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All Journal Reaktor Jurnal Teknik ITS IPTEK Journal of Proceedings Series Bulletin of Chemical Reaction Engineering & Catalysis The Journal of Pure and Applied Chemistry Research Indonesian Journal of Chemistry Walisongo Journal of Chemistry REACTOR : Journal of Research On Chemistry And Engineering Sewagati Bulletin of Chemical Reaction Engineering & Catalysis

Danawati Hari Prajitno

Departemen Teknik Kimia Industri Institut Teknologi Sepuluh Nopember Surabaya

Author-ID : 249457

Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Other

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Pengaruh Doping Ca dan K pada γ-Al2O3 terhadap Sifat Fisik Katalis pada Transesterifikasi Minyak Kelapa Eko Supriadi; Danawati Hadi Prajitno; Mahfud Mahfud; Ngatijo Ngatijo; Rahmat Basuki
REACTOR: Journal of Research on Chemistry and Engineering Vol 2, No 1 (2021): Published in June 2021
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v2i1.20

Metal doping plays important role in increasing catalytic activity of catalyst materials. In this work, Ca and K were doped to the γ-Al2O3 by dry impregnation method to study the crystallinity, surface area, activation energy, and yield in the coconut oil transesterification reaction. The success of doping was shown in the characterization of Ca/γ-Al2O3 and K/γ-Al2O3 using X-Ray Diffraction (XRD) which increasing in crystallinity from 62.2% (γ-Al2O3) to 69.3 (K/γ-Al2O3) and 76.0 (Ca/γ-Al2O3). The emerging peak of 2θ characteristics of K (29.70° and 32.65°) and Ca (25.35°, 26.77°, and 27.17°) on the γ-Al2O3 (37.66°, 45.82° and 67.22 °) was also observed. Characterization by the Surface Area Analyzer (SAA) shows that the K/γ-Al2O3 catalyst has a smaller surface area (34.03 m2/g) than Ca/γ-Al2O3 (83.77 m2/g), but a higher pore diameter (66.12 Å) than Ca/γ-Al2O3 (35.22 Å). The K/γ-Al2O3 catalyst produced greater FAME yield (93.19%) than Ca/γ-Al2O3 (29.76%) at a catalyst concentration of 2.5%, reaction time 150 s, and ultrasonic frequency of 40 kHz. The quality of the FAME catalyzed by K/γ-Al2O3 fulfills four test parameters: density, kinematic viscosity, flash point, and pour point according to SNI 04-7182-2006 standards.

Produksi Biofuel dari Minyak Kelapa Sawit dengan Katalis Au/HZSM-5 dan Kompositnya Tillotama Anindita Sari; Nur Jannah; Danawati Hari Prajitno
Jurnal Teknik ITS Vol 1, No 1 (2012)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Semakin meningkatnya kebutuhan dan konsumsi bahan bakar minyak menyebabkan cadangan minyak bumi semakin menipis sehingga perlu adanya pengembangan bahan lain sebagai sumber bahan bakar alternatif yang dapat menggantikannya. Salah satu produk energi alternatif yang ramah lingkungan dan dapat diperbaharui adalah biofuel. Perubahan minyak sawit menjadi biofuel salah satunya adalah dengan proses perengkahan katalitik. Penelitian ini bertujuan untuk mengatasi masalah tersebut dimana dalam penelitian ini akan dipelajari kondisi operasi dan unjuk kerja katalis Au/HZSM-5 sintetis dan kompositnya pada reaksi perengkahan minyak sawit menjadi biofuel. Penelitian ini diharapakan mampu menghasilkan teknologi pembuatan katalis baru dan teknologi proses baru dalam proses produksi biofuel pada proses perengkahan katalitik asam palmitat dari minyak sawit. Pada penelitian ini biofuel telah berhasil diperoleh pada proses perengkahan minyak sawit menggunakan katalis Au/HZSM-5 sintetis dan kompositnya pada berbagai temperatur dan laju alir gas N2. Penelitian dilakukan dengan tiga tahapan yaitu sintesa katalis, karakterisasi katalis dan proses perengkahan katalitik. Au/HZSM-5 disintesa dengan metode Plank dan katalis komposit disentesa berdasarkan penelitian yang telah dilakukan oleh Qjang Tang et all. Hasil yang telah berhasil disintesa dikarakterisasi dengan Energy Difraction X-Ray (EDX), X-Ray Difraction (XRD) dan Brunaur Emmet Teller (BET). Dari hasil karakterisasi dapat disimpulkan bahwa katalis yang telah disintetis telah memenuhi syarat untuk digunakan sebagai katalis pada proses perengkahan. Proses perengkahan katalitik dilakukan dalam suatu mikroreaktor fixed bed dengan berat katalis yang digunakan sebanyak 2 gram dan proses perengkahan dimulai saat gas N2 dialirkan selama 60 menit. Proses perengkahan dilakukan pada variasi temperatur 350-550 °C dan laju alir gas N2 90-400 ml/min. Hasil perengkahan dianalisa dengan metode gas kromatografi. Hasil yang diperoleh untuk katalis Au/HZSM-5 yield tertinggi kerosene 25,24%, gasoline 15,69% dan diesel 10,71% pada temperatur reaktor 500 °C dengan laju alir gas N2 90 ml/min. Untuk katalis Komposit (HZSM-5/MCM-41) yield tertinggi diesel 26,53%, kerosene 19,26% dan gasoline 6,41% pada temperatur 450 °C laju alir 300 ml/min serta pada temperatur 350 °C dengan laju alir 90 ml/min dengan yield diesel tertinggi 24,38%, kerosene 18,84% dan gasoline 4,41%.

Rekayasa Katalis Ni/Zn-HZSM-5 untuk Memproduksi Biofuel dari Minyak Bintaro Muhammad Iqbal; Victor Purnomo; Danawati Hari Prajitno
Jurnal Teknik ITS Vol 3, No 2 (2014)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Sumber energi alternatif terbarukan sangat diperlukan pada masa kini, sebab penggunaan sumber energi fosil tidak dapat menjadi andalan untuk masa depan. Hal ini karena sumber energi fosil semakin menipis dan penggunaannya menghasilkan emisi CO2 yang tidak ramah lingkungan. Salah satu sumber energi alternatif yang menjanjikan adalah biofuel. Biofuel merupakan sumber energi terbarukan dan ramah lingkungan. Penelitian ini bertujuan untuk mempelajari pengaruh katalis berpromotor ganda Ni/Zn-HZSM-5 dan suhu terhadap proses perengkahan minyak bintaro untuk memproduksi biofuel. Variabel yang digunakan adalah perbandingan massa Ni terhadap Zn, perbandingan massa logam terhadap katalis total serta suhu. Parameter kualitas biofuel dapat dilihat dari nilai selektivitas. Selektivitas maksimum gasoline sebesar 52,42% tercapai pada suhu 350°C dan selektivitas maksimum kerosene sebesar 86,72% tercapai pada suhu 400°C pada pengguunaan katalis dengan perbandingan Ni:Zn sebesar 1:1 dengan logam 2% massa total katalis. Diperlukan penelitian yang lebih lanjut untuk memproduksi biofuel yang lebih berkualitas pada suhu yang lebih tinggi dan massa katalis yang lebih besar.

Production of Biofuel by Hydrocracking of Cerbera Manghas Oil Using Co-Ni/HZSM-5 Catalyst : Effect of Reaction Temperature Lenny Marlinda; Muhammad Al Muttaqii; Achmad Roesyadi; Danawati Hari Prajitno
The Journal of Pure and Applied Chemistry Research Vol 5, No 3 (2016)
Publisher : Chemistry Department, The University of Brawijaya

This research aims to investigate the effect of various reaction temperatures on the hydrocracking of Cerbera manghas oil to produce biofuel as a paraffin-rich mixture of hydrocarbons with Co-Ni/HZSM-5 catalyst. Co-Ni/HZSM-5 catalyst was prepared by incipient wetness impregnation. The catalyst was characterized by X-ray diffraction (XRD), N2 physisorption according to the Brunauer-Emmet-Teller (BET) method, and atomic absorption spectrometry (AAS). The hydrocracking reaction was carried out in a pressure batch reactor, reaction temperatures of 300-375 oC for 2 hours, reactor pressure of 15 bar after flowing H2 for at least 1 hour, and a catalyst/oil ratio of 1 g/200 ml. The hydrocarbon composition was determined by gas chromatography-mass spectrometry (GC-MS). With the Co(0.88%)-Ni(3.92%)/HZSM-5 catalyst, the highest yield for gasoil was 46.45% at temperature of 350 oC. At this reaction temperature condition, the main abundant hydrocarbon compounds in gasoil-like hydrocarbon were n-paraffin, i.e. pentadecane of 20.06 area% and heptadecane of 14.13 area%. Biofuels produced showed that abundant hydrocarbon compounds were different at different reaction temperatures. Iso-paraffin with low freezing point and good flow property were not found in gasoil-like hydrocarbon. Isomerization depends on reaction condition and type of catalyst.

Co-Ni/HZSM-5 Catalyst for Hydrocracking of Sunan Candlenut Oil (Reutealis trisperma (Blanco) Airy Shaw) for Production of Biofuel Muhammad Al Muttaqii; Lenny Marlinda; Achmad Roesyadi; Danawati Hari Prajitno
The Journal of Pure and Applied Chemistry Research Vol 6, No 2 (2017): Edition of May-August 2017
Publisher : Chemistry Department, The University of Brawijaya

The production of biofuel by hydrocracking of Sunan candlenut oil as renewable energy can substitute fossil energy. The purpose of this work is to produce biofuel by hydrocracking of Sunan candlenut oil with Co-Ni/HZSM-5 catalyst. The catalyst was prepared by incipient wetness impregnation method. The characterization of catalyst was determined by X-Ray Diffraction (XRD) and nitrogen adsorption-desorption isotherms. The functional groups of the hydrocarbon was determined by Fourier Transform Infrared (FT-IR). The hydrocarbon composition was determined by Gas Chromatography Mass Spectrometry (GC-MS). The results showed that biofuel composition consist of 0.14 area% isoparaffins, 12.29 area% cycloparaffins, 6.87 area% normal paraffins, 4.18 area% olefin, and 10.52 area% aromatics, and oxygenated compounds including 35.03 area% carboxylic acids. It was necessary to be done that the oxygenated compounds in biofuel were eliminated to produce the abundant paraffin hydrocarbons at reaction temperature above 350 oC.

Synthesis and Characterization of Ni/Hydrotalcite and Its Application in Hydrocracking Calophyllum Inophyllum Oil Hafshah Hafshah; Danawati Hari Hari Prajitno; Achmad Roesyadi
The Journal of Pure and Applied Chemistry Research Vol 5, No 3 (2016)
Publisher : Chemistry Department, The University of Brawijaya

This research aims to synthesize hydrotalcite as an alternatives of catalyst support of hydrocracking of vegetable oils. Hydrotalcite can be synthesized in several ways, the most common is coprecipitation method. Hydrotalcite was synthesized using Mg/Al mole ratio of 1: 1, NaOH and Na2CO3 as base solutions. Ni/hydrotalcite catalyst was synthesized by incipicient wetness impregnation method with Ni impregnation of 10% w/w. The characterization of the crystal structure was determined by X-ray diffraction (XRD). The spesific surface area (SBET) was determined by adsorption-desorption of nitrogen, it were obtained 201 m2/g after impregnation and 191 m2/g before impregntion. The test of performance of catalyst was conducted by hydrocracking reaction of Calophyllum inophyllum oil. The liquid products were analyzed by gas chromatography mass spectrometry (GC-MS). Hydrocracking process produced gasoline, kerosene, gas oil with yield of 0.36%, 2.45%, 54.88% respectively, conversion of 96.26% and selectivity of gas oil of 84.39%.

KONVERSI KATALITIK MINYAK SAWIT UNTUK MENGHASILKAN BIOFUEL MENGGUNAKAN SILIKA ALUMINA DAN HZSM-5 SINTESIS Nurjannah Nurjannah; Achmad Roesyadi; Danawati Hari Prajitno
Reaktor Volume 13, Nomor 1, Juni 2010
Publisher : Dept. of Chemical Engineering, Diponegoro University

Terbatasnya sumber energi fosil menyebabkan perlunya pengembangan energi terbarukan yang berasal dari alam dan dapat diperbaharui. Penggunaan bahan bakar minyak bumi, baik dari penggunaan berupa alat transportasi maupun dari penggunaan oleh industri sangat mencemari lingkungan karena tingkat polusi yang ditimbulkan sangat tinggi sehingga perlu mencari bahan bakar alternatif pengganti bahan bakar gasoline, solar, dan kerosene dari minyak nabati. Penelitian dilakukan dalam dua tahapan yaitu sintesa katalis dan proses katalitik cracking. Silika alumina disintesa menggunakan metode Latourette dan HZSM-5 disintesa menggunakan metode Plank. Hasil sintesa dikarakterisasi dengan Penyerapan Spektroskopi Atomis (AAS) menunjukkan bahwa silika alumina dan HZSM-5 mempunyai Si/Al 198 dan 243. Luas permukaan silika alumina dan HZSM-5 diperoleh dari analisa Brunauer Emmet Teller (BET) yaitu 149,91-213,35 m2.g-1 dan ukuran pori rata-rata adalah 13oA. Perengkahan katalitik dilakukan dalam suatu mikroreaktor fixed bed pada temperatur 350-500°C dan laju alir gas N2 100-160 ml.min-1 selama 120 min. Hasil perengkahan dianalisa dengan metode gas kromatografi. Hasil yang diperoleh untuk katalis HZSM-5 fraksi gasoline dengan yield tertinggi 28,87%, kerosene 16,70%, dan diesel 12,20% pada suhu reaktor 4500C dan laju gas N2 100 ml/menit.

Biofuel Produced from Nyamplung Oil Using Catalytic Cracking Process with Zn-HZSM-5 Catalyst Agus Budianto; Danawati Hari Prajitno; Kusno Budhikarjono; Achmad Roesyadi; Ratna Ediati
IPTEK Journal of Proceedings Series Vol 1, No 1 (2014): International Seminar on Applied Technology, Science, and Arts (APTECS) 2013
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2014i1.257

Indonesia Presidential Regulation No. 5/2006 on National Energy Policy suggests that the government should speed up the implementation of the use of alternative energy or fuel substitution. Biofuel synthesis is one way to overcome the shortage of energy and reduce global warming due to the use of fossil fuel. Biofuel can be produced from a variety of vegetable oil. Beside palm oil, nyamplung oil can be used to produce biofuel. The technically main obstacle in producing biofuel is the availability of the catalyst. The availability catalyst are only imported and expensive. Researchers have tried to engineer a new type of catalyst that complete the weakness of zeolite based catalyst. The study was conducted through experimental approaches, testing and observations and conducted the correlation of experiment variables with the quality of the resulted catalyst. The experiment was done by synthesizing catalyst and testing it to produce biofuel from nyamplung oil. The focus of the research is directed to the effect of operating variables on the composition of the resulted biofuel and obtain catalyst performance condition and optimum condition to produce biofuel in the fixed bed reactor. The resulted catalyst can change the nyamplung oil into biofuel. Biofuel from nyamplung oil cracking process showed that the composition is biogasoline, biokerosene and biodiesel. Biodiesel fraction is the highest fraction of the biofuel produced. The highest percentage of biodiesel at a temperature of 400°C was 60%, while the lowest percentage of biodiesel at a temperature of 300°C was 48%. Products density was in the range of 0.81 to 0.86 g/ml. The highest density occured at a reactor temperature of 300 °C was 0.86g/ml. The higher the nitrogen gas flow rate the more the biodiesel formed. At a temperature of 300°C and a nitrogen flow rate of 100 ml/min, the composition solar achieved was 60%.

Zn-Mo/HZSM-5 Catalyst for Gasoil Range Hydrocarbon Production by Catalytic Hydrocracking of Ceiba pentandra oil Yustia Wulandari Mirzayanti; Firman Kurniawansyah; Danawati Hari Prayitno; Achmad Roesyadi
Bulletin of Chemical Reaction Engineering & Catalysis 2018: BCREC Volume 13 Issue 1 Year 2018 (April 2018)
Publisher : Department of Chemical Engineering - Diponegoro University

Biofuel from vegetable oil becomes one of the most suitable and logical alternatives to replace fossil fuel. The research focused on various metal ratio Zinc/Molybdenum/HZSM-5 (Zn-Mo/HZSM-5) catalyst to produce liquid hydrocarbon via catalytic hydrocracking of Ceiba penandra oil. The catalytic hydrocracking process has been applied in this study to crack Ceiba pentandra oil into a gasoil range hydrocarbon using Zn-Mo/HZSM-5 as a catalyst. The effect of various reaction temperature on the catalytic hydrocracking of Ceiba pentandra oil were studied. The Zn-Mo/HZSM-5 catalyst with metal ratio was prepared by incipient wetness impregnation method. This process used slurry pressure batch reactor with a mechanical stirrer. A series of experiments were carried out in the temperature range from 300-400 oC for 2 h at pressure between 10-15 bar. The conversion and selectivity were estimated. The liquid hydrocarbon product were identified to gasoline, kerosene, and gas oil. The results show that the use of Zn-Mo/HZSM-5 can produce gas oil as the most component in the product. Overall, the highest conversion and selectivity of gas oil range hydrocarbon was obtained when the ZnMo/HZSM-5 metal ratio was Zn(2.86 wt.%)-Mo(5.32 wt.%)/HZSM-5 and the name is Zn-Mo/HZSM-5_102. The highest conversion was obtained at 63.31 % and n-paraffin (gas oil range) selectivity was obtained at 90.75 % at a temperature of 400 oC. Ceiba pentandra oil can be recommended as the source of inedible vegetable oil to produce gasoil as an environmentally friendly transportation fuel.

Hydrotalcite Catalyst for Hydrocracking Calophyllum inophyllum Oil to Biofuel: A Comparative Study with and without Nickel Impregnation Hafshah Hafshah; Danawati Hari Prajitno; Achmad Roesyadi
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 2 Year 2017 (August 2017)
Publisher : Department of Chemical Engineering - Diponegoro University

This research aims to study the effect of nickel impregnation into hydrotalcite catalyst that use to convert Calophyllum inophyllum oil into biofuel through hydrocracking process. Hydrocracking process was carried out under mild condition (350 °C and 20 bar) for two hours in a slurry batch reactor. The adding nickel affected the reaction conversion, yield, and selectivity of gasoil. The process of oxygen removal from the compounds in the oil was characterized by Fourier Transform Infrared Spectroscopy (FTIR), and the compositions of the products were determined by Gas Chromatography-Mass Spectrometry (GC-MS). The results of the study successfully proved that nickel impregnated into hydrotalcite catalyst increased the conversion, yield, and selectivity of gasoil up to 98.57 %, 54.15 %, and 81.31 %, respectively.

Co-Authors Achmad Roesyadi Adi Soeprijanto Agus Budianto Agus Surono Agustiani, Elly Ahmad Nezard Dhiaulhaq Altway, Saidah Eko Supriadi Firman Kurniawansyah Hafshah Hafshah Hafshah Hafshah Ignatius Gunardi Irfan Ramadhitya Karenina Anisya Pratiwi Karenina Anisya Pratiwi Kusno Budhikarjono Lailatul Qomariyah Lenny Marlinda Lily Pudjiastuti, Lily Mahfud Mahfud Mahfud Mahfud Mochammad Zayyan Difa Fadhillah Mochammad Zayyan Difa Fadhillah Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Muhammad Iqbal N Nurjannah, N Nurjannah Ngatijo Ngatijo Nurjannah Nurjannah Nurjannah Nurjannah Rachmaniah, Orchidea Rahmat Basuki Ratna Ediati Santi Dyah Savitri Tillotama Anindita Sari Victor Purnomo Yustia Wulandari Mirzayanti Zuchrillah, Daril Ridho

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