Low temperature catalytic oxidation of aldehydes using wood fly ash and molecular oxygen

摘要: Abstract Aldehydes, such a 2-methylbutanal (2-MB) and 3-methylbutanal (3-MB), are odorous regulated VOCs generated in the poultry rendering process that ineffectively removed chemical wet scrubbers. It was theorized wood fly ash or selective crystalline phases could act to catalyze oxidation of aldehydes at room temperature presence ClO2, resulting low-cost/energy air pollution control method. Results indicate catalyzed (i.e., breakdown) 2-MB 3-MB both ClO2 with just O2 air) itself, potentially via free radical mechanism. Aldehyde did not occur measurable rates without activated carbon. The increase rate, but altered end products oxidation. Wood also air, leading appearance 2-butanone, compared acetone from 3-MB. Contact times 30 s reduced levels by ∼40% bench scale, batch reactors. Similar results were found using charcoal terms contact times), except higher molecular weight compounds appeared be formed. Continuous catalytic demonstrated fixed-bed reactor temperature; overall rate first order respect representative conversion 20% an inlet concentration 67 ppmv 2 s residence time (GHSV 1800 1/h, 25 °C, 1 atm) measured. potential inexpensive solid waste materials breakdown C5 emissions CO2, H2O, less odor offensive compounds, carbon balance on reaction complete identification required for implementation.