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All Journal Jurnal Rekayasa Proses Reaktor International Journal of Renewable Energy Development Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Journal of Engineering and Technological Sciences JURNAL INTEGRASI PROSES Chemistry Indonesian Journal of Chemical Research Jurnal Rekayasa Proses ASEAN Journal of Chemical Engineering Jurnal Teknologi Bahan dan Barang Teknik International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Rekayasa Proses Journal of Engineering and Technological Sciences
Devianto, Hary
Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Other

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The Effect of Counter Electrode Preparation Methods Toward Dye Sensitized Solar Cell Performance Pramujo Widiatmoko; Hary Devianto; Isdiriayani Nurdin; Adriaan Adriaan; Henry Natanail Purwito
Jurnal Teknologi Bahan dan Barang Teknik Vol 8, No 1 (2018)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2731.098 KB) | DOI: 10.37209/jtbbt.v8i1.112

Abstract

Carbon-coated electrodes is superior substitution for platinum electrodes of Dye-Sensitized Solar Cells (DSSC). This paper describes effect of electrode coating methods as well as carbon types on the performance of DSSC. The electrodes were prepared using 3 methods, i.e. doctor blade, metering rod and bubble deposition. Commercial industrial-grade and medical-grade activated carbon were used in this research. The DSSC performance was measured from I-V curve and electrochemical impedance spectroscopy, meanwhile the morphology of coated carbon electrode was studied from Scanning Electron Microscope and Brunauer-Emmett-Teller analysis. It was found that efficiency of DSSC was higher when the counter electrodes were prepared using doctor blade and bubble deposition methods with medical-grade activated carbon. The highest achievement on light-to-electricity conversion was 3.76%.Elektroda bantu karbon merupakan alternatif pengganti elektroda platinum yang baik untuk aplikasi sel surya tersensitisasi pewarna (Dye-Sensitized Solar Cell, DSSC). Makalah ini menjelaskan pengaruh metode pelapisan elektroda bantu serta jenis karbon pada kinerja DSSC. Elektroda disiapkan menggunakan 3 metode yaitu bilah dokter, batang pengaduk dan pelapisan gelembung. Karbon aktif untuk industri dan medis digunakan dalam penelitian ini. Kinerja DSSC ditentukan berdasarkan data kurva I-V dan spektroskopi impedansi elektrokimia, sementara morfologi lapisan karbon pada elektroda dipelajari menggunakan Scanning Electron Microscope dan analisis Brunauer-Emmett-Teller. Efisiensi DSSC lebih tinggi diperoleh ketika elektroda bantu disiapkan menggunakan metode bilah dokter dan pelapisan gelembung dengan karbon aktif medis. Perolehan tertinggi efisiensi konversi cahaya ke listrik adalah 3,76%.
Pemanfaatan Sistem Hibrid Fotovoltaik – PLN pada Elektrolisis Kontinyu untuk Menghasilkan Hidrogen Pramujo Widiatmoko; Tatto Bustomi; Muhammad Mara Ikhsan; Rizky Eka Ahmad; Isdiriayani Nurdin; Hary Devianto
Jurnal Teknologi Bahan dan Barang Teknik Vol 10, No 2 (2020)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37209/jtbbt.v10i2.184

Abstract

Produksi hidrogen melalui elektrolisis menggunakan energi matahari sangat potensial di Indonesia, namun terkendala oleh ketidakstabilan penyinaran matahari. Penggunaan sumber listrik konvensional sebagai komplementer dapat mengatasi ketidakstabilan tersebut. Dalam penelitian ini, elektrolisis air dilakukan dalam sel dengan ruang ganda dengan elektrolit larutan KOH 3 M. Variasi dilakukan terhadap jenis dan bentuk elektroda serta laju alir elektrolit. Sumber energi listrik divariasikan dengan sumber listrik konvensional dari PLN, modul fotovoltaik, serta hibrid dari kedua sistem tersebut. Kinerja elektrolisis dianalisis dengan mengukur volum hidrogen yang terbentuk, rapat energi yang dibutuhkan, serta efisiensi arus listrik. Hasil penelitian menunjukkan penggunaan sistem hibrid dapat menstabilkan produksi hidrogen untuk elektrolisis pada tegangan 15 V selama 7 jam operasi. Dibandingkan dengan penggunaan listrik PLN sepenuhnya, sistem hibrid memberikan peluang penghematan energi hingga 81,64%.
Pengaruh Laju Alir Larutan Asam Sitrat terhadap Korosi Aluminium Isdiriayani Nurdin; Pramujo Widiatmoko; Hary Devianto; Ferdyan Ihza Akbar; Tiara Calista Shandy
Jurnal Teknologi Bahan dan Barang Teknik Vol 8, No 2 (2018)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (512.273 KB) | DOI: 10.37209/jtbbt.v8i2.119

Abstract

Corrosion behaviour of alumina in a citric acid solution has been investigated under a dinamic condition of fluid. The corrosion test was conducted using the Rotating Disk Electrode and potentiostat. The citric acid concentration were 2, 3.5 and 5% w/v. The corrosion rates were found to be severe, within the rate of 2.12 – 24.86 mm/year. The corrosion rate under the citric acid concentration of 5% was found lowest due to the formation of passive layer. The corrosion was of a one step irreversible reaction, and the corossion product of Al2O3 was unstable.Penelitian ini bertujuan untuk mengetahui perilaku korosi aluminium dalam larutan asam sitrat pada kondisi fluida dinamis. Pengujian laju korosi dilakukan dengan menggunakan Rotating Disk Electrode (RDE) dan potensiostat. Konsentrasi asam sitrat divariasikan 2%, 3,5% dan 5%–w/v pada rejim aliran transisi dan turbulen. Hasil penelitian menunjukkan laju korosi aluminium yang ganas, dalam rentang 2,12–24,86 mm/tahun. Konsentrasi asam sitrat 5%-w/v memberikan laju korosi aluminium yang lebih rendah akibat pembentukan lapisan pasif. Reaksi korosi yang terjadi bersifat irreversible satu tahap dengan produk korosi berupa Al2O3 yang tidak stabil.
Performance Evaluation of An Electrolyte-Supported Intermediate-Temperature Solid Oxide Fuel Cell (IT-SOFC) with Low-Cost Materials Fauzi Yusupandi; Hary Devianto; Pramujo Widiatmoko; Isdiriayani Nurdin; Sung Pil Yoon; Tae-Hoon Lim; Aditya Farhan Arif
International Journal of Renewable Energy Development Vol 11, No 4 (2022): November 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.46735

Abstract

Intermediate temperature solid oxide fuel cell (IT-SOFC) provides economic and technical advantages over the conventional SOFC because of the wider material use, lower fabrication cost and longer lifetime of the cell components. In this work, we fabricated electrolyte-supported IT-SOFC using low-cost materials such as calcia-stabilized zirconia (CSZ) electrolyte fabricated by dry-pressing, NiO-CSZ anode and Ca3Co1.9Zn0.1O6 (CCZO) cathode produced through brush coating technique. According to the XRD result, the monoclinic phase dominated over the cubic phase, and the relative density of the electrolyte was low but the hardness of the CSZ electrolyte was close to the hardness of commercial 8YSZ electrolyte. The performance of the single cell was performed with hydrogen ambient air. An open-circuit voltage (OCV) of 0.43, 0.46, and 0.45 V and a maximum power density of 0.14, 0.50, and 1.00 mW/cm2 were achieved at the operating temperature of 600, 700, and 800 °C, respectively. The ohmic resistance of the cell at 700 and 800 °C achieved 81.5 and 33.00 Ω, respectively due to the contribution of thick electrolyte and Cr poisoning in electrodes and electrolyte
Heavy hydrocarbon recovery with integration of turboexpander and JT valve from highly CO2-containing natural gas for gas transmission pipeline Yusupandi, Fauzi; Widiatmoko, Pramujo; Sukmana, Ira Febrianty; Fitri, Hera Rahma; Eviani, Mitra; Devianto, Hary
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.82485

Abstract

Demand of natural gas is predicted to increase since many valuable products can be produced. Water and heavy hydrocarbon content are the key for gas pipeline facility. To meet requirement of natural gas transportation, dehydration unit (DHU) and hydrocarbon dew point control unit (DPCU) are necessary to avoid water and hydrocarbon condensation during transmission. The conventional dehydration technology, TEG contactor, can lower water content from 1,304 mg/m3 to 80.35 mg/m3 where the maximum limit of water content in natural gas is 97 mg/m3 to prevent hydrate formation. DPCU is installed to remove heavy hydrocarbon, especially C5+. Integration of JT valve and turboexpander was employed to obtain the low gas dew point. The hot gas stream that entered the JT valve was observed. The lower hot bypass gas was applied, the lower hydrocarbon dew point and the more condensate flowrate was achieved. indohoki77 adalah salah satu platform judi online terkemuka yang menyediakan berbagai jenis permainan bagi para penggemar judi di Indonesia.The highest power generation can be gained at low hot gas flow ratio which also influenced the exit pressure and temperature of compressor. In pipeline simulation, the pressure and temperature drop occurred at the high hot gas rate. To examine the arrival condition, dew point curves were generated and showed that the limitation of hot gas flow ratio has to be below 0.6 to prevent heavy hydrocarbon condensation in pipeline.
Karakterisasi Fotokatalis Untuk Fotoreduksi Karbon Dioksida Menjadi Asam Format Dalam Fasa Akuatik Rizkiana, Jenny; Devianto, Hary; Soerawidjaja, Tatang Hernas
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-jen

Abstract

Photoreduction of carbon dioxide is one of the promising method to reduce green house gas emission. Carbon dioxide can be converted into organic chemical that has higher economic value by utilizing light energy. One of the favorable product is formic acid which is can be used as hydrogen-carrier. For this process, photocatalyst plays important role as it can increase the rate of reaction and as well as the selectivity as such more desirable product can be produced. The objective of present study is to develop photocatalyst which can significantly catalyze the photoreduction process of CO2 to form formic acid. Zinc titanate doped with aluminium is used as the base photocatalyst. Photoreduction process is held in room condition using three 2800 lm lamp. Qualitative analysis of the product is done by silver solid test and acidity test while quantitative analysis is done by High Performance Liquid Chromatography (HPLC) test. The silver solid test results confirm that formic acid is formed during process. Based on acidity profile data, anthocyanin as photosensitizer could increase higher acidity in the mixture than melanin. However, the concentration of formic acid in the solution is still very low so that it cannot be detected by HPLC.
Heavy hydrocarbon recovery with integration of turboexpander and JT valve from highly CO2-containing natural gas for gas transmission pipeline Yusupandi, Fauzi; Widiatmoko, Pramujo; Sukmana, Ira Febrianty; Fitri, Hera Rahma; Eviani, Mitra; Devianto, Hary
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.82485

Abstract

Demand of natural gas is predicted to increase since many valuable products can be produced. Water and heavy hydrocarbon content are the key for gas pipeline facility. To meet requirement of natural gas transportation, dehydration unit (DHU) and hydrocarbon dew point control unit (DPCU) are necessary to avoid water and hydrocarbon condensation during transmission. The conventional dehydration technology, TEG contactor, can lower water content from 1,304 mg/m3 to 80.35 mg/m3 where the maximum limit of water content in natural gas is 97 mg/m3 to prevent hydrate formation. DPCU is installed to remove heavy hydrocarbon, especially C5+. Integration of JT valve and turboexpander was employed to obtain the low gas dew point. The hot gas stream that entered the JT valve was observed. The lower hot bypass gas was applied, the lower hydrocarbon dew point and the more condensate flowrate was achieved. indohoki77 adalah salah satu platform judi online terkemuka yang menyediakan berbagai jenis permainan bagi para penggemar judi di Indonesia.The highest power generation can be gained at low hot gas flow ratio which also influenced the exit pressure and temperature of compressor. In pipeline simulation, the pressure and temperature drop occurred at the high hot gas rate. To examine the arrival condition, dew point curves were generated and showed that the limitation of hot gas flow ratio has to be below 0.6 to prevent heavy hydrocarbon condensation in pipeline.
Novel Study of Reaction Kinetics and Mass Transfer in Bioreactor Modelling: Prediction of Bioethanol Fermentation Performance by Saccharomyces cerevisiae on Continuous Fixed Bed Biofilm Plug Flow Reactor Aslan, Christian; Devianto, Hary; Wonoputri, Vita; Harimawan, Ardiyan
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 4 Year 2024 (December 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20230

Abstract

Bioethanol implementation as a renewable fuel has yielded economic, social, and environmental benefits, including reduced fossil fuel consumption, enhanced energy diversity and supply security, lower greenhouse gas emissions, and support for agricultural communities. These impacts underscore the importance of advancing innovation and optimizing processes to increase bioethanol production. Therefore, basic knowledge of chemical engineering in bioethanol fermentation is important to be learnt as a preliminary study, such as reaction kinetics and transport phenomena. This work studies the reaction kinetics and mass transfer in continuous fixed bed biofilm plug flow reactor modelling to predict anaerobic Saccharomyces cerevisiae fermentation performance, which is still not studied comprehensively. This modelling provides an overview of the influence of various independent variables, namely temperature, initial substrate concentration, cell concentration, superficial flow rate, reactor diameter, and solid particle diameter on various dependent variables, namely final product concentration, residence time, reactor length, reactor volume, product productivity, and pressure drop. The most sensitive parameters related to product productivity are temperature and cell concentration, so in its implementation, the temperature must be controlled at its optimum temperature, and the inoculum must be prepared with high cell concentration. For the next study, it is recommended to study the optimization of reactor design and operation (i.e. the pumping system, cooling system, and pH control of the reactor) and the implementation of the reactor on the plant scale. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Photoreduction of CO2 to Formic Acid in Aquatic Phase Using Layer Double Hydroxide (LDH) Catalyst Rizkiana, Jenny; Auliardi, Dzaky; Az Zahra, Aghietyas Choirun; Thadeo, Francesco; Saputera, Wibawa Hendra; Soerawidjaja, Tatang Hernas; Devianto, Hary
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 4 Year 2024 (December 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20199

Abstract

The increasing accumulation of CO2, the primary greenhouse gas (GHG), in the Earth's atmosphere has caused significant environmental problems and adverse climate change. Photoreduction offers promising method to convert CO2 into high value chemical compounds, such as formic acid, which can serve as a hydrogen carrier. The process of photoreduction efficiency can be enhanced by using photocatalyst capable of operating across two distinct photosystems each having a different spectrum based on the sensitivity of light. This study aims to investigate the impact of the photocatalyst preparation conditions on the activity of the resulting photocatalyst and identify which is the most effective one on the formic acid production. Photocatalysts based on Layered Double Hydroxide (LDH) composed of zinc and chromium was synthesized, resulting in Zn-Cr LDH, which was subsequently enhanced by incorporating Cu and Cu₂O. The operating temperature varied at 60 ℃ and 100 ℃. The highest yield of formic acid of 21,62 μmol.gcat-1.hr-1 was obtained at a reaction temperature of 100 ℃ using 0.3Cu@Zn-Cr LDH. This photocatalyst shows increased activity when the reaction temperature is increased to 60 ℃ and 100 ℃. In contrast, 0.3Cu2O@Zn-CrLDH showed a decreased activity at the elevated temperatures. This discrepancy attributed to the self-oxidation mechanism of Cu and Cu2O; while the oxidation of 0.3Cu@Zn-CrLDH results in Cu2O which retains photocatalytic activity, the oxidation of 0.3Cu2O@Zn-CrLDH leads to inactive CuO. This study provides valuable insight into the material design and demonstrates the potential of Cu-modified Zn-Cr LDH for sustainable CO2 reduction applications. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
The Study of Hydrothermal Carbonization and Activation Factors' Effect on Mesoporous Activated Carbon Production From Sargassum sp. Using a Multilevel Factorial Design Prakoso, Tirto; Rustamaji, Heri; Yonathan, Daniel; Devianto, Hary; Widiatmoko, Pramujo; Rizkiana, Jenny; Guan, Guoqing
Reaktor Volume 22 No.2 August 2022
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.22.2.59-69

Abstract

Seaweeds are large-scale multicellular marine algae categorized based on color as Chlorophyceae, Rhodophyceae, and Phaeophyceae. No information has been provided on the conditions affecting the production of mesoporous activated carbon from one member of the described aquatic plants, namely Sargassum sp. Therefore, this study aimed to determine the impact of the main factors and their interactions on Sargassum sp.-derived activated carbon manufactured (SAC) by hydrothermal carbonization and CO2 activation methods. A mathematical approach was employed using a multilevel factorial design with the main factors being the activator type (ZnCl2, CaCl2, & KOH), hydrothermal temperature (200, 225, & 250oC), and activator ratios (2 & 4). Meanwhile, the response variables were yield and BET surface area (SBET) of SAC. Morphological, functional, crystallographic, and porosity characterization was carried out on the samples. The SAC-Ca-200-2 sample had the highest yield, with the value being 26.5 percent of weight. The activators having the highest specific surface area (SBET) were SAC-Zn-250-4, SAC-Ca-225-2, and SAC-K-250-2, with 1552, 1368, and 1799 m2/g, respectively. The pore size distribution in SAC products ranged from 2.16 to 10 nm in diameter. The analysis conducted indicated the activator type and interaction with its ratio substantially impacted the SAC yield value; besides, only the activator type affects the formation of high surface area pores.
Co-Authors Aditya Farhan Arif Adriaan Adriaan Adriaan Adriaan Adriaan, Adriaan Aghietyas Choirun Az Zahra Aida Nur Ramadhani Al-Aziz, Rd. Habib R. M. T. Ananda, Wisnu Anastasia Yuandy Anies Mutiari Anna Sonya Asoka Ardiyan Harimawan Ardiyan Harimawan Aslan, Christian Auliardi, Dzaky Bork Ilsemann Dadan Kusdiana Daniel Yonathan, Daniel DARMANSYAH . Dian Shofinita Dicky Tri Jatmiko Eviani, Mitra Fauzi Yusupandi Febriyanto, Pramahadi Ferdyan Ihza Akbar Fitri, Hera Rahma Gatalie, Kreszen Livianus Guan, Guoqing Harimawan, Ardiyan Henry Natanail Purwito Heri Rustamaji Hilham Zamriko Koto Ignatius Chandra Kurniawan Ilsemann, Bork Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin James B. Winterburn Jerry Jerry Josephine Christine Utomo Khodiyat, Nicholas Koto, Hilham Zamriko Listiani Artha Melanie, Susiana Mhd Ridho Utomo Mike Reich Mitra Eviani Muhammad Mara Ikhsan Mutiari, Anies Nurdin, Isdiriayani Nurdin, Isdiriayani Pramahadi Febriyanto Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pusparizkita, Yustina Metanoia Rd. Habib R. M. T. Al-Aziz Reich, Mike Rendy Rendy Ridho Eka Yandra Rizkiana, Jenny Rizky Eka Ahmad Saputera, Wibawa Hendra Satria, Arysca Wisnu Schmahl, Wolfgang Setiadi, Tjandra Shofinita, Dian Simparmin br Ginting Sukmana, Ira Febrianty Sung Pil Yoon Susiana Melanie Tae-Hoon Lim Tatang Hernas Soerawidjaja Tatto Bustomi Thadeo, Francesco Tiara Calista Shandy Tirto Prakoso Tirto Prakoso Utomo, Mhd Ridho Vita Wonoputri Widiatmoko, Pramujo Winterburn, James B. Wisnu Ananda Wolfgang Schmahl Yandra, Ridho Eka Yustina Metanoia Pusparizkita Yusupandi, Fauzi