Masayoshi Fuji

Influence of hydrothermal and calcination process on metakaolin from natural clay

In this study, metakaolin was synthesized from natural clay from Lampang province via hydrothermal and calcination process. The hydrothermal process was studied at different temperature from 160 °C, 180 °C and 200 °C for 4, 8 and 12 hours. The calcination process was studied at different temperature from 500 to 900 °C for 2 hours. Regarding the characterization, physical morphology of resulting products was observed by scanning electron microscope showing that the surface of resulting product was enhanced its surface area with more roughness when the temperature was increased. Moreover, FT-IR spectroscopy was applied for the chemical structure analysis indicating that Lampang clay can be transformed into metakaolin using hydrothermal at 200 °C for 8 hours followed by the calcination at 800 °C and 900 °C as well as through the most condition for this studied. The improvement of the surface area of metakaolin leads to high metal dispersion for catalytic activity of the catalyst.In this study, metakaolin was synthesized from natural clay from Lampang province via hydrothermal and calcination process. The hydrothermal process was studied at different temperature from 160 °C, 180 °C and 200 °C for 4, 8 and 12 hours. The calcination process was studied at different temperature from 500 to 900 °C for 2 hours. Regarding the characterization, physical morphology of resulting products was observed by scanning electron microscope showing that the surface of resulting product was enhanced its surface area with more roughness when the temperature was increased. Moreover, FT-IR spectroscopy was applied for the chemical structure analysis indicating that Lampang clay can be transformed into metakaolin using hydrothermal at 200 °C for 8 hours followed by the calcination at 800 °C and 900 °C as well as through the most condition for this studied. The improvement of the surface area of metakaolin leads to high metal dispersion for catalytic activity of the catalyst.

Effects of hydrothermal temperature and time of hydrochar from Cattail leaves

Hydrochar have been successfully synthesized from Cattail leaves via hydrothermal carbonization. This research study the effect of hydrothermal temperature (160-200 °C) and reaction time (4-24u2005h) to develop porosity and surface area. The sample have been characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were employed to characterize morphology, surface function and disorder in carbon structure respectively. The results revealed that hydrothermal-carbonization process affect on the properties of hydrochar. The hydrothermal temperatures and time were increased resulted in the decomposition of hydrochar gradually increased amorphous carbon and aromatic groups on surface of hydrochar. Cattail leaves was hydrothermal carbonization at 200 °C for 12u2005h resulted in the most degradation of hemicellulose and cellulose.

Effects of transition metal during the hydrothermal carbonization on characteristics of carbon materials

Biomass from the agriculture wastes can be transformed to valuable carbon support through hydrothermal carbonization (HTC). In this study, the biomass was hydrothermally treated at 200 °C for 24u2005h in the presence of transition metals as catalysts. Various types of metal-salt solutions comprising of Cu(NO3)2, Cd(NO3)2, Fe(NO3)3, Ni(NO3)2 and Ba(NO3)2 with a concentration of 5 wt% during HTC, were investigated to study their effects on surface functional characteristics and morphological appearance of the synthesized carbons, which were subsequently characterized using FT-IR, and SEM analyses. Furthermore, the remaining metal particles on the synthesized carbon surface were found to be effective for catalytic applications. Thus, HTC of agriculture by-products in combination with the addition of transition metals would be an effective technique to prepare catalysts in a facile way.Biomass from the agriculture wastes can be transformed to valuable carbon support through hydrothermal carbonization (HTC). In this study, the biomass was hydrothermally treated at 200 °C for 24u2005h in the presence of transition metals as catalysts. Various types of metal-salt solutions comprising of Cu(NO3)2, Cd(NO3)2, Fe(NO3)3, Ni(NO3)2 and Ba(NO3)2 with a concentration of 5 wt% during HTC, were investigated to study their effects on surface functional characteristics and morphological appearance of the synthesized carbons, which were subsequently characterized using FT-IR, and SEM analyses. Furthermore, the remaining metal particles on the synthesized carbon surface were found to be effective for catalytic applications. Thus, HTC of agriculture by-products in combination with the addition of transition metals would be an effective technique to prepare catalysts in a facile way.

Zeolite P from kaolin via hydrothermal method

Zeolite P has been successfully synthesized from natural kaolin via two step hydrothermal process. The natural kaolin from Lampang, Thailand was studied for this research. In first hydrothermal, kaolin was mixed with sodium hydroxide solution at 200 oC for different reaction times from 3 – 5 hours, respectively .Sodium hydroxide and hydrochloric acid were added into the mixture to adjust their pH before they were formed into gel. Second hydrothermal process, the gel was kept of 90 oC for 3 days to obtain zeolite P. Synthesized zeolite P was characterized by X-ray diffraction (XRD) for identification the type and crystallization. Besides, the morphology was characterized by scanning electron microscopy )SEM.( The functional group was characterized by Fourier-transform infrared spectroscopy (FTIR). From this study, it was found that the increasing of reaction time in first hydrothermal activation and hydrochloric acid concentration lead to the high quality of zeolite P