inert until formation of oxygen vacancies. Then, it is cooled under CO2 while CO is formed.

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