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Adsorption and Oxidative Desorption of Acetaldehyde over Mesoporous FexOyHz/Al2O3
journal contribution
posted on 2019-03-15, 00:00 authored by Jae Hwan Jeong, Soong Yeon Kim, Jeonghun Kim, Byeong Jun Cha, Sang Wook Han, Chan Heum Park, Tae Gyun Woo, Chul Sung Kim, Young Dok KimFexOyHz nanostructures
were incorporated into commercially
available and highly porous alumina using the temperature-regulated
chemical vapor deposition method with ferrocene as an Fe precursor
and subsequent annealing. All processes were conducted under ambient
pressure conditions without using any high-vacuum equipment. The entire
internal micro- and mesopores of the Al2O3 substrate
with a bead diameter of ∼2 mm were evenly decorated with FexOyHz nanoparticles. The FexOyHz/Al2O3 structures showed substantially high activity
for acetaldehyde oxidation. Most importantly, FexOyHz/Al2O3 with a high surface area (∼200
m2/g) and abundant mesopores was found to uptake a large
amount of acetaldehyde at room temperature, and subsequent thermal
regeneration of FexOyHz/Al2O3 in air resulted in the emission of CO2 with only a negligibly
small amount of acetaldehyde because FexOyHz nanoparticles
can catalyze total oxidation of adsorbed acetaldehyde during the thermal
treatment. Increase in the humidity of the atmosphere decreased the
amount of acetaldehyde adsorbed on the surface due to the competitive
adsorption of acetaldehyde and water molecules, although the adsorptive
removal of acetaldehyde and total oxidative regeneration were verified
under a broad range of humidity conditions (0–70%). Combinatory
use of room-temperature adsorption and catalytic oxidation of adsorbed
volatile organic compounds using FexOyHz/Al2O3 can be of potential application in indoor and outdoor
pollution treatments.
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Fe x O y H z nanoparticlesOxidative DesorptionFe precursorbead diameterwater moleculestemperature-regulated chemical vapor deposition methodadsorptive removalCO 2pollution treatmentsacetaldehyde oxidationambient pressure conditionshigh-vacuum equipmentAl 2 O 3 substrateoxidative regenerationroom temperatureroom-temperature adsorption
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