Total oxidation of lean propane over α-Fe2O3 using microwaves as an energy source

Abstract

A combined process of catalytic oxidation and microwave heating for the treatment of lean propane-air mixture, and ''green'' hematite synthesis were described in this work. The study demonstrated that removal and oxidation efficiencies of propane over a-Fe 2 O 3 were above 99.9 % after a short microwave radiation time (from 9 min) and they were strongly dependent on the applied microwave power. Comparing to conventional heating, the catalytic performance of hematite was enhanced by lowering the operation temperature under microwave conditions. Nanocrystalline a-Fe 2 O 3 catalyst with mesoporous structure was successfully prepared by a microwave-assisted hydrothermal treatment of iron hydroxide in an aqueous solution without any alkali additive, and characterized by XRD, TEM, TPR-H 2 , FTIR and N 2 adsorption-desorption. The microwave-induced heating over hematite catalyst appears to be a very effective alternative method for air treatment to the destruction and removal of short chain hydrocarbons.

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

“…Despite hematite has been used throughout the years as a catalyst for the oxidation of CO [151][152][153] (temperatures ranging from 225 to 350 • C) and the total oxidation of various VOCs such as methane [154] (high operating temperatures between 600 and 700 • C), propane [155,156] (complete combustion at 400 • C), and toluene [156] (complete combustion at 250 • C), only some of these analytes have been tested by hematite sensors. There are few or no studies concerning methane and propane, which could be investigated by taking advantage of the high-temperature stability of hematite.…”

Novel visible-light-driven Fe2O3/Ag3VO4composite with enhanced photocatalytic activity toward organic pollutants degradation

“…4a, the absorption peaks at 531 and 465 cm À1 in the low frequency region are the Fe-O-Fe stretching vibration band, suggesting that the synthesized sample is a-Fe 2 O 3 . [30][31][32][33] In the spectrum of pure Ag 3 VO 4 (Fig. 4b), three main absorption peaks at 918, 844, and 696 cm À1 can be clearly observed.…”