470935 Controllable Solution Combustion Synthesis of Nanoscale α/β-Bi2O3 and Its Catalytic Application

Thursday, November 17, 2016: 8:30 AM
Franciscan A (Hilton San Francisco Union Square)
Xiaohong Wang1, Yang Xiao2 and Arvind Varma2, (1)Chemical Engineering, Purdue University, West Lafayette, IN, (2)School of Chemical Engineering, Purdue University, West Lafayette, IN

Among the four different polymorphs of bismuth trioxide, α- and β- Bi2O3 show unique physical and chemical properties . In the present work, Bi2O3 nanoparticles of different phases (α and β) were selectively synthesized via simple, rapid and energy efficient solution combustion synthesis (SCS). Bismuth nitrate was used as the oxidizer, while tartaric acid, glycine, EDTA and sucrose were employed as fuels. By changing types of fuels, ratios of fuel/oxidizer and heating temperature, specific phases (α and β) of Bi2O3 were controlled and particle sizes (5-50 nm) of these materials were tailored. The formation mechanism was proposed by thermodynamic calculations. Stable α-Bi2O3 forms when the combustion temperature is higher than 350 °C while metastable β-Bi2O3 forms at temperature lower than 300 °C. Using the SCS products as catalytic supports, series of Pt/SCS-Bi2O3 catalysts were prepared and tested for glycerol oxidation. These results were compared to our prior studies of Pt-Bi catalysts placed on activated carbon and other supports.

Extended Abstract: File Not Uploaded