Kraiwattanawong, Kriangsak

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Kraiwattanawong, Kriangsak
Alternative Name
Kraiwattanawong, K.
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Email
kriangsak.kr@kmitl.ac.th

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    Influence of solvent species used in solvent exchange for preparation of mesoporous carbon xerogels from resorcinol and formaldehyde via subcritical drying
    (2011-02-01)
    Kraiwattanawong, Kriangsak
    ;
    Tamon, Hajime
    ;
    Praserthdam, Piyasan
    Carbon cryogels are dried by 3 days of freeze drying with 6 h of pre-freezing whereas the carbon xerogels are prepared by 1 day of subcritical drying in the selective range of synthesis condition, but the mesoporosity of carbon xerogels are not well controlled. This research is to study the influence of solvent species in the solvent exchange for the preparation of carbon xerogels cooperated by the evaporation drying and the vacuum drying. The good solvent for the high mesoporous properties of carbon xerogels is desirable in the wide range of synthesis condition. The carbon xerogels prepared from resorcinol and formaldehyde were characterized by the nitrogen adsorption apparatus and the field emission scanning electron microscope (FE-SEM). The results illustrate that the mesoporous carbon xerogels in the two subcritical dryings can be easily prepared by solvent exchange. Among the solvents, t-butanol allows the great results in the preparation of high mesoporous carbon xerogels and is well applied in the wide range of synthesis conditions. The FE-SEM images elucidate that the carbon xerogels dried by the vacuum drying contain the particles interconnection larger than the evaporation drying. © 2010 Elsevier Inc. All rights reserved.
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    HCl treatment on micropore and mesopore structures of carbon cryogels from resorcinol and formaldehyde
    (2011-02-25)
    Kraiwattanawong, Kriangsak
    ;
    Tamon, Hajime
    ;
    Praserthdam, Piyasan
    The effect of HCl treatment on the porous properties of carbon cryogels synthesized from resorcinol and formaldehyde (RF) is investigated in this work. The treated and untreated carbon cryogels were analyzed with a nitrogen adsorption-desorption apparatus, scanning electron microscope (SEM) and high performance liquid chromatograph (HPLC). The results show that the HCl treatment can enlarge the micropore diameter which is advantageous to electric double layer capacitors, and can broaden the mesopore diameter, which is advantageous to mesoporous carbon supports of catalysts. The micropore volume, mesopore volume and weight loss of the carbon cryogel are not significantly changed by the HCl treatment. Moreover, SEM images and HPLC chromatograms support that the HCl treatment can promote the Ostwald ripening effect for RF carbon cryogels. © 2011 The Society of Chemical Engineers, Japan.
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    Some aspects about the nature of surface species on Pt-based and MFI-based catalysts for the selective catalytic reduction of NO by propene under lean-burn condition
    (2002-06-29)
    Praserthdam, Piyasan
    ;
    Chaisuk, Choowong
    ;
    Panit, Apiwat
    ;
    Kraiwattanawong, Kriangsak
    The nature of surface species for the selective catalytic reduction of NO by propene under lean-burn condition is relatively investigated on Pt/Al<inf>2</inf>O<inf>3</inf> and Co-ZSM-5 catalysts. An experimental set of three continuous steps including adsorption, temperature programmed desorption (TPD) and temperature programmed oxidation (TPO) is performed to observe the particular behavior of surface species on both catalysts. The surface species on Pt/Al<inf>2</inf>O<inf>3</inf> are almost totally released during TPD step, whereas those on Co-ZSM-5 are necessarily removed by the oxidizing gas on TPO step. It is suggested that the different nature of surface species on both catalysts should possibly play an important role on the reaction mechanism pathway. For Co-ZSM-5 catalyst, the surface species, which are formed by the interaction of NO, propene and oxygen, are distinctly assigned as the intermediate species in the NO reduction mechanism. On the other hand, for Pt/Al<inf>2</inf>O<inf>3</inf> catalyst, the observation of several surface species and the investigation about their reactivities indicate that several reaction mechanisms are simultaneously proceeded at the same operating condition. © 2002 Elsevier Science B.V. All rights reserved.