Sains Malaysiana 46(2)(2017): 275–283

http://dx.doi.org/10.17576/jsm-2017-4602-12

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

 

Diserahkan: 12 November 2015/Diterima: 14 Jun 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 ayak molekul; toluene

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*Pengarang untuk surat-menyurat; email: kitirote@kku.ac.th

 

 

 

 

 

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