Sains Malaysiana 48(7)(2019): 1447–1457

http://dx.doi.org/10.17576/jsm-2019-4807-14

 

Chemical Surface Analysis on Post-Thermal Treatment of the K-OMS-2 Catalysts and Catalytic Oxidation Efficiency at Low Temperature

(Analisis Permukaan Kimia Rawatan Pasca Haba pada Mangkin K-OMS-2 dan Kecekapan Pemangkinan Pengoksidaan pada Suhu Rendah)

 

CHATKAMOL KAEWBUDDEE1,2, PINIT KIDKHUNTHOD3, NARONG CHANLEK3, RATTABAL KHUNPHONOI2,4,5 & KITIROTE WANTALA1,2,5,6*

 

1Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

 

2Chemical Kinetics and Applied Catalysis Laboratory (CKCL), Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

 

3Synchrotron Light Research Institute Public Organization, 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand

 

4Department of Environmental Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

 

5Research Center for Environmental and Hazardous Substance Management (EHSM), Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

 

6Research Program on Development of Appropriate Technologies for Coloring Agent Removal from, Textile Dyeing, Pulp & Paper, Sugar Industries for Sustainable Management, Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok 10330, Thailand

 

Received: 18 December 2018/Accepted: 24 April 2019

 

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.

 

Keywords: Oxidation state; thermal catalysis; toluene oxidation; VOCs removal; XPS

 

ABSTRAK

Kesan suhu pengkalsinan pada sifat fizikal dan kimia (K-OMS-2) kriptomelan telah dikaji. K-OMS-2 telah disintesis melalui kaedah hidroterma dan dikalsin pada suhu 200-600ºC. Aktiviti sampel pemangkin K-OMS-2 diuji dalam reaktor lapisan terpadat (PBR) pada pengoksidaan toluena. Sifat fizikal dan kimia telah dicirikan oleh teknik sinar-x difraktometer (XRD), mikroskop elektron imbasan (SEM), kawasan permukaan tertentu yang dihitung melalui persamaan Brunauer-Emmett-Teller (BET), spektroskopi transformasi Fourier inframerah (FTIR), spektroskopi fotoelektron sinar-x (XPS) dan ujian penyerapan sinar- x berhampiran pinggir struktur (XANES). Peningkatan suhu pengkalsinan daripada 200-600ºC membawa kepada perubahan daripada MnO2 kepada Mn2O3. Morfologi K-OMS-2 yang diperhatikan seperti jenis sarang dapat menggalakkan aktiviti pemangkinan. Dengan pertambahan suhu pengkalsinan, jumlah nisbah molar Oads/Olatt sedikit meningkat manakala getaran OH dianalisis FTIR meningkat secara tidak bererti. Perbandingan kesan interaksi menunjukkan bahawa nisbah molar Oads/Olatt memainkan peranan penting dalam prestasi pengoksidaan lebih daripada nisbah molar Mn3 +/Mn4 +.

 

Kata kunci: Keadaan pengoksidaan; pemangkin termal; pengoksidaan toluena; penyingkiran VOC; XPS

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*Corresponding author; email: kitirote@kku.ac.th

 

 

 

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