Articles

ANALISIS STRUKTUR MIKRO DAN STRUKTUR KRISTAL KARBON TEMPURUNG KELAPA DAN POLIVINIL ALKOHOL (PVA) PADA TEMPERATUR TINGGI Rampe, Meytij Jeanne; Setiaji, Bambang; Trisunaryanti, Wega; ., Triyono
CHEMISTRY PROGRESS Vol 7, No 2 (2014)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.7.2.2014.7470

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Have been done conducted by micro structure study and crystal structure of coconut shell of coconut carbon andof polivinil alcohol. This research studied using alcohol polivinil (PVA) as material for stimulating growth of carboncrystal structure. Method of pelarut and calsination, temperature sintering 1500 oC and time heating done byprocess technology. Method analyse SEM-EDS for the examination of micro structure and chemical compositionand also XRD for the examination of carbon product material crystal structure. Product characterized showparticle swampy forest which not yet uniform and structure of semi-kristalin.Telah dilakukan kajian struktur mikro dan struktur kristal dari karbon tempurung kelapa dan polivinil alcohol(PVA). Penelitian ini mempelajari penggunaan polivinil alkohol (PVA) sebagai bahan utnuk menstimulasipertumbuhan struktur kristal karbon. Metode pelarut dan kalsinasi, sintering temperatur 1500 oC dan lamapemanasan dilakukan pada teknologi proses. Metode analisis SEM-EDS untuk pengujian struktur mikro dankomposisi kimia serta XRD untuk pengujian struktur kristal material produk karbon. Karakter produk yangdihasilkan menunjukkan sebaran partikel yang belum seragam dan struktur semi-kristalin.
KINETICS STUDY ON NITRATION OF METHYL RICINOLEATE Abdullah, Abdullah; Triyono, Triyono; Trisunaryanti, Wega; Haryadi, Winarto
Indonesian Journal of Chemistry Vol 12, No 2 (2012)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21351

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Kinetics parameter values of methyl ricinoleate nitration (rate constant, reaction order and the rate of reaction) have been determined. Nitration was carried out with both concentrations of HNO3 and acetic anhydride in excess to the concentration of methyl ricinoleate. Thus, the kinetics parameter value was only affected by the concentration of methyl ricinoleate. Based on kinetic study conducted, it could be concluded that the nitration follows pseudo first-order, and the reaction rate for methyl ricinoleate with initial concentration of 0.375, 0.325 and 0.250 M were 3.736 x 10-5, 2.471 x 10-5, and 1.724 x 10-5 M/s respectively, with the rate constant at 28 °C was 6.667 x 10-4 (s-1). Based on evaluation of FTIR spectra could be estimated that the nitration produces compounds containing functional groups of -NO3 and -NO2.
PENGARUH PENGEMBANAN LOGAM Ni DAN Nb2O5 PADA KARAKTER KATALIS Ni/ZEOLIT DAN Ni/ZEOLIT-Nb2O5 Rodiansono, Rodiansono; Trisunaryanti, Wega; Triyono, Triyono
Jurnal Sains dan Terapan Kimia Vol 1, No 1 (2007)
Publisher : Jurnal Sains dan Terapan Kimia

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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
PENGARUH TEMPERATUR TERHADAP JUMLAH PRODUK HIDRORENGKAH FRAKSI ASPALTEN DARI ASPAL BUTON DENGAN KATALIS MO-NI/γ-ALUMINA Nuryanto, Rahmad; Trisunaryanti, Wega; Yahya, M. Utoro
Jurnal Kimia Sains dan Aplikasi Vol 12, No 1 (2009): Volume 12 Issue 1 Year 2009
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.589 KB) | DOI: 10.14710/jksa.12.1.14-16

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Hydrocracking process of Butonian asphalt derived asphaltene using Mo-Ni/?-alumina catalyst has been investigated. The processes were carried out in 1L stainless steel autoclave reactor. The reaction temperatures were 250, 300, 350 and 400?C, initial pressure was 10 atm and catalyst/feed ratio was 1/2. The asphaltene was a pentane insoluble-benzene soluble (PI-BS) fraction of Butonian asphalt.The results of hydrocracking processes showed the conversion by means of 100% - coke (wt %) was followed equation konversi % (w/w) = 0,306 t (?C) - 41,29Key words: hydrocracking, asphaltene, Mo-Ni/?-alumina catalyst
HIDRORENGKAH KATALITIK MINYAK KULIT BIJI JAMBU METE (CNSL) MENJADI FRAKSI BENSIN DAN DIESEL Efiyanti, Lisna; Trisunaryanti, Wega
Jurnal Penelitian Hasil Hutan Vol 32, No 1 (2014): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

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Penelitian ini bertujuan untuk mengetahui potensi hidrorengkah minyak kulit jambu mete menjadi fraksi energi dengan bantuan katalis. Katalis yang digunakan berbahan dasar Zeolit-Y yang berasal dari Jepang dan logam Nikel (E-Merck). Katalis NiO/ZY dipreparasi dengan metode impregnasi basah menggunakan garam prekursor Ni(NO3)2.6H2O kedalam zeolit-Y sebagai bahan pengemban. Karakterisasi katalis ditentukan dengan metode gravimetri untuk mengetahui keasaman katalis dengan basa piridin sebagai basa adsorbat dan porositas katalis menggunakan Surface Area Analyzer (NOVA- 1000). Proses hidrorengkah dilakukan dengan reaktor sistem fixed bed menggunakan katalis NiO/ZY pada suhu 400°C, aliran gas H2 sebanyak 20ml/menit selama 1 jam dengan rasio umpan/katalis = 4. Produk yang dihasilkan dianalisis menggunakan Kromatografi Gas (GC). Hasil reaksi yang diperoleh menunjukkan bahwa hidrorengkah CNSL dengan katalis NiO/ZY menghasilkan produk cair sebanyak 80,03% dengan selektivitas bensin, diesel dan minyak berat masing-masing sebesar 38,47%, 25,88% dan 15, 74%.
Liquid and Gaseous Fuel from Waste Plastics by Sequential Pyrolysis and Catalytic Reforming Processes over Indonesian Natural Zeolite Catalysts Syamsiro, Mochamad; Cheng, Shuo; Hu, Wu; Saptoadi, Harwin; Pratama, Nosal Nugroho; Trisunaryanti, Wega; Yoshikawa, Kunio
Waste Technology Vol 2, No 2 (2014)
Publisher : University of Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (462.88 KB) | DOI: 10.12777/wastech.2.2.44-51

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In this study, the performance of several differently treated natural zeolites in a sequential pyrolysis and catalytic reforming of plastic materials i.e. polypropylene (PP) and polystyrene (PS) were investigated. The experiments were carried out on two stage reactor using semi-batch system. The samples were degraded at 500°C in the pyrolysis reactor and then reformed at 450°C in the catalytic reformer. The results show that the mordenite-type natural zeolites could be used as efficient catalysts for the conversion of PP and PS into liquid and gaseous fuel. The treatment of natural zeolites in HCl solution showed an increase of the surface area and the Si/Al ratio while nickel impregnation increased the activity of catalyst. As a result, liquid product was reduced while gaseous product was increased. For PP, the fraction of gasoline (C5-C12) increased in the presence of catalysts. Natural zeolite catalysts could also be used to decrease the heavy oil fraction (>C20). The gaseous products were found that propene was dominated in all conditions. For PS, propane and propene were the main components of gases in the presence of nickel impregnated natural zeolite catalyst. Propene was dominated in pyrolysis over natural zeolite catalyst. The high quality of gaseous product can be used as a fuel either for driving gas engines or for dual-fuel diesel engine.
PENGARUH KARAKTER KEASAMAN TOTAL DAN PORI KATALIS ZEOLIT ALAM TERIMPREGNASI LOGAM TERHADAP PEMBENTUKAN FRAKSI BENSIN PADA REAKSI HIDRORENGKAH PLASTIK POLIPROPILENA Nurcahyo, I F; Trisunaryanti, Wega; Triyono, Triyono; Wahyuni, Endang Tri
Alchemy Jurnal Penelitian Kimia Vol 7, No 1 (2008)
Publisher : Alchemy Jurnal Penelitian Kimia

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Proses hidrorengkah fraksi berat hasil pirolisis plastik polipropilena (td 150-2500C) menjadi fraksi bensin menggunakan berbagai katalis dengan perbedaan keasaman dan karakter pori. Katalis – katalis yang digunakan yaitu zeolit alam (Z), Ni/Z, Pd/Z, NiPd/Z, dan NiPd/Z-Nb2O5. Reaksi dilakukan pada temperatur 4500C dengan perbandingan berat katalis : umpan sama dengan 1:2 menggunakan sistem air. Pada katalis dengan ukuran pori relatif besar, peningkatan keasaman total meningkatkan aktivitas katalis untuk reaktan senyawa hidrokarbon C>12. Pada katalis dengan ukuran pori yang relatif kecil peningkatan keasaman total bukan merupakan faktor penentu aktivitas katalis untuk senyawa hidrokarbon C>12 karena faktor sterik dari ukuran pori.
PREPARATION AND CHARACTERIZATION OF THE MONOMETAL CATALYST Mo/ USY Nugrahaningtyas, Khoirina Dwi; Trisunaryanti, Wega; Triyono, Triyono; Nuryono, Nuryono; Widjonarko, Dian Maruto; Mulyani, Mulyani
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
Publisher : Alchemy Jurnal Penelitian Kimia

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This research deals with preparing and characterizing the metal based-catalyst of Mo supported on Ultra Stable Y-zeolite (USY) and, is aimed to ascertain the best produced catalyst for hydrotreatment reaction in standpoint of its capabilities on removing the unwanted-heteroatom compounds.Procedure of catalyst treatment was preparation, activation and characterization. Monometal catalyst Mo/USY was prepared under variation concentrations of salt metal precursor (concentrations), i.e 2, 6, 10 and 14% wt. The activation steps were carried out by calcination, oxidation, and reduction. Characterization of catalysts were determined by data of XRD, AAS, acidity, surface area and its porosity. The result shows that these catalysts have several good characters that supporting their usefulness in hydrotreatment-catalytic reaction. In addition, catalyst Mo10/USY performs many ideal criteria as the best functional catalyst.
MODIFICATION OF TUREN BENTONITE WITH ALCL3 FOR ESTERIFICATION OF PALMITIC ACID Abdulloh, Abdulloh; Maryam, Siti; Aminah, Nanik Siti; Triyono, Triyono; Trisunaryanti, Wega; Mudasir, Mudasir; Prasetyoko, Didik
Bulletin of Chemical Reaction Engineering & Catalysis 2014: BCREC Volume 9 Issue 1 Year 2014 (SCOPUS Indexed, April 2014)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (728.293 KB) | DOI: 10.9767/bcrec.9.1.5513.66-73

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Natural Turen bentonite has been modified and applied as catalyst for palmitic acid esterification. Modification of natural Turen bentonite was conducted by cation exchange method using AlCl3 solution. Catalyst characterization was performed on X-ray Fluoroscence, X-ray Diffraction, nitrogen adsorption-desorption and infrared spectroscopy techniques. The catalytic activity test in the esterification reaction of palmitic acid with methanol was conducted by bath at 65 °C with a variation of reaction time of 1, 2, 3, 4 and 5 h. Catalytic activity has been observed qualitatively using GC-MS and quantitatively by changes in acid number. The analysis showed the formation of Al3+-bentonite. Observation on the elements has shown that the presence of calcium decreased from 10.2% to 4.17%, with an increase of aluminium content from 9.9% to 13%. Diffraction line at 2? 5.7379º became 5.6489º, along with changes in d-spacing of 15.3895 Å to 15.6319 Å. The surface area increased from 83.78 m2/g to 91.26 m2/g, while Brönsted acid sites increased from 10.2 µmol/g to 67.5 µmol/g and Lewis acid sites increased from 94.9 µmol/g to 132 µmol/g. Furthermore, Al3+-bentonite has showed as active catalyst in the esterification reaction of palmitic acid with palmitic acid with conversion of 78.78% for 5 h. © 2014 BCREC UNDIP. All rights reservedReceived: 24th September 2013; Revised: 31st December 2013; Accepted: 26th January 2014[How to Cite: Abdulloh, A., Maryam, S., Aminah, N.S., Triyono, T., Trisunaryanti, W., Mudasir, M., Prasetyoko, D. (2014). Modification of Turen?s Bentonite with AlCl3 for Esterification of Palmitic Acid. Bulletin of Chemical Reaction Engineering & Catalysis, 9 (1): 66-73. (doi:10.9767/bcrec.9.1.5513.66-73)][Permalink/DOI: http://dx.doi.org/10.9767/bcrec.9.1.5513.66-73]
Sifat Fisik dan Mekanik Cocofoam dari Serabut Kelapa dengan Kompon Lateks pada Beberapa Variasi Komposisi Campuran Anom, ID.K.; Setiaji, Bambang; Trisunaryanti, Wega; Triyono, Triyono
Agritech Vol 31, No 3 (2011)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (81.849 KB) | DOI: 10.22146/agritech.9752

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A research about cocofoam physical and mechanical properties of coconut fiber with latex compound in several varieties of composition mixture has been conducted. The purpose of the research is to analyze the influence of the cocofoam composition mixture change towards the physical and mechanical properties: specific density, cocofoam thickness after compression, tensile strength and elongation at break. The process of cocofoam making is done by mixing coconut fibers with latex compound, and then the mixture is molded, pressed, and vulcanized. The variety of composition weight from the mixture of coconut fiber with latex compound (w/w) is: 10/25 (CF5-1), 20/55 (CF5-2), 30/85 (CF5-3), 40/115 (CF5-4), and 50/145 (CF5-5) respectively. At constant volume, the cocofoam is molded with the thickness of 5 cm, and then the cocofoam is vulcanized in an oven of 80oC for 8 hours. From the statistical test result, it was discovered that the variety of coconut fiber composition mixture with latex compound in constant volume, has significant influence to the specific density, tensile strength, and elongation at break, while the compressed cocofoam does not show any significant difference to the change of the cocofoam thickness.ABSTRAKTelah dilakukan penelitian tentang sifat fisik dan mekanik cocofoam dari serabut kelapa dengan kompon lateks pada beberapa variasi komposisi campuran. Tujuan dari penelitian ini adalah untuk menganalisis pengaruh perubahan komposisi campuran bahan cocofoam terhadap sifat fisik dan mekanik yaitu: kerapatan massa, perubahan tebal cocofoam setelah kompresi, kekuatan tarik dan perpanjangan putus. Proses pembuatan cocofoam dilakukan dengan cara mencampurkan serabut kelapa dengan kompon lateks, kemudian campuran dicetak, dipres, dan divulkanisasi. Variasi komposisi berat campuran serabut kelapa dengan kompon lateks (b/b) berturut-turut adalah: 10/25 (CF5-1), 20/55 (CF5-2), 30/85 (CF5-3), 40/115 (CF5-4) dan 50/145 (CF5-5). Pada volume tetap masing-masing cocofoam dicetak dengan ketebalan 5 cm, dan selanjutnya cocofoam divulkanisasi dalam oven pada suhu 80oC selama 8 jam. Dari hasil uji statistik dapat diketahaui bahwa variasi komposisi campuran serabut kelapa dengan kompon lateks pada voleme tetap, berpengaruh secara signifikan terhadap kerapatan massa, kekuatan tarik dan perpanjangan putus, sedangkan cocofoam yang dikompresi ternyata tidak menunjukkan adanya perbedaan yang signifikan terhadap perubahan tebal masing-masing cocofoam.