Vol. 8 No. 1 (2009)

Common way has been done to reduce sulfur in fuels is by conventional techniques of hydro desulphurization (HDS), which needs high investment to reduce sulfur bounded as aromatic organosulphur. The alternative technologies of sulfur reduction is using a zeolite absorbent are promising due to ambient operating condition and simple technology. The experiment of sulfur reduction conducted by batch with temperatures around 25oC and contact time around 2 hours with stirring magnetic stirrer speed 100 RPM and addition some of weight zeolites into 100 mL of diesel fuels. Application of natural…

Indonesia is one of countries which is rich in zeolite deposits. Volcanic activities in this country millions years ago released much of volcanic tuff as source of zeolite materials. The most important of zeolite characteristics are high cation exchange capacity (CEC), capability to absorb ammonium ions, and their unique porous structures. Those characteristics can be used for many utilities of zeolite for agriculture such as soil ameliorant, slow release agent of nitrogen fertilizer, and growth media of horticultural plants. Application of zeolite as soil ameliorant gave good effect if…

Reaction kinetic of acetylation-cyclization (R)- (+)-citronellal with acetic acid anhydride which catalyzed Zn2+-zeolite (Zn2+-Za) was analyzed by Langmuir- Hinshelwood Models. (R)-(+)-citronellal isolated from lemongrass oil with fractionation distillation reduced pressure and analyzed anantiomer ratio with GC chiral column β- DEX 225. Catalyst preparation of Zn2+-Za conducted by acid activation on natural zeolite Malang 100 mesh using 1% HF and 6 M HCl, then soaked on 0,1 M NH4Cl. Calcination was done at 450oC during 1 hour with N2 flow to achieved H-natural zeolite (HZa). Cation exchange…

Zeolite synthesis from coal fly ash PLTU Tanjung Jati Japara was conducted by hydrothermal alkali. Preparation was done on fly-ash that has been refluxed with 1M of HCl and without refluxed. NaOH with certain concentration (2, 3, and 4M) was mixed with coal fly-ash by ratio 10 ml each 1 gram of fly ash into Teflon tube 100 ml at autoclave stainless-steel. Then, autoclave was heated on the oven at temperature of 120-1600C. Synthetic zeolite ouput was qualitative tested by using infrared spectroscopy, X-Ray diffraction, and SEM. The result showed that NaOH concentration, temperature, and…

Photocatalyst is reaction process of one materials to another materials which aided by energy from ultraviolet radiation and solid catalyst. The study conducted by making a catalyst based on variation concentrates from natural zeolite Cikalong-Tasikmalaya with addition of TiO2. The test of photocatalytic activity was conducted on methylene blue. The purpose this study to obtain a new photocatalytic is modified of natural zeolite with TiO2 which expected had a high reactivity so able to used on waste fluid processing. The step was conducted were activated natural zeolite, than making of…

Cs ions exchange process has been conducted on natural zeolite (from Bayah, Lampung, and Tasikmalaya) which was activated with ammonium chloride. NH4-zeolite which was formed, is used to exchanger or absorber material of Cs ions. The duration of ions exchange process was optimized by varying the stirring time of 1 hours, 2 hours, 3 hours, 4 hours, 5 hours, and 24 hours. In all three zeolite types was obtained the optimization process time are the contact time of 1 hours. Cation exchange capacity (CEC) of natural zeolite was determined by standard methods. Attempts to obtain a monocation…

Soils in Indonesia are mostly classified as Ultisol having physico-chemical properties such as low pH, low organic matter and very low in nutrients. As a result, the agricultural production on land is very low. Today the use of chemical fertilizers without addition of organic matter to cause a decline in soil organic matter content, soil physical properties become increasingly hard due to structural damage and no development of most soil microorganisms. In such conditions, the soil becomes no more responsive to fertilization so that agricultural production including food crops is leveling of.…