Browsing by Author "Tursiloadi, Silvester"

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    Preparation Of Sulfated Titania Aerogel For Glicerol Mono Oleate Syntesis Compared To Zeolite
    (2015-09-28) Tursiloadi, Silvester; Savitri
    Sulfated titania (TiO2-SO42-) aerogel has been prepared through one-step synthesis by the sol-gel method using sulfuric acid as catalyst followed by the one-step CO2 supercritical extraction. Highly porous aerogel with a large surface area (469m2/g) and high porosity (pore volume 1.6cm3/g) has been obtained. Thermal evolution of the gels were evaluated by TGA-DTA, N2 adsorption, TEM and XRD, and the IR absorption spectra measurements were made to discuss the structure of sulfated titania. The anatase phase is stable after calcination at temperatures up to 700oC, and the specific surface area, total pore volume and average pore diameter of anatase phase do not change significantly after calcination at 600oC. Thermally stable and highly acidic sulfated titania aerogel is attractive as catalyst. The catalytic activity of the sulfated anatase shows better ability than Zeolite for application as a catalyst for etherification reaction of oleic acid (C18H34O2) with glycerol (C3H8O3) to produce glycerol mono oleate.
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    STUDI PENGARUH PELARUT PADA SINTESIS MAGNESIUM OKSIDA DENGAN METODE KOPRESIPITASI SEBAGAI KATALIS BASA PADAT
    (2020-06) Lintang, Hendika Putra; Awaluddin, Amir; Tursiloadi, Silvester
    Magnesium oxide is a base metal oxide which has catalytic activity in triglyceride transesterification reaction, Michael's addition and Knoevenagel condensation. Coprecipitation is a synthesis method of inorganic compounds with simple process and produces the small and uniform particle sizes by high surface area. In this study, magnesium oxide was synthesized by reacting MgCl2.6H2O and KOH various solvents that are aquades, methanol, ethanol and butanol under reflux. The product was calcined at 450 oC during 4 hours and characterized by TGA-DSC, FTIR, XRD, SAA and TPD. Thermal analysis by TGA-DSC and FTIR, and x-ray diffractogram showed crystalline MgO was formed at calcination temperature of 450 oC. Surface area analysis and surface basicity analysis showed the MgO/ButOH has highest surface area of 156.4962 m2/g and highest surface basicity of 2.18 mmol/g.