Title of Article |
Chemical Surface Analysis on Post-Thermal Treatment of the K-OMS-2 Catalysts and Catalytic Oxidation Efficiency at Low Temperature |
Date of Acceptance |
24 April 2019 |
Journal |
Title of Journal |
Sains Malaysiana |
Standard |
SCOPUS |
Institute of Journal |
Faculty of Science and Technology Universiti Kebangsaan Malaysiaogy Universiti Kebangsaan Malaysia |
ISBN/ISSN |
|
Volume |
48 |
Issue |
7 |
Month |
๋July |
Year of Publication |
2019 |
Page |
1447-1457 |
Abstract |
The effect of calcination temperature on the physical and chemical properties of cryptomelane (K-OMS-2) was investigated. The K-OMS-2 was synthesized via a hydrothermal method and calcined at 200-600ºC. The catalytic activities of the K-OMS-2 samples were tested in packed bed reactor (PBR) on toluene oxidation. The physical and chemical properties were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), specific surface area computed by Brunauer-Emmett-Teller (BET) equation, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) techniques. The increasing of the calcination temperature from 200-600ºC led to transform the phases from MnO2 to Mn2O3. The morphology of K-OMS-2 which observed in a nest-like type could promote the catalytic activity. With increasing the calcination temperature, the amount of Oads/Olatt molar ratio slightly increased whereas OH vibrations analyzed by FTIR insignificantly increased. The comparison of interaction effect indicated that the Oads/Olatt molar ratio played an important role in the oxidation performance more than the Mn3+/Mn4+ molar ratio. |
Keyword |
oxidation state; thermal catalysis; toluene oxidation; VOCs removal; XPS |
Author |
|
Reviewing Status |
มีผู้ประเมินอิสระ |
Status |
ตีพิมพ์แล้ว |
Level of Publication |
นานาชาติ |
citation |
false |
Part of thesis |
true |
Attach file |
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Citation |
0
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