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 KAEWBUDDEE^1,2, PINIT KIDKHUNTHOD³, NARONG CHANLEK³, RATTABAL KHUNPHONOI^2,4,5 & KITIROTE WANTALA^1,2,5,6*

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

Diserahkan: 18 Disember 2018/Diterima: 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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*Pengarang untuk surat-menyurat; email: kitirote@kku.ac.th