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All Journal Reaktor International Journal of Renewable Energy Development TEKNIK METANA Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Seminar Nasional Teknik Kimia Kejuangan Widyariset Widyariset Jurnal Teknik Kimia Indonesia Automotive Experiences Jurnal Profesi Insinyur Indonesia International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis IJF (Indonesia Jurnal Farmasi) Journal of Engineering and Technological Sciences Advance Sustainable Science, Engineering and Technology (ASSET)
Didi Dwi Anggoro
Chemical Engineering Department, Engineering Faculty, Diponegoro University Jl. Prof. Soedarto, SH, Tembalang, Semarang 50239, Telp.(024)7460058
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Transportation

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Basicity Optimization of KF/Ca-MgO Catalyst using Impregnation Method Didi Dwi Anggoro; Luqman Buchori; Setia Budi Sasongko; Herawati Oktavianty
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.4248.678-682

Abstract

This research aimed at determining the optimum value between calcination temperature (X1), calcination time (X2) and %wt KF (X3) toward optimum basicity of KF/Ca-MgO catalyst. Approximately 2-4%wt KF was added to the KF/Ca-MgO catalyst using the impregnation method to assist the Ca-MgO, at 450-550 ºC and a calcination time of 2-4 hours. Furthermore, its basicity was analyzed using Tanabe's titration method. The use of Variance Analysis (ANOVA), indicated that calcination temperature (X1) factor achieved the highest basicity of KF/Ca-MgO catalyst, as indicated by its high F-value (16.46262) and low p-value (0.0067). The correlation between each operating variables and the responses were shown in a mathematical equation. The optimization value is estimated by limiting the calcination temperature from 415.9 to 584.1 ºC, with a calcination time ranging from 1.32 to 4.68 hours, and %wt KF of 1.3182 to 4.6818 % that obtained 1.18 mmol/g for the optimal catalyst basicity. 
Preparation, Characterization, and Activation of Co-Mo/Y Zeolite Catalyst for Coal Tar Conversion to Liquid Fuel Didi Dwi Anggoro; Luqman Buchori; Giveni Christina Silaen; Resti Nur Utami
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.12.2.768.219-226

Abstract

One of many efforts to convert coal tar into alternative liquid fuel is by hydrocracking. This research aims to determine the impregnation of Co-Mo/Y zeolite, its characteristics, the effect of impregnation temperature and time, and also the best Co-Mo/Y zeolite impregnation condition for the conversion of coal tar. This research was conducted in several steps, impregnating Co from Co(NO3)2.6H2O and Mo from (NH4)6Mo7O24.4H2O into Zeolite Y in liquid media, drying at 100 °C for 24 hours, and calcination at 550 °C for 3 hours. Coal tar was then reacted with hydrogen gas (as a reactant), and Co-Mo/Zeolite Y (as a catalyst) was conducted at 350 °C. Characteristic analysis showed that Co and Mo had impregnated into the Y zeolite, as well as it made no change of catalyst’s structure and increased the total acidity. The higher of impregnation temperature was increased the catalyst crystallinity, total acidity, and yield of gasoline. The longer impregnation time was reduced crystallinity value, but total acidity and yield were increased. GC analysis showed that products included into the gasoline product (C8, C9, and C10). 
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. 
PREPARASI DAN KARAKTERISTIK KATALIS COMO/ZEOLIT Y DENGAN METODE PERTUKARAN ION Yayuk Mundriyastutik; Didi Dwi Anggoro; Nur Hidayati
IJF (Indonesia Jurnal Farmasi) Vol 1, No 1 (2016): Indonesia Jurnal Farmasi
Publisher : Universitas Muhammadiyah Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26751/ijf.v1i1.104

Abstract

Preparasi katalis adalah persiapan pembuatan katalis dari bahan baku hingga menjadi sebuah katalis. Metode pertukaran ion di kenal juga dengan metode adsorpsi pada larutan. Prinsip kerja dari metode ini adalah menukarkan ion yang terdapat pada situs aktif pengemban dengan katalis logam. logam yang diembankan pada padatan harus mempunyai kriteria yang terdiri dari stabilitas pengemban, sifat inert pengemban, biaya, legalitas terhadap hak paten. Katalis kobalt dan molybednum merupakan katalis aktif yang sering digunakan untuk reaksi hidrogenasi. Katalis CoMo zeolit Y dibuat dengan metode pertukaran ion yang dilanjutkan dengan proses kalsinasi selama 3 jam dengan suhu 550˚C. Karakterisasi katalis meliputi penentuan kristalinitas dengan XRD, penentuan jumlah situs asam dengan analisa piridin, serta penentuan struktur dan jenis ikatan kimia dengan FTIR. Hasil dari perengkahan Hasil karakterisasi analisa XRD menunjukkan bahwa Co dan Mo sudah teremban ke dalam zeolit Y sebesar 19,0867˚, 12,2274˚, 20,7809˚. Analisa FTIR menunjukkan pergeseran puncak serapan antara zeolit Y dan CoMo zeolit Y. Analisa piridin menujukkan bahwa semakin banyak logam yang teremban semakin meningkat keasamannya dan semakin tinggi keasaman semakin meningkat konversi produk.
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.
Analisis Risiko Kesehatan dan Keselamatan Kerja (K3) Menggunakan Metode JSA (Job Safety Analysis) Pada Pekerjaan Open Trench Proyek PCSP (Palembang City Sewerage Project) Paket B2 A di Perumahan Bari Kota Palembang Nurcahyani, Septra; Wardhani, Dyah Hesti; Anggoro, Didi Dwi
Jurnal Profesi Insinyur Indonesia Vol 1, No 8 (2023): JPII: Nopember -Desember 2023
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2023.23912

Abstract

Pada pembangunan Jaringan SPALD-T Kota Palembang ini mencakup pekerjaan pemasangan pipa uPVC dengan diameter 100 dan 150 mm dan dilakukan dengan metode open trench kedalaman 1,5-2,5 m. Keselamatan dan Kesehatan Kerja (K3) memiliki peran penting dalam pencapaian tujuan proyek pembangunan PCSP (Palembang City Sewerage Project) dan pengendalian yang dilakukan dalam pelaksanaan proyek harus diiringi dengan penerapan Keselamatan dan Kesehatan Kerja yang senantiasa ditaati, agar risiko yang tidak diinginkan dapat diminimalkan. Sehingga diperlukan penyusunan Job Safety Analysis (JSA) untuk mengidentifikasi potensi bahaya, tingat risiko bahaya yang muncul, serta melakukan evaluasi terhadap langkah yang dibutuhkan untuk mengendalikan risiko. Metode yang diguknakan adalah observasi lapangan, wawancara serta dokumentasi pekerjaan. Langkah pertama yang dilakukan adalah mengkategorikan resiko, mengidentifikasi potensi bahaya dan menilai potensi bahaya. Dari analisa tersebut dapat diketahui pekerjaan yang memiliki peluang resiko awal yang tinggi dan mengetahui pengendalian yang dapat dilakukan untuk mencegah potensi bahaya untuk mengurangi peluang terjadinya risiko. Kata kunci: indentifikasi potensi bahaya, penilaian, pengendalian risiko, JSA
Penerapan Lalu Lintas Sistem Satu Arah Sebagai Upaya Peningkatan Jalan Ahmad Yani Kota Tegal Prihiyandhoko, Hageng; Nugroho, Agung; Anggoro, Didi Dwi
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.2024.21305

Abstract

Pemerintah Kota Tegal memperbaiki Ruas Jalan Ahmad Yani sepanjang 760 meter dengan mengusung konsep "Tegal Citywalk" pada tahun 2021. Setelah dua tahun implementasi manajemen rekayasa lalu lintas Sistem Satu Arah (SSA), evaluasi harus dilakukan pada tahun 2023 untuk mengetahui efektivitas penerapan Sistem Satu Arah (SSA). Penelitian ini bertujuan untuk mengetahui beberapa hal terkait penerapan Sistem Satu Arah (SSA) pada Jalan Ahmad Yani Kota Tegal, analisis kinerja lalu lintas dilakukan pada kondisi saat ini untuk mengetahui dan memahami masalah lalu lintas di area penelitian. Manual Kapasitas Jalan Indonesia (MKJI), yang diterbitkan oleh Kementerian Pekerjaan Umum pada tahun 1997. Data yang diambil pada survei penelitian kemudian dianalisa menggunakan Manual Kapasitas Jalan Indonesia (MKJI) Tahun 1997 sehingga didapatkan kapasitas ruas jalan (C) sebesar 1.407 smp/jam. Volume kendaraan pada akhir pekan sebesar 835 smp/jam pada jam sibuk pagi, pada jam sibuk siang sebesar 928 smp/jam dan 675 smp/jam dengan derajat kejenuhan (DS) 0,59 pada jam sibuk pagi, 0,66 pada jam sibuk siang dan 0,46 pada jam sibuk sore. Berdasarkan nilai derajat kejenuhan (DS) tersebut, maka Jalan Ahmad Yani Kota Tegal masuk dalam karakteristik tingkat pelayanan C dimana arus lalu lintas stabil dan kecepatan, gerak kendaraan dapat dikendalikan serta pengemudi dibatasi dalam memilih kecepatan karena masih ruas jalan perkotaan. Kata kunci: sistem satu arah, MKJI 1997, derajat kejenuhan, kinerja lalu lintas, kapasitas jalan
Analisis Risiko Proyek Pembangunan PLTU Kalselteng-2 (2x100MW) di PT PLN (Persero) Primasatya, Dimas; Sulardjaka, Sulardjaka; Anggoro, Didi Dwi
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/jpii.2024.22947

Abstract

Studi ini bertujuan untuk menganalisis risiko proyek Pembangunan PLTU Kalselteng-2 (2x100 MW) dengan menggunakan matrik level risiko antara kriteria kemungkinan dan kriteria dampak terjadinya risiko. Metode penelitian ini mencakup survei, publikasi yang relevan dan penilaian empiris terhadap penerapan risiko proyek yang sebenarnya. Data masukan telah disediakan dari pengalaman proyek pembangkit sebelumnya. Penerapan manajemen risiko ini mencakup 6 tahap berurutan yaitu menentukan sasaran/tujuan, uji sasaran/tujuan, penetapan deskripsi risiko, penetapan kriteria kemungkinan dan dampak, penentuan tingkat risiko terkendali dan penetapan aksi mitigasi. Adapun hasil analisis risiko proyek Pembangunan PLTU Kalselteng-2 terdapat total 53 risiko yang teridentifikasi dengan tingkat risiko ekstrem sejumlah 7 risiko, tingkat risiko tinggi sejumlah 18 risiko dan sisanya tingkat risiko rendah. Disimpulkan bahwa manajemen risiko dapat dilakukan dengan identifikasi risiko dan menerapkan teknik atau strategi yang dipilih untuk pengurangan risiko, pengalihan risiko dan retensi risiko untuk mengantisipasi seluruh risiko yang terjadi pada proyek Pembangunan PLTU. Sistem manajemen risiko harus dijalankan dengan baik agar risiko dapat diminimalkan. Kata kunci: identifikasi, analisis, tingkat risiko, mitigasi, manajemen risiko 
Co-Authors Afriza Ni'matus Sa'adah Aji Prasetyaningrum Andri Cahyo Kumoro Anindita Indriana Anisa Widia Utami Antonio Giovanno Aprilina Purbasari Arif Budiarto Asep Muhamad Samsudin, Asep Muhamad Asmadi, Mohd Bintang Ayu Kalimantini Bobby Rio Indriyantho Buchori , Luqman Cantika Aulia Salsabila Chusnul Khotimah Diah Anggraeni Jatraningrum Dian Cahyaningrum Didik Prasetyoko Dyah Hesti Wardhani Dyah Hesti Wardhani Fachmy Adji Pangestu Setiawan Fadhil Rifqi P Faleh Setia Budi Fathoni, Moch Zaenal FatmaTsaniya Chamdani Febio Dalanta Ganish Eko Mayndra Giveni Christina Silaen H Hadiyanto Hacker, Viktor Hartati Hartati Hartuti Purnaweni Haryono Setiyo Huboyo Hassan, Abdull Hafidz Herawati Oktaviani Herawati Oktavianty Hermawan, Hermawan Herry Santosa I. Istadi Imtinan, Alifa Bakhitah Indro Sumantri Ismail, Siti Norazian Istadi Jamarudin, Aizah Kamsi Nur Oktavia Kevin Aprilio Le Monde, Brilliant Umara Luqman B Luqman Buchori Lutfi Af’idatul Kamilah Melissa Justine Renjaan Mhd. Shaumi Al Anshar Muhamad, Theobroma Guntur Nabilah, Farhanah Nasher, Kharissa Nerfiana Fradevi Nino Rinaldi Nita A Nita Aryanti Nor Aishah Saidina Amin Nor Basid Adiwibawa Prasetya Nugroho, Agung Nur Hidayati Nur Rokhati Nurani Ikhlas Nurcahyani, Septra Nurdiani, Maulida Nurushofa, Faustina Alda P Purwanto Pakpahan, Agnes J. Pakpahan, Andre W. S. Prihiyandhoko, Hageng Primasatya, Dimas Priyo Atmaji Putra, Muhammad Fadila Putri Anggraeni Resti Nur Utami Riko Rikardo Putra Riko Rikardo Putra Riskatama Atmaji Rispiandi Rispiandi Riyanto, Teguh Rohmadona H Rolita, Lisa Roschger, Michaela S Subandriyo Salsabila, Unik Hanifah Saputra, Roni Ade Sari Octavianingrum Setia Budi S Setia Budi Sasongko Setia Budi Sasongko Setiadi, Iqfan Dwi Sigit B Silviana , Silviana Silviana Silviana Slamet Supriyadi Sulardjaka Sulardjaka Teguh Riyanto Triani, Meiri Udin Mabruro Vitus Dwi Yunianto Budi Ismadi Wahyu Bahari Setianto Wahyu Bahari Setianto Wahyudi, Dhiky Wibawa, Muhammad Hanif Dzikri Wirda Udaibah Yayuk Astuti Yayuk Mundriyastutik Yusof, Nurul Asyikin Zainol, Muzakkir Mohamad Zainol, Muzakkir Mohammad Zainuddin, Kamarul Ridwan Zakaria, Zaki Yamani Zaqiyah Addarojah Zulfikar Muriadiputra