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Sains Malaysiana 46(2)(2017): 275–283
Gas phase Catalytic Oxidation of VOCS using Hydrothermally Synthesized Nest-like K-OMS 2 Catalyst (Fasa Gas Pengoksidaan Mangkinan VOCS menggunakan Hidroterma Sintesis seperti Sarang Pemangkin K-OMS 2) M.D. DE
LUNA1,. J.M. MILLANAR2., A. YODSA-NGA3
& K. WANTALA4* 1Department of Chemical Engineering,
University of the Philippines, 1101 Diliman,
Quezon City Philippines 2Environmental Engineering Graduate
Program, University of the Philippines, 1101 Diliman,
Quezon City, Philippines 3Chemical Kinetics and Applied Catalysis
Laboratory, Faculty of Engineering, Khon
Kaen University 40000 Khon
Kaen, Thailand 4Department of Chemical Engineering,
Faculty of Engineering, Khon Kaen University, 40000 Khon Kaen, Thailand 5Research Center for Environmental
and Hazardous Substance Management (EHSM), Faculty of Engineering,
Khon Kaen University, Khon Kaen 40002, Thailand Received: 12 November 2015/Accepted: 14
June 2016 ABSTRACT Toluene and benzene are hazardous
air pollutants commonly found in the atmosphere at relatively high
concentrations. Due to this, a need to remove these pollutants became
a necessity. In this study, octahedral molecular sieve type manganese
oxide (K-OMS
2) prepared by hydrothermal method was utilized to
decompose toluene and benzene. X-ray diffraction (XRD), scanning electron microscopy
(SEM), Brunauer-Emmet-Teller (BET), X-ray absorption near
edge structure (XANES) analysis were used to investigate the crystallinity,
morphology, surface area and oxidation state of K-OMS 2, respectively.
It was confirmed that K-OMS
2 was successfully produced from hydrothermal method.
Central composite design (CCD) was used to investigate the main
and interaction effects of gas hourly space velocity (GHSV)
and reaction temperature on the thermal catalytic oxidation of benzene
and toluene. Both factors were found to have significant main and
interaction effects on toluene oxidation. However, only the main
effects of the factors were significant for benzene. This result
was due to the difference in the stability of the structures of
the two VOCs. The K-OMS 2
obtained has excellent efficiency on toluene and benzene removal.
Toluene was completely decomposed at a temperature as low as 250°C
while benzene decomposition reached around 98% at 292.4°C. Keywords: Benzene; central
composite design; manganese oxide; octahedral molecular sieve; toluene ABSTRAK Toluena dan benzena
adalah pencemar udara merbahaya yang biasa ditemui di dalam atmosfera pada kepekatan yang agak tinggi. Oleh kerana ini, keperluan
untuk menyingkirkan
bahan cemar ini
menjadi suatu
keperluan. Dalam kajian ini, oktahedron ayak molekul jenis mangan
oksida (K-OMS 2) disediakan
melalui kaedah
hidroterma digunakan untuk menghuraikan toluena dan benzena.
Pembelauan sinar-x
(XRD),
mikroskop elektron
imbasan (SEM) dan
analisis Brunauer-Emmet-Teller
(BET)
digunakan untuk
mengkaji habluran, morfologi dan kawasan
permukaan seluas
K-OMS
2. Telah disahkan bahawa
K-OMS
2 berjaya dihasilkan
daripada kaedah
hidroterma. Pusat reka bentuk komposit
(CCD)
telah digunakan
untuk mengkaji kesan utama dan
interaksi halaju
ruang gas tiap jam (GHSV)
serta suhu tindak balas atas
pengoksidaan haba
mangkin toluena dan benzena. Kedua-dua faktor
didapati mendatangkan
kesan utama dan
interaksi yang ketara
pada toluena pengoksidaan.
Walau
bagaimanapun, hanya kesan utama faktor
adalah penting
bagi benzena. Keputusan ini adalah disebabkan
oleh perbezaan
dalam kestabilan struktur kedua-dua VOC.
K-OMS
2 yang diperoleh mempunyai
kecekapan cemerlang
ke atas penyingkiran
toluena dan
benzena. Toluena telah dihuraikan sepenuhnya pada suhu serendah 250°C manakala penguraian benzena mencapai tahap 98% pada 292.4°C. Kata kunci: Benzena;
mangan oksida;
pusat reka bentuk
komposit; oktahedron
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*Corresponding author; email: kitirote@kku.ac.th
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