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All Journal Jurnal Teknoin Matematika dan Sains Communications in Science and Technology Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Scientific Contribution Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI
Wega Trisunaryanti
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Mathematics Mechanical Engineering

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PREPARASI PEMBUATAN COCOFOAM DARI SERABUT KELAPA I D. K. Anom, ; Bambang Setiaji, ; Wega Trisunaryanti, ; Triyono,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

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Abstract

A preliminary study had been conducted on the making of cocofoam from coco fiber using diluted latex-water mixture. Coco fiber was cleaned and washed, and then dried up in the sun. Then, coco fiber was mixed with diluted latex-water mixture in several weight variations (w/w) 5:3, 5:4, 5:5, 5:6, 5:7 and 5:8. The mixture of coco fiber with the diluted latex-water was molded, and the result was called cocofoam. Cocofoam was vulcanized by using steam with duration variation 30, 60 and 90 minutes. After vulcanization cocofoam was dried up in room temperature for 36 hours. Then, the elasticity test was carried out by giving loads on its surface with weight variation 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 kg. The result showed that the best quality cocofoam was produced from coco fiber blended with diluted latex-water mixture 5:6. In direct observation, this result didn’t show latex clod on cocofoam product, and the elasticity value was quite good. The C-56 cocofoam vulcanization steamed for 90 minutes showed increasing thickness about 22%, elasticity test showed the decreasing thickness for 2,04% in average, and the C-56 cocofoam density is 0,7905 g/cm3.3.
PREPARASI, MODIFIKASI DAN KARAKTERISASI KATALIS NI-MO/ZEOLIT ALAM DAN MO-NI/ZEOLIT ALAM Wega Trisunaryanti; Endang Triwahyuni; Sri Sudiono
Teknoin Vol. 10 No. 4 (2005)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v10i4.105

Abstract

Preparations and modifications of Ni-Mo/natural zeolite and Mo-Ni/natural zeolite catalysts as well as their characterizations had been carried out. The preparations of catalysts were carried out by reacting a natural zeolite produced in Wonosari with the precursor of Ni(NO3)2.9H2O and Mo(NH4)7.6H2O. The modifications were performed by varying the rasio of Ni/Mo whereas the Mo was previously loaded to the zeolite or Mo/Ni ratio whereas the Ni was previously loaded and the total metal content was 1 wt.% based on the zeolite. The aim of this research for the fututure is to prepare catalysts with high acidity and crystallinity for the conversion of waste plastics fraction to gasoline fraction (C5-C12 hydrocarbons).    The characterization of catalysts included determination of metal content using Atomic Adsorption Analysis (AAS), acidity by adsorption of ammonia or pyridine vapour  base method, and crystallinity by X-ray Diffraction (XRD). The treatment of catalysts using Etilene Diamine Tetra Acetic acid  (EDTA) was performed to study the metal distribution on the outer or inner surface of the zeolite.    The characterization results showed that the loading of Ni and Mo to the zeolite produced higher acidity catalysts than those of monometal loaded catalysts. The increase of Ni loaded caused the decrease of catalysts acidity, on the other hand, the increase of Mo loaded caused the increase of catalysts acidity. The metals loaded on the zeolite were distributed inside the pore and at outer surface of the zeolite. For all catalyst samples, the acidities determined using ammonia were higher than those of pyridine, and the acidities determined before the EDTA treatment was lower than those after the treatment.  The metals loading on the zeolite did not defect its crystallnity. Metal contents of the zeolite before the EDTA treatment were higher than those after the treatment. The relationship between the metal ratios towards the catalyst acidity was varying. The EDTA treatment to the zeolite sample enhanced the crystallinity of the sampel. Catalyst samples produced in this research have high acidities and crystallinities, thus promisingly can be used for conversion process of waste plastics to gasoline fraction.  Keywords : natural zeolite, acidity, Ni-Mo/natural zeolite, Mo-Ni/natural zeolite, crystallinity, EDTA
PENGARUH PENGEMBANAN LOGAM Ni DAN Nb2O5 PADA KARAKTER KATALIS Ni/ZEOLIT DAN Ni/ZEOLIT-Nb2O5 Rodiansono Rodiansono; Wega Trisunaryanti; Triyono Triyono
Jurnal Sains dan Terapan Kimia Vol 1, No 1 (2007)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (248.187 KB) | DOI: 10.20527/jstk.v1i1.2002

Abstract

Telah dilakukan preparasi dan karakterisasi katalis Ni/zeolit dan Ni/zeolit-Nb2O5 untuk mempelajari pengaruh pengembanan logam Ni dan Nb2O5. Katalis dibuat dengan metode impregnasi, dilanjutkan kalsinasi pada temperatur 500oC, oksidasi dan reduksi pada temperatur 400oC, masing-masing dengan aliran gas nitrogen, oksigen dan hidrogen. Karakterisasi katalis meliputi penentuan luas permukaan spesifk, rerata jejari pori dan volume total pori menggunakan metode BET, penentuan jumlah situs asam total menggunakan metode gravimetri dan kekuatan situs asam menggunakan sepektroskopi infra merah (IR). Hasil karakterisasi menunjukkan bahwa luas permukaan spesifik turun, rerata jejari pori dan volume total pori meningkat setelah pengembanan logam Ni dan Nb2O5 dibandingkan dengan zeolit. Jumlah situs asam masing-masing katalis meningkat dibanding zeolit setelah pengembanan logam Ni dan Nb2O5. Keywords: nikel,niobium oksida, katalis 
Study of green and sustainable heterogeneous catalyst produced from Javanese Moringa oleifera leaf ash for the transesterification of Calophyllum inophyllum seed oil Ramdhani, Destania Ayu; Wega Trisunaryanti; Triyono
Communications in Science and Technology Vol 8 No 2 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.2.2023.1202

Abstract

The transesterification of Calophyllum inophyllum seed oil into biodiesel using Javanese Moringa oleifera leaf ash catalyst with various reaction conditions has been completed. MA-500 (Moringa ash at 500°C for 3 h) and MA-900 (Moringa ash at 900°C for 3 h) catalysts were obtained by grinding Javanese old Moringa oleifera leaf (MP) and then calcined for 3 h at 500 and 900°C. The crude Calophyllum inophyllum seed oil was degummed (OD) prior to continue the esterification process (ODE). The MA-500 and MA-900 catalysts were tested for their activity and selectivity through the ODE transesterification with various catalyst weights (3, 6, and 9% (w/w)), reaction temperature (55, 60, and 65°C), oil: methanol mole ratio (1:3, 1:6, and 1:9), and reaction time (60, 90, 120, and 150 minutes). The results showed that the MA-500 and MA-900 catalysts contained 18.17% and 52.91% Ca respectively. The esterification reaction could reduce FFA levels to 89.82%, from 19.46% to 1.98%. ODE transesterification with MA-900 catalyst optimum reaction conditions with a catalyst weight of 3%, reaction temperature of 60°C, oil: methanol mole ratio of 1:9, and reaction time of 120 min, 76.17% FAME yield was observed. The MA-900 catalyst has the potential to be an effective green catalyst.
Calculation Of Nitrogen Heat Adsorption On Various Catalysts Usingbet-Constant (Bet-0 Data) Triyono; Wega Trisunaryanti; Oberlin Sidjabat
Scientific Contributions Oil and Gas Vol. 31 No. 3 (2008): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

BET-C (Brunauer-Emmett-Teller-Constant) was used to calculate the heat of adsorp-tion (AHaijj of nitrogen gas on the various catalysts. The -well-known Brunauer-Emmett-Teller (B.E.T.) equation is usedprimarily to determine the surface area from the physicaladsorption of a gas on a solid surface. Surface area of catalysts -was determined by usingsurface area analyzer (NOVA 1000). The BET-C included in the data is usually neglected or is not taken into accoimt. How-evei; by using the basic principles of the adsorption theory fitted ivith the functions basedon the BET adsorption model, the iniportant data of BET-C can be shoivn in this study. Thevalue of the AHa(h (NJ for zeolite, H-zeolite, Pt/zeolite, Pt-Pd/zeolite, and Pt-Ce/zeolitecalculatedfrom the equation derivedfrom BET-C are -6.43, -6.52, -8.78, -8.69, -9.71 and-9.52 kJ/mol, respectively.
Pembuatan Biodiesel sebagai Bahan Bakar Alternatif: Transesterifikasi Minyak Kelapa dengan Metanol Menggunakan Katalis NaOH Wega Trisunaryanti; Chairil Anwar
Lembaran Publikasi Minyak dan Gas Bumi Vol. 38 No. 3 (2004): LPMGB
Publisher : BBPMGB LEMIGAS

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Abstract

Peningkatan volume konsumsi dan terbatasnya ketersediaan minyak diesel mendorong upaya pencarian sumber energi baru sebagai bahan bakar diesel alternatif. Minyak nabati merupakan bahan baku yang sangat potensial sebagai sumber energi. Pada umumnya, minyak nabati memiliki nilai pembakaran yang mirip dengan bahan bakar diesel, akan tetapi pemanfaatannya secara langsung dibatasi oleh viskositasnya yang terlalu tinggi. Secara umum, biodiesel dapat diekstrak dari berbagai produk pertanian, misalnya minyak kelapa. Indonesia, sebagai negara tropis, merupakan negara yang sangat efektif dan potensial sebagai penghasil kelapa. Tanaman kelapa (Cocos nucifera) merupakan tanaman perkebunan yang utama dan terluas di Indonesia. Pada penelitian ini akan dibuat biodiesel dengan kualitas tinggi melalui transesterifikasi minyak kelapa dengan metanol menggunakan katalis NaOH serta ditentukan karakter fisis dan komposisi kimiawinya, dikaji pengaruh temperatur dan konsentrasi katalis NaOH terhadap konversi (% b/b), karakter fisis serta komposisi kimiawi biodiesel yang dihasilkan. Terakhir, ditentukan kondisi reaksi optimum pembuatan biodiesel.
Co-Authors Bambang Setiaji Chairil Anwar Endang Triwahyuni I D. K. Anom Oberlin Sidjabat Ramdhani, Destania Ayu Rodiansono Rodiansono Sri Sudiono Triyono Triyono Triyono