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All Journal Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK METANA Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI IPTEK The Journal for Technology and Science Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences Majalah Ilmiah MOMENTUM Science and Technology Indonesia Indonesia Journal of Halal Abdimas UNWAHAS : Jurnal Pengabdian Masyarakat UNWAHAS Jurnal Profesi Insinyur Indonesia Bulletin of Chemical Reaction Engineering & Catalysis
Luqman Buchori
Departemen Teknik Kimia, Fakultas Teknik, Universitas Diponegoro Jl Prof Sudharto, SH, Tembalang, Semarang, 50275, Telp/fax: (024)7460058
Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics Social Sciences Transportation

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Effects of Weight Hourly Space Velocity and Catalyst Diameter on Performance of Hybrid Catalytic-Plasma Reactor for Biodiesel Synthesis over Sulphated Zinc Oxide Acid Catalyst Luqman Buchori; Istadi Istadi; Purwanto Purwanto
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 2 Year 2017 (August 2017)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.12.2.775.227-234

Abstract

Biodiesel synthesis through transesterification of soybean oil with methanol on hybrid catalytic-plasma reactor over sulphated zinc oxide (SO42-/ZnO) active acid catalyst was investigated. This research was aimed to study effects of Weight Hourly Space Velocity (WHSV) and the catalyst diameter on performance of the hybrid catalytic-plasma reactor for biodiesel synthesis. The amount (20.2 g) of active sulphated zinc oxide solid acid catalysts was loaded into discharge zone of the reactor. The WHSV and the catalyst diameter were varied between 0.89 to 1.55 min-1 and 3, 5, and 7 mm, respectively. The molar ratio of methanol to oil as reactants of 15:1 is fed to the reactor, while operating condition of the reactor was kept at reaction temperature of 65 oC and ambient pressure. The fatty acid methyl ester (FAME) component in biodiesel product was identified by Gas Chromatography - Mass Spectrometry (GC-MS). The results showed that the FAME yield decreases with increasing WHSV. It was found that the optimum FAME yield was achieved of 56.91 % at WHSV of 0.89 min-1 and catalyst diameter of 5 mm and reaction time of 1.25 min. It can be concluded that the biodiesel synthesis using the hybrid catalytic-plasma reactor system exhibited promising the FAME yield. 
Effects of Ion Exchange Process on Catalyst Activity and Plasma-Assisted Reactor Toward Cracking of Palm Oil into Biofuels Istadi Istadi; Luqman Buchori; Didi Dwi Anggoro; Teguh Riyanto; Anindita Indriana; Chusnul Khotimah; Fachmy Adji Pangestu Setiawan
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 2 Year 2019 (August 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.2.4257.459-467

Abstract

Biofuels can be produced through a conventional catalytic cracking system and/or a hybrid catalytic-plasma cracking system. This paper was focused on studying effect of Na+ ion exchange to HY-Zeolite catalyst on catalyst performance to convert palm oil into biofuels over a conventional continuous fixed bed catalytic cracking reactor and comparing the catalytic cracking performance when carried out in a continuous hybrid catalytic-plasma reactor. The catalysts were characterized by X-ray Diffraction (XRD) and Bruneuer-Emmet-Teller (BET) surface area methods. The biofuels product were analyzed using Gas Chromatography-Mass Spectrometry (GC-MS) to determine the hydrocarbons composition of biofuels product. From the results, ion exchange process of Na+ into HY-Zeolite catalyst decreases the catalyst activity due to decreasing the number of active sites caused by blocking of Na+ ion. The selectivity to gasoline ranges achieved 34.25% with 99.11% total conversion when using HY catalyst over conventional continuous fixed bed reactor system. Unfortunately, the selectivity to gasoline ranges decreased to 13.96% and the total conversion decrease slightly to 98.06% when using NaY-Zeolite catalyst. As comparison when the cracking reaction was carried out in a hybrid catalytic-plasma reactor using a spent residual catalytic cracking (RCC) catalyst, the high energetics electron from plasma can improve the reactor performance, where the conversion and yield were increased and the selectivity to lower ranges of hydrocarbons was increased. However, the last results were potential to be intensively studied with respect to relation between reactor temperature and plasma-assisted catalytic reactor parameters. Copyright © 2019 BCREC Group. All rights reserved 
Reusability and Stability Tests of Calcium Oxide Based Catalyst (K2O/CaO-ZnO) for Transesterification of Soybean Oil to Biodiesel Istadi Istadi; Udin Mabruro; Bintang Ayu Kalimantini; Luqman Buchori; Didi Dwi Anggoro
Bulletin of Chemical Reaction Engineering & Catalysis 2016: BCREC Volume 11 Issue 1 Year 2016 (April 2016)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.11.1.413.34-39

Abstract

This paper was purposed for testing reusability and stability of calcium oxide-based catalyst (K2O/CaO-ZnO) over transesterification reaction of soybean oil with methanol to produce biodiesel. The K2O/CaO-ZnO catalyst was synthesized by co-precipitation method of calcium and zinc nitrates followed by impregnation of potassium nitrate. The fresh and used catalysts were tested after regeneration. The catalysts were characterized by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and BET Surface Area in order to compare the catalyst structure between the fresh and used catalysts. The catalyst testing in transesterification proses was carried out at following operating conditions, i.e. catalyst weight of 6 wt.%, oil to methanol mole ratio of 1:15, and temperature of 60 oC. In addition, metal oxide leaching of K2O/CaO-ZnO catalyst during reaction was also tested. From the results, the catalysts exhibited high catalytic activity (80% fatty acid methyl ester (FAME) yield after three-cycles of usage) and acceptable reusability after regeneration. The catalyst also showed acceptable stability of catalytic activity, even after three-cycles of usage. 
Effect of Co and Mo Loading by Impregnation and Ion Exchange Methods on Morphological Properties of Zeolite Y Catalyst Didi Dwi Anggoro; Nur Hidayati; Luqman Buchori; Yayuk Mundriyastutik
Bulletin of Chemical Reaction Engineering & Catalysis 2016: BCREC Volume 11 Issue 1 Year 2016 (April 2016)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.11.1.418.75-83

Abstract

Coal tar can be used as an alternative raw material for the production of liquid fuels, such as: gasoline and diesel through hydrogenation and cracking process. Hydrogenation and cracking process requires a catalyst which has metal components for hydrogenation reaction and acid components for cracking reaction. In this study, the Co/Zeolite Y and Co-Mo/Zeolite Y catalysts were prepared by impregnation and ion exchange methods. Characterizations of the catalysts were carried out by X-Ray Diffraction (XRD) and gravimetric acidity. The catalysts were tested for coal tar conversion to liquid fuel under various temperatures, amount of catalyst and hydrogen flow rates in a fixed bed flow reaction system. Liquid fuels products were analyzed by gas chromatography (GC). The XRD Spectra indicated that the addition of Co and Mo metals did not affect catalysts structure, however it alters the percentage of crystallinity. The addition of Co metal using impregnation method caused reduction in crystallinity, while the addition of Mo caused improvement of crystallinity. The Co-Mo/Zeolite Y catalyst with highest crystallinity was obtained by loading using ion exchange method. The addition of Co and Mo metals caused increasing acidity. However, the increasing composition of Co and Mo loaded on Zeolite Y catalyst decreased the yield of liquid fuels from coal tar. It can be concluded that the yields of liquid fuels and the composition of gasoline fractions from hydrocracking of coal tar were highly dependent on  acidity of the catalyst. 
EKSTRAKSI ANTOSIANIN BUNGA DADAP MERAH MENGGUNAKAN METODE MAE (MICROWAVE ASSISTED EXTRACTION) Damayanti, Astrilia; Buchori, Luqman; Sulardjaka, S
Indonesia Journal of Halal Vol. 3 (2) 2020
Publisher : Pusat Kajian Halal Undip

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/halal.v3i2.9424

Abstract

Antosianin merupakan sumber bahan pewarna alami, di mana selain karotenoid, klorofil, dan flavonoid yang dapat dimanfaatkan untuk mendukung performa Dye Sensitized Solar Cells (DSSC) atau sel surya peka warna. Ekstraksi dengan metode Microwave Assisted Extraction (MAE) meningkatkan hasil dan laju reaksi. Penelitian menggunakan metode deskriptif dengan variabel penelitian daya microwave yang bertujuan untuk mengetahui pengaruh daya microwave dalam proses ekstraksi antosanin bunga dadap merah. Hasil penelitian menunjukkan bahwa gelombang mikro dalam microwave mampu mempercepat proses ekstraksi dibutuhkan 12-15 menit dengan daya 300 W, 450 W dan 600 W. Hasil menunjukkan bahwa  total antosianin yang dihasilkan secara berurutan 9,518 mg/L (menit ke-12 daya, 300W); 2,755 mg/L (menit ke-15, daya 450W)  dan 2,839 mg/L (menit ke-12, daya 600W). Ekstraksi antosianin dadap merah menggunakan mikrowave lebih cepat 10 kali dan lebih besar yield 3-10 kali daripada konvensional 180 menit (0,8350 mg/L)
Effect of CaO/Fe2O3 Ratio and Oil/Methanol Molar Ratio on Biodiesel Production from Waste Cooking Oil Buchori, Luqman; Setiadi, Iqfan Dwi; Nurushofa, Faustina Alda; Anggoro, Didi Dwi
Reaktor Volume 24 No.1 April 2024
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.24.1.1-6

Abstract

Biodiesel is a renewable liquid fuel that can be produced through the transesterification reaction of biomass. The objective of this research was to examine the effect of comparative composition of CaO and Fe2O3 on CaO/Fe2O3 catalysts from eggshells and Fe2O3 in the production of biodiesel from waste cooking oil. In addition, it was also studied the effect of the ratio of oil and methanol on the yield and characteristics of the biodiesel produced. Catalysts were prepared through impregnation. The esterification-transesterification process was carried out with the conditions WCO:methanol molar ratio of 1:3, 1:6, 1:9, 1:12 and 1:15, catalyst (3%wt oil), heated at 65°C for 3 hours with a stirring scale of 1200 rpm. The results showed biodiesel production using CaO: Fe2O3 catalyst with the ratio of CaO: Fe2O3 70:30 and WCO:methanol molar ratio of 1:9 obtained higher yield (84.5%) compared to others. The best biodiesel yield produced is the CaO:Fe2O3 catalyst ratio of 70:30 and the WCO:methanol molar ratio of 1:9 with a biodiesel yield of 84.50% with a methyl ester content of 99.63% and a FAME yield of 84.14%. The biodiesel produced has met the requirements of the Indonesian National Standard (SNI) in terms of density and viscosity.
Kajian Peranan dan Penerapan Kode Etik Profesi Keinsinyuran dalam Praktik Pekerjaan Bidang Sipil dan Lingkungan di Indonesia untuk Meningkatkan Efisiensi dan Perlindungan Keselamatan Kerja Handika, Rizki Andre; Istikhoratun, Titik; Buchori, Luqman
Jurnal Profesi Insinyur Indonesia Vol 2, No 3 (2024): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/elipsoida.%Y.23056

Abstract

Kode etik memberikan pegangan bagi para insinyur untuk menjaga integritas dan menopang keberhasilan pekerjaannya. Sementara penerapannya terus berkembang dalam pekerjaan perekayasaan, ulasan dan praktik-praktik baik penerapannya di Indonesia masih belum banyak didiskusikan. Artikel ini bertujuan untuk mengkaji peran dan implementasi kode etik profesi insinyur dalam pekerjaan bidang sipil dan lingkungan di Indonesia dengan mencari dan menemukan literatur yang relevan berdasarkan metode PRISMA. Dari 500 referensi yang dikumpulkan, tersaring 30 dengan semuanya adalah artikel yang layak untuk dianalisis dan direviu lebih lanjut. Ditemukan bahwa penekanan kode etik insinyur bidang sipil dan lingkungan di Indonesia secara teoritik terdapat pada dua aspek, norma dan profesionalisme, dimana penerapannya sudah meluas mulai dari kegiatan pembangunan, operasional dan pemeliharaan, hingga dalam pengembangan program-program unggulan daerah. Namun demikian, faktor-faktor relevan lainnya di lapangan masih diperlukan, baik sifatnya internal (berupa kemampuan interpersonal maupun atribut dan kemampuan teknis dan spesifik) dan eksternal (antara lain budaya organisasi, lingkungan kerja, gaya kepemimpinan, komitmen organisasi, dan kompensasi). Peran pendidikan etik dalam pembelajaran keinsinyuran menjadi krusial dan dituntut untuk selalu diperbarui sesuai dengan kebutuhan profesional insinyur agar membantu menyiapkan insinyur muda yang berintegritas, bertanggung jawab dan mampu diandalkan di lapangan. Kata kunci: kode etik, insinyur, profesional, integritas, pendidikan
Peta Jalan (Roadmap) Hilirisasi Industri Manufaktur Berbasis Logam untuk Mendukung Ibu Kota Nusantara (IKN) di Kalimantan Timur Pratama, Pambudi Pajar; Buchori, Luqman; Purbasari, Aprilina
Jurnal Profesi Insinyur Indonesia Vol 2, No 1 (2024): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2024.21322

Abstract

Pemindahan Ibu Kota Negara (IKN) dilakukan sebagai salah satu strategi mendorong percepatan pengurangan kesenjangan ekonomi dan peningkatan pertumbuhan perekonomian di luar Jawa, terutama Kawasan Timur Indonesia. Pembangunan kawasan industri merupakan salah satu faktor penentu dalam perkembangan industri manufaktur pada suatu wilayah. Kawasan Industri adalah kawasan tempat pemusatan kegiatan industri yang dilengkapi dengan sarana dan prasarana penunjang yang dikembangkan dan dikelola oleh Perusahaan Kawasan Industri. Dalam kajian ini, akan difokuskan hanya 4 (empat) mineral strategis yang bisa dikembangkan di dalam Kawasan Industri maupun Kawasan Peruntukan Industri yang mendukung IKN yaitu nikel, bauksit, tembaga, dan timah dimana diharapkan pada periode waktu tertentu dapat memberikan petunjuk tahapan langkah yang perlu dilakukan untuk mencapai usulan target pada tiap program baik turunan maupun utama serta menjadi acuan pemerintah di dalam negeri dalam perencanaan, pemanfaatan, pengendalian, serta pengembangan sumber daya alam. Pelaksanaan penyusunan kajian dilakukan dengan pengumpulan literatur, kajian, pertemuan rutin tim dan wawancara penyusun naskah akademik dengan narasumber, yang kemudian disosialisasikan dengan Focus Group Discussion (FGD) dan diskusi publik. Pembangunan hilirisasi industri komoditas nikel untuk mendukung industri prioritas baterai kendaraan listrik dan stainless steel, sedangkan untuk komoditas bauksit yaitu membangun industri aluminium untuk panel surya, komponen EV Battery Pack, food packaging, dan komponen elektrikal, Untuk komoditas tembaga yaitu untuk mendukung industri prioritas kabel dan penggerak motor listrik/dinamo, serta komoditas timah yaitu membangun industri timah untuk mendukung industri prioritas tin chemical, PCB, industri elektronika. Kata kunci: peta jalan, hilirisasi, industri manufaktur, logam, IKN
Preparation of KI/KIO3/Methoxide Kaolin Catalyst and Performance Test of Catalysis in Biodiesel Production Buchori, Luqman; Widayat; Ngadi, Norzita; Hadiyanto; Okvitarini, Ndaru
Science and Technology Indonesia Vol. 9 No. 2 (2024): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.2.359-370

Abstract

Kaolin is a natural ingredient that is in abundance and has not been widely used. Kaolin is a source of silica (SiO2) and alumina (Al2O3) so that it can be used as a heterogeneous catalyst in biodiesel production. This research aims to examine the influence of using impregnated kaolin as a heterogeneous catalyst on production of biodiesel. Research methods include calcination of natural kaolin, impregnation of kaolin using KI, KIO3, and preparation of kaolin-methoxide in various concentrations, as well as biodiesel production using an impregnated kaolin catalyst. The catalyst was characterized using XRD and SEM. The catalyst was tested for basicity using the Hammet indicator method with acid-base titration. The biodiesel product obtained was analyzed using GCMS. The results of XRD analysis showed that 8% kaolin-methoxide catalyst had the highest crystallinity among the others. The crystallinity obtained was 87.84% with a composition of 15.79% SiO2 and 78.86% Al2O3. SEM image results also show a more visible crystal shape. The highest basicity of the catalyst obtained was 0.240 mmol. The highest biodiesel yield using 8% kaolin-methoxide catalyst is 99.48%.
OPTIMASI PROSES POLIMERISASI MINYAK KULIT JAMBU METE (CNSL, CASHEW NUT SHELL LIQUID) DENGAN FORMALDEHID Luqman Buchori
TEKNIK Vol 31, No 2 (2010)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.418 KB) | DOI: 10.14710/teknik.v31i2.1769

Abstract

Jambu mete represents the crop which is a lot of its benefit. From various benefit of jambu mete, there is onepart of which not yet been exploited in an optimal that is husk. Whereas in its husk is contain oil so-calledCashew Nut Shell Liquid (CNSL) about 32-36%. This oil can be used as natural source phenol and alternativelysubstitution phenol from petroleum. This phenol is reacted by formaldehyde will form the phenol formaldehyderesin. Besides containing natural phenol, CNSL also contain the other bunch like karboksilat bunch, alkylbunch and alkenes bunch. This bunch will influence process of forming of phenol formaldehyde resin as aconsequence have an effect on characteristic and quality of resin so that require to be searched the optimumcondition in making of phenol formaldehyde resin. Objective of this research is to look for the optimumcondition in making of phenol formaldehyde resin of novolac type and also know the influence of comparison ofreactant and operating temperature for to resin yielded. Dependent variables in this research are reactorvolume (500 ml) with the volume bases 250 ml, catalyst acid HCl, mixing speed (200 rpm), operating time (90minute), pH (2) and operating pressure (1 atm). Independent variables are CNSL/formaldehyde ratio andoperating temperature. Perceived parameter is free rate formaldehyde. Method is used to design and processdata is RSM (Response Surface Methodology) method constructively the Static program. Result of this researchindicates that the most effect on variable is ratio CNSL/formaldehyde. Optimum condition are obtained at F/Cratio of 0.65-0.85 and temperature of 75-850C with the conversion of 0.55. The biggest rate resin obtained atF/C ratio 0.75/1 and temperature 80oC. This resin is very jell and have best sticky and also drug after runningdry. This novolac resin is applicated as furniture coating. Coating yielded have well sticky with the auburncolor.
Co-Authors . Widayat Amin Nugroho Anggun Kurniawan Anindita Indriana Aprilina Purbasari Ardian D. Yudhistira Arum Sakti Prasetyo Astrilia Damayanti B Budiyono Berkah Fajar Bintang Ayu Kalimantini Boby Gusman Irianto Samosir Budiyono Budiyono Chusnul Khotimah Dewi Fatmawati Didi D. Anggoro Didi D. Anggoro Didi Dwi Anggoro Dinda Labibah Ubay Dyah Hesti Wardhani Dyah Hesti Wardhani Fachmy Adji Pangestu Setiawan Faleh Setia Budi Faleh Setia Budi Fegi Yuliandri Fradriyan Aulia Giveni Christina Silaen H Hadiyanto Hantoro Satriadi Hargono Hargono Harum Nissaulfasha Herawati Oktavianty Heri Cahyono Heru Susanto I Nyoman Widiasa I. Istadi I.G.B Ngurah Makertihartha Indro Sumantri Inshani Utami Istikhoratun, Titik JD Ryan Christy S Khonsa Syahidah Kusmiyati Kusmiyati Laeli Kurniasari M. Dani Supardan M. Dani Supardan M. Djaeni Maria Augustine Graciafernandy Meitiandari Mutiara Muhamad, Theobroma Guntur Muhammad Ulil Absori Nadia Taradissa Maheswari Ndaru Okvitarini Ngadi, Norzita Nita Aryanti Norzita Ngadi Nur Hidayati Nurjati Solikhin Nurul Aishah Aishah Nurushofa, Faustina Alda Okryreza Abdurrachman P Purwanto Pakpahan, Agnes J. Pakpahan, Andre W. S. Pratama, Pambudi Pajar Purwanto Purwanto Purwanto Purwanto Putri Diliyan Shakti Ratnawati Ratnawati Resti Nur Utami Riko Rikardo Putra Riyanto, Teguh Rizki Andre Handika Roikhatus Solikhah Salsabila, Unik Hanifah Saputra, Roni Ade Setia Budi Sasongko Setiadi, Iqfan Dwi Silviana Silviana Siswo Sumardiono Suherman Suherman Suherman Suherman Sulardjaka, S Teguh Riyanto Teuku Irfan Maulana Titik Istirokhatun Udin Mabruro Wahyu Fitriani Widayat Widayat Widayat Yayuk Astuti Yazid Bindar Yazid Bindar Yudha Duta Utama