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RISS 인기검색어
- 검색키워드
- 저자 : Arthit Neramittagapong (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Suppression of CO on methanol decomposition over SnO2 catalysts
Arthit Neramittagapong,Sutasinee Neramittagapong,Nurak Grisdanurak 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.4
Methanol conversion was studied in the temperature range 350–400 8C at atmospheric pressure over a SnO2 catalyst. The results show SnO2 catalyzed methanol conversion to form methane, carbon dioxide and hydrogen selectively. This suggests that formaldehyde was an intermediate in producing methyl formate, which readily decomposed into methane and carbon dioxide. Both activity and selectivity were found to be independent on the specific surface area. The deactivation of the catalyst at high temperature was attributed to the decrease of surface area by formation of metallic tin.
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Mordenite modification and utilization as supports for iron catalyst in phenol hydroxylation
Sittichai Kulawong,Jatuporn Wittayakun,Sanchai Prayoonpokarach,Arthit Neramittagapong 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2
The goal of this work was to synthesize mordenite in sodium form (NaMOR) using rice husk silica;modify by leaching with acid, base or both; and use the obtained zeolites as supports for iron (Fe)catalysts in phenol hydroxylation. All MOR zeolites were characterized by X-ray diffraction (XRD),nitrogen adsorption/desorption and the Si/Al ratios were determined by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The influence of zeolite modification to the phenol hydroxylation was also studied. All modified zeolites still exhibited MOR phase with higher surface area than that of the parent NaMOR. Only the sample leached by acid and base (ABMOR) showed a significant change in adsorption–desorption isotherm from type I to type IV, a characteristic of mesoporousmaterials. The major forms of Fe (5 wt.%) in all catalysts confirmed by XRD and X-ray Absorption Near Edge Structure (XANES) were Fe2O3. Because mesopores were generated in ABMOR to facilitate diffusion of reactants, the fastest reaction was obtained on Fe/ABMOR catalyst. The conversion was also highest on this catalyst probably because Fe was dispersed on the support with the highest surface area. However, the presence of mesopores did not improve the selectivity and the products observed were catechol and hydroquinone.
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