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Pemanfaatan Limbah Pecahan Genteng sebagai Katalis dalam Reaksi Pirolisis Plastik Polipropilena Menjadi Bahan Bakar Alternatif Syahputra, Rahmat Jaya Eka; Utami, Tri; Nugrahaningtyas, Khoirina Dwi; Ridasepri, Arikasuci Fitonnah; Astuti, Widy
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 3 (2015): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.651 KB) | DOI: 10.23955/rkl.v10i3.3067

Abstract

Artikel ini mendiskusikan karakterisasi pecahan genteng dan pemanfaatannya untuk memproduksi katalis. Tujuan penelitian ini adalah untuk mengetahui karakteristik pecahan genteng dan kemudian melakukan modifikasi untuk pembuatan katalis. Katalis dibuat dengan pilarisasi nikel ke dalam pecahan genteng, dan dikarakterisasi menggunakan x-ray diffractometer (XRD). Pirolisis dilakukan terhadap limbah plastik polipropilena hingga diperoleh cairan minyak. Minyak direforming menggunakan katalis pecahan genteng terpilarisasi nikel. Hasil karakterisasi menunjukkan bahwa pecahan genteng mempunyai kandungan logam oksida berdasarkan standar Fe2O3, NiO2, Al2O3, SiO2. Refinement dilakukan menggunakan program Rietica metode Le-Bail dan diperoleh hasil nilai keberterimaan Rp/Rwp <10. Setiap 1,3 kg sampel limbah polipropilena diperoleh hasil minyak sebanyak 1,7 L. Hasil reforming menunjukkan bahwa densitas minyak sebesar 745,919 kg/m3 dan viskositas 0,720 cp. Berdasarkan analisis GC-MS diperoleh fraksi pembentukan terbesar dari katalis pecahan genteng terpilarisasi nikel adalah fraksi C10 - C12. Sehingga, pecahan genteng yang terpilarisasi nikel efektif dijadikan sebagai katalisator dalam proses pirolisis untuk mengubah limbah palstik polipropilena menjadi bahan bakar.
CATALYTIC ACTIVITY CoMo/USY ON DEOXYGENATION REACTION OF 4-METHOXYPHENOL IN BATCH REACTOR Nugrahaningtyas, Khoirina Dwi; Putri, Irma Fadhila; Heraldy, Eddy
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 1 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.1.2378.66-74

Abstract

This research was conducted to study the effect of catalyst type of CoMo/USY and the reaction time on the deoxygenation reaction of 4-methoxyphenol. The catalyst type used were CoMo/USY, Co-Mo/USY, and Mo-Co/USY. The product was analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The activity of the Co-Mo/USY catalyst is higher than CoMo/USY and Mo-Co/USY, it can be seen from the value of total yield and the selectivity. The Co-Mo/USY catalysts shows a significant increasing on the total yield percentage (from 3.71 % to 9.41 %) during catalytic testing. The Co-Mo/USY catalyst has a highest selectivity toward 1,4-dimethoxybenzene product when the reaction time was one hour (0.92 %) and selectivity toward 1,4-dihidroxybenzene when reaction time two hours (0.43 %).
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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Abstract

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.
EFFECT OF CONCENTRATION METAL PRECURSOR Co AND Mo ON CHARACTER OF CoMo / USY CATALYST Nugrahaningtyas, Khoirina Dwi; Hidayat, Yuniawan; Saputri, Tiara Diah
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

The preparation and characterization of bimetallic catalysts using impregnation method with a variation of concentration of precursor sequence Co and Mo metal  obtained  catalyst K 1 [Co (0.018 M) - Mo (0.037 M)/USY]. K 2 [Co (0.026 M) - Mo (0.055 M)/USY], K 3 [Co (0.035 M) - Mo (0.074 M)/USY], K 4 [Co (0.05 M) - Mo (0.11 M )/USY] and K 5 [Co (0.107 M) - Mo (0.22 M)/USY].Character of the catalyst in terms  of crystallinity was analyzed by XRD. The result shows that there is no cristalinity damage of USY after impregnation but the amorphous cristalin structure was obtained.  Amount of metal content was analyzed by XRF and the catalyst morphology by SEM-EDS. The result shows that the higher the concentration of Co and Mo so that find the higher content of metal in catalyst of the prepared catalyst increase. K 4 shows the best characteristic of catalysts prepared in this research. Analysis of K 4 is proving that Co and Mo are presented in catalyst
OPTIMASI pH DAN WAKTU KONTAK BIOSORPSI ZAT WARNA REMAZOL YELLOW OLEH BIOMASSA Rhyzopus oryzae AKTIF DAN TERIMMOBILISASI Kusumaningsih, Triana; Nugrahaningtyas, Khoirina Dwi; Rahmayanti, Prima Vinka
Alchemy Jurnal Penelitian Kimia Vol 6, No 2 (2007)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Telah dilakukan optimasi pH dan waktu kontak biosorpsi zat warna remazol yellow oleh biomassa rhyzopus oryzaeaktif dan terimmobilisasi. Biomassa Rhyzopus oryzae ditumbuhkan pada media cair Yeast Ekstrak Pepton Dekstrosa (YEPD). Biomassa diaktivasi dengan cara diberi NaOH 1 M, dipanaskan pada 121oC selama 15 menit lalu dikeringkan pada suhu 70oC selama 12 jam. Proses immobilisasi biomassa dilakukan dengan cara dicampur pada gel natrium silikat, kemudian dipanaskan pada suhu 60oC selama 12 jam. Zat warna Remazol Yellow diserap dari larutannya dengan variasi pH 7 – 13 dan variasi waktu kontak 10 – 100 menit. Konsentrasi zat warna Remazol Yellow yang diserap dianalisis dengan spektrofotometer Ultraviolet-Visibel (UV-VIS) sebagai selisih dari konsentrasi awal dan konsentrasi terukur. Hasil penelitian menunjukkan bahwa daya serap biomassa aktif sebesar 2,623 mg/g pada kondisi pH 10- 11 dan waktu kontak optimum 30 menit, sedangkan daya serap biomassa terimmobilisasi sebesar 3,775 mg/g pada kondisi pH optimum 11 menit dan waktu kontak optimum 20 menit.
AKTIVITAS DAN SELEKTIVITAS KATALIS Mo-Co/USY PADA REAKSI HIDRODEOKSIGENASI ANISOL Nugrahaningtyas, Khoirina Dwi; Hidayat, Yuniawan; Prayekti, Prima Susan
Jurnal Penelitian Saintek Vol 20, No 1 (2015): April 2015
Publisher : Jurnal Penelitian Saintek

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh katalis Mo-Co/USY terhadap distribusi dan konversi produk serta pengaruh penambahan logam Co terhadap selektivitas produk benzena pada reaksi hidrodeoksigenasi (HDO) anisol. Reaksi HDO anisol dilakukan dengan sistem alir. Produk yang terbentuk dianalisis dengan kromatografi gas-spektrometer massa GC-MS. Produk utama dari HDO anisol yaitu benzena dan toluene. Aktivitas katalis Mo- Co/USY lebih tinggi daripada USY dan termal. Katalis Mo-Co/USY B memiliki selektivitas tertinggi pada produk benzena (15%).Kata kunci: aktivitas katalis, hidrodeoksigenasi, katalis Mo-Co/USY, reaksi hidrodeoksi- genasi anisol
KAJIAN AKTIVASI H2SO4 TERHADAP PROSES PEMILARAN Al2O3 PADA LEMPUNG ALAM Nugrahaningtyas, Khoirina Dwi; Widjonarko, Dian Maruto; Daryani, Daryani; Haryanti, Yunita
ALCHEMY Jurnal Penelitian Kimia Vol 12, No 2 (2016): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.12.2.1312.190-203

Abstract

Telah dilakukan penelitian tentang lempung alam (bentonit) yang diaktivasi dengan berbagai variasi konsentrasi H2SO4, dan dengan proses interkalasi menggunakan larutan Al2O3.H2O. Tujuan dari penelitian ini adalah untuk menentukan konsentrasi optimum untuk aktivasi lempung, berdasarkan karakter persentase montmorillonite dan keasaman total. Hal ini juga didukung oleh karakterisasi setelah proses interkalasi, yaitu karakter luas permukaan spesifik, volume pori total, radius pori rata-rata dan kandungan aluminium. Analisis persentase-Montmorilonit dilakukan dengan menggunakan difraksi sinar X; keasaman total ditentukan secara gravimetri; luas permukaan spesifik, volume pori total, dan jari-jari pori rata-rata diukur dengan Surface Area Analyzer NOVA dan kandungan aluminium ditentukan oleh Analisis Aktivasi Neutron.Hasil penelitian menunjukkan bahwa aktivasi optimum pada konsentrasi H2SO4 1,5 M mempunyai persentase montmorillonite optimum (91.335%) dan nilai keasaman meningkat 193.955% dari nilai keasaman bentonit alam. Karakter fisik dan kimia setelah interkalasi juga menunjukkan bahwa terjadi peningkatan kadar aluminium (57,540%), luas permukaan spesifik (150,586%), volume total pori (73,236%) dan keasaman Total (203,504%) dari bentonit alam. Rerata jejari pori mengalami penurunan 10,274% setelah aktivasi dan penurunan 30,868% setelah proses interkalasi.
CALCINATION ON Ca-Mg-Al HYDROTALCITE FROM BRINE WATER AND ITS CHARACTERIZATION Heraldy, Eddy; Nugrahaningtyas, Khoirina Dwi; Heriyanto, Heriyanto
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.2.5606.205-216

Abstract

The study of calcination at 450 ºC on Ca-Mg-Al-hydrotalcite synthesized from brine water has been investigated. Characterization by XRD shows that Ca-Mg-Al hydrotalcite compound has found hydrotalcite phase and another phase such as Mg(OH)2, Al(OH)3 and CaCO3. These results are confirmed by the presence of hydroxyl groups (-O-H), M-O and M-OH groups (M is Mg, Ca and Al) at wavenumber region around     3463,34 cm-1; 447,50 cm-1; 536,62 cm-1and 786,99 cm-1. The calcination on Ca-Mg-Al hydrotalcite at 450 ºC affected change in the structure become a metal oxide such as MgO, CaO, Al2O3, MgAl2O4, and CaCO3. These results are confirmed from decreasing on the absorption peak of M-OH group at wavenumbers around 536,62 cm-1and 786,99 cm-1 and widening of the absorption region at 447,5 - 857,4 cm-1. Consequently, the calcination treatment successfully increased the surface area of Ca-Mg-Al hydrotalcite compounds from 97.4 m2/g to 156.826 m2/g. Morphology of Ca-Mg-Al hydrotalcite underwent changes the shape from a big to be a small form. Thermal analysis results showed changes in the structure of Ca-Mg-Al hydrotalcite into oxides begin at a temperature of 210 ºC and become oxide completely after the temperature reaches 420 ºC.
REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE Istiqomah, Ana Ulfa; Rahmawati, Fitria; Nugrahaningtyas, Khoirina Dwi
ALCHEMY Jurnal Penelitian Kimia Vol 12, No 2 (2016): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.12.2.1876.179-189

Abstract

Soda ash (NaOH) has been used in bioethanol production in the second step destillation to increase the purity up to 90%. The destillation process will produce waste water with a high sodium content. The soda ash itself serve as an electrolyte to modify the colligative properties of the water-ethanol mixture allowing the disappearance of azeotropic point. This research aims to study the replacement of NaOH with KOH, in which the kalium is a nutrient to maintain soil fertility. This research study the thermodynamics properties, vapor-liquid equilibrium, colligative properties and also its azeotropic point in the destillation of water-ethanol mixture when KOH and NaOH were used as the additive. A model of water-ethanol mixture at a various composition of 0-100 weight % of ethanol was used. The electrolyte addition was 0.1 mol electrolyte/total weight of ethanol-water. The result shows that the addition of electrolyte into ethanol-water mixture eliminate the azeotropic point and allows the ethanol molecules to separate from water. The enthalpy of mixing between water-ethanol is 239.601 kJ/mol. It becomes 259.796 kJ/mol and 264.793 kJ/mol after the addition of NaOH and KOH, respectively. It confirming the endothermic mixing process due to different polarity between water and ethanol. The presence of electrolyte even reduce more their molecular interaction. However, the change to irregularity result a high positive entropy values that result the negative Gibbs free energy. It confirms the spontaneity of mixing. The vaporization enthalpy, Hvap, of water-ethanol mixture is 76.229 kJ/mol and it becomes 235.366 kJ/mol and 126.189 kJ/mol after the addition of NaOH and KOH. It indicates that the presence of electrolyte inhibites vaporization of water as the major component and allowing ethanol molecules to vapor producing more high purity ethanol.
Desulfurisasi Katalitik Tiofen Menggunakan Katalis CoMo/USY dalam Reaktor Batch Nugrahaningtyas, Khoirina Dwi; Pratiwi, Nanda; Heraldy, Eddy
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.2368.119-130

Abstract

Telah dilakukan uji aktivitas katalis CoMo/USY pada reaksi desulfurisasi tiofen. Reaksi dilakukan pada reaktor sistem batch dengan tekanan gas N2 sebesar 1 bar gas N2 dan waktu reaksi selama 1 jam. Penelitian ini bertujuan untuk mengetahui pengaruh variasi temperatur dan variasi karakter katalis pada reaksi desulfurisasi tiofen. Product desulfurisasi dianalisis dengan Gas Chromatography - Mass Spectra (GC-MS). Karakter kestabilan struktur katalis dilihat dengan analisis menggunakan instrumen Fourier Transform Infrared Spectroscopy (FT-IR). Hasil analisis terhadap uji aktivitas desulfurisasi menunjukkan bahwa pada rentang temperatur 200-300°C, rendemen bertambah dengan meningkatnya temperatur. Pada penelitian telah berhasil menghidrogenasi tiofen, tetapi belum bisa menghilangkan kandungan sulfurnya. Adapun efek karakter katalis terhadap aktivitas katalitiknya menunjukkan bahwa karakter katalis yang paling dominan adalah sifat keasaman. Katalis dengan keasaman tertinggi, yaitu katalis CoMo/USY, memiliki aktivitas tertinggi dengan rendemen produk sebesar 2,88%. Hasil analisis FT-IR terhadap katalis bekas menunjukkan bahwa struktur cukup stabil dan tidak ada pengotor yang terikat pada katalis.Catalytic Desulfurization of Thiophene using CoMo/USY Catalyst in Batch Reactor. CoMo/USY catalyst activity has been tested for thiophene desulfurization reaction. The reaction was carried out in batch system reactor with N2 gas pressure of 1 bar and reaction time for 1 hour. This study aims to determine the effect of temperature variation and catalyst character variation in thiophene desulfurization reaction. The desulfurization products were analyzed by Gas Chromatography - Mass Spectra (GC-MS). The characters of structure catalyst were analyzed by Fourier Transform Infrared Spectroscopy (FT-IR). The results of the analysis of the desulfurization activity test showed that in the temperature range 200-300 °C, the yield raised with increasing temperature. The analysis results of the desulfurization activity test showed that in the temperature range of 200-300°C, the yield raised with increasing temperature. The study has successfully hydrogenated thiophene, but has not been able to eliminate the sulfur content. The effect of the catalysts character on its catalytic activity shows that the most dominant character of the catalysts was its acidity. The highest acidity catalyst, CoMo/USY catalyst, has highest activity with the product yield of 2,88%. The result of the FTIR analysis on the used catalyst show that the structure was stable and no impurities were attached the catalyst.