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Tailoring acid-base properties on metal-free zeolite from Indonesia kaolin to enhance the CO₂ hydrogenation to CH₄

Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Sholeha, Novia Amalia Dewanto, Bintang Jovita, Stella Nugraha, Reva Edra Taufiq-Yap, Yun Hin Ulfa, Maria Fauzi, Anees Ameera Jalil, Aishah Abdul Bahruji, Hasliza Prasetyoko, Didik College of Vocational Studies Bogor Agricultural University (IPB University) Jalan Kumbang No. 14 Bogor 16151 Indonesia Department of Chemistry Faculty of Science Institut Teknologi Sepuluh Nopember Keputih Sukolilo Surabaya 60111 Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Pembangunan Nasional “Veteran” Jawa Timur Surabaya 60294 Indonesia Department of Chemistry Faculty of Science Universiti Putra Malaysia Serdang Selangor Malaysia Chemistry Education Study Program Faculty of Teacher Training and Education Sebelas Maret University Jl. Ir. Sutami 36A Surakarta 57126 Indonesia Research Center for Biomass and Bioproduct National Research and Innovation Agency (BRIN) Indonesia Department of Chemical Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia UTM Skudai Johor Johor Bahru 81310 Malaysia Centre of Hydrogen Energy Institute of Future Energy Universiti Teknologi Malaysia UTM Skudai Johor Johor Bahru 81310 Malaysia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Darussalam

The catalytic thermal conversion of carbon dioxide is essential for carbon capture, storage, and utilization, helping to reduce CO2 emissions and potentially stimulating future economic activities. Zeolite Y, ZSM-5, B... 详细信息

The catalytic thermal conversion of carbon dioxide is essential for carbon capture, storage, and utilization, helping to reduce CO₂ emissions and potentially stimulating future economic activities. Zeolite Y, ZSM-5, BEA, and A were synthesized using the hydrothermal technique from Indonesian kaolin to examine the potential use of zeolite as a catalyst without metal nanoparticles. In the absence of metal, catalytic activity for CO₂ methanation relies solely on textural properties and basicity-acidity. Zeolite Y exhibits the highest CO₂ conversion at 36.64 % and attained 100 % of CH₄ selectivity at 400 °C. The exceptional CO₂ conversion of zeolite Y relies on a high basicity level of 1.02 mmol/g, as shown by CO₂-TPD analysis, and a relatively low acid site concentration of 1.48 mmol/g, as determined by NH₃-TPD analysis. ZSM-5, BEA, and zeolite A, demonstrated CO₂ conversion of 29.85 %, 23.86 %, and 12.15 %, respectively. Stability studies revealed ZSM-5 maintains methane (CH₄) selectivity of 94 %, which is only slightly lowered by 6 % for 30 hours, while zeolite Y achieved 90 % selectivity for 26 hours. The presence of mesopores in zeolite ZSM-5 reduced coke or carbon production, maintaining crystalline framework. © 2024 The Authors

关键词： Basicity Greenhouse carbon dioxide Metal free catalyst Methane Zeolite

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Evaluating the impacts of environmental and human health of the critical minerals mining and processing industries in Indonesia using life cycle assessment

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Wahyono, Yoyon Sasongko, Nugroho Adi Trench, Allan Anda, Martin Hadiyanto, Hadiyanto Aisyah, Nyayu Anisah, Anisah Ariyanto, Novy Kumalasari, Isnaeni Putri, Virny Zasyana Eka Lestari, Mutia Citrawati Panggabean, Lambas Parlaungan Ridlo, Rohmadi Sundari, Sundari Suryaningtyas, Anissa Dewi Novianti, Endah Dwi Hakim, Muhammad Raihan Farras Prihatin, Anggara Lomak Matin, Hashfi Hawali Abdul Research Center for Sustainable Production System and Life Cycle Assessment National Research and Innovation Agency - BRIN Prof. BJ. Habibie Complex Area Banten Tangerang Selatan 15314 Indonesia Energy Security Graduate Program Republic of Indonesia Defense University IPSC Sentul Area West Java 16810 Indonesia Centre for Exploration Targeting School of Earth Sciences The University of Western Australia 35 Stirling Highway Crawley 6009 WA Australia UWA Business School 35 Stirling Highway Crawley 6009 WA Australia Environmental Engineering Murdoch University Murdoch 6150 WA Australia Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Central Java Semarang 50241 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Central Java Semarang 50275 Indonesia Department of Mechanical Engineering Vocational School Gadjah Mada University Sleman Yogyakarya 55281 Indonesia Study Program of Environmental Science Faculty of Mathematics and Natural Science Universitas Sebelas Maret Central Java Surakarta 57126 Indonesia

The critical minerals industries in Indonesia may pose possible environmental and human health risks due to the release of pollutants into soil, water, and air, as well as the use of materials and energy. This study investigates the possible environmental and human health impacts of Indonesia's nickel, gold, copper, tin, and bauxite mining and processing industries. This study utilizes the latest version of the OpenLCA software, version 2.0, in combination with the Ecoinvent 3.8 database. To evaluate potential environmental consequences and health effects on humans, CML-IA Baseline and Environmental Priority Strategies (EPS) are employed in product development. The EPS system was developed utilizing a hierarchical methodology with the objective of furnishing the product developer with data regarding the financial impact of human health impairment resulting from a particular product development. The production of one tonne of gold, nickel, bauxite, tin, and copper results in the emission of 7.34.E+07, 4.61.E+04, 3.10.E+04, 1.02.E+04, 8.01.E+03 kg CO₂ eq/t, respectively, contributing to global warming. This production is associated with asthma cases of 7.79.E+01 (gold industry), 2.21.E−03 (copper industry), 1.81.E−03 (tin industry), 9.21.E−04 (nickel industry), and 4.71.E−06 (bauxite industry) Personyears/t. Electricity consumption and the release of carbon dioxide are the main factors contributing to global warming. The primary cause of asthma cases is the utilization of fuel oil and electricity. Power plant chimneys can employ various technologies, such as cyclones, bag filters, and scrubbers, to mitigate the release of polluting gas emissions. The critical mineral industry must prioritize handling and governing of steam power facilities to minimize their negative effects on the environment and human health. © 2024 The Authors

关键词： Critical minerals industries Environmental impacts Human health impacts Life cycle assessment

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Mathematical Model of Traffic Speed and Capacity in the Archipelago Base

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IOP Conference Series: Materials Science and engineering 2021年第1期1125卷

作者： A. Gaus T. Y. S. Muhammad U. S. H. Ambo N. Liska Civil Engineering Study Program Faculty of Engineering Universitas Khairun

The transportation engineering developing who the application of the principal use planning, analysis and design to the disciplines comprising transportation: its vehicles, physical infrastructure, safety in travel, environment impacts and energy usage. The mathematical model in base archipelago was not much enough to research by transportation practiced. It had been of characteristic which different mainland. This paper using greenshields and greenberg models for approach real condition of the base archipelago. In the transportation involves working with the businessman, with industry, with citizen group, with elected officials, and with employes to the joint each segment of the public strip depended on at least one constructed facility. In this time there three components that included the discussion of the traffic of a microscop scale were flow, density and speed. At the greenshields model, the speed-density relationship show whose the value of speed higher than value of density lower with determination value 0,9755 where the curve of flow-density relationship show the value determination 0,8634 and for curva of flow-speed relationship showing whose maximum value of flow 1807 vehicles/hour at the value traffic speed 46 km/hour, traffic speed which at the lower or it the higher, so it condition given impact that the value of flow will going to low. on the other hand for greenberg model at speed-density relationship's determination 0,9463, density-flow relationship show that the value minimum of density is 25 vehicles/km while value of flow is 1400 vehicles/hour and the relationship between flow-speed curve show that value maximum flow 1750 vehicles/hour with value speed 37. Base the value of each condition, so the greenshields model was better than greenberg model for this research. The mathematical model of the traffic flow which approach the real condition for the base archipelago was greenshields model.

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Improving the environmental performance of palm oil industry through the utilization of empty oil palm bunches as organic fertilizer and biochar for soil amendment

Environmental Challenges

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Environmental Challenges 2025年 20卷

作者： Faradillah Raynita Yusuf Suprihatin Suprihatin Nastiti Siswi Indrasti Agroindustrial Engineering Study Program of Graduate School IPB University Bogor West Java 16680 Indonesia Department of Agroindustrial Technology Faculty of Agricultural Technology IPB University Bogor West Java 16680 Indonesia

The palm oil industry plays a very important role in the Indonesian economy, as it contributes significantly to state revenue and employment. However, this industry also faces serious challenges related to its environmental impacts. Intensive crude palm oil (CPO) produces various forms of waste in large quantities, such as solid, gas, and liquid waste, which pollute the environment if not managed properly. One of the main wastes from the CPO industry is empty fruit bunches (EFB), which amount to around 23–28 % of the fresh fruit processed. This study aims to analyze the environmental impacts of palm oil mills using the Life Cycle Assessment (LCA) approach and evaluate the potential for improvements by utilizing EFB as base material for organic fertilizer and biochar as a soil amendment. The research was conducted at three palm oil mills in Indonesia. Data processing uses OpenLCA software version 2.3 combined with the Ecoinvent 3.9.1 database. The results of the study indicate that the largest source of greenhouse gas emissions comes from the use of synthetic fertilizers. The use of synthetic fertilizers can be reduced significantly by applying organic fertilizers and biochar produced from EFB. On average, the use of synthetic fertilizers per hectare can be reduced by using organic fertilizers or biochar by approximately 75.27 % and 34.85 % respectively. As a result, synthetic fertilizer input costs and the greenhouse gas emissions can be reduced.

关键词： Biochar Environment impacts Life cycle assessment Organic fertilizer Palm oil mill Soil amendment

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Reclaiming Resources from Disposable Diapers: Closing the Loop with Hydrothermal Carbonization and Water Reuse

SSRN

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SSRN 2024年

作者： Djaenudin Putra, Herlian Eriska Muchlis Wresta, Arini Indriati, Lies Sintawardani, Neni Fitria, Novi Hamidah, Umi Purwanta, Wahyu Permana, Dani Setiawan, Arief Ameir Rahman Putri, Ganiz Amaranthi Nilawati, Dewi Widyarani KST Dr. Samaun Samadikun Jalan Sangkuriang No. 21 D Bandung40135 Indonesia Collaborative Research Center for Zero Waste and Sustainability Jl. Kalijudan No. 37 Surabaya60114 Indonesia Department of Chemistry Sekolah Tinggi Analis Bakti Asih Bandung40192 Indonesia Jalan Raya Jakarta-Bogor KM. 46 Cibinong Bogor16911 Indonesia Selatan Tangerang15314 Indonesia Environmental Engineering Study Program Faculty of Civil Engineering and Planning Institut Teknologi Nasional Jalan P. H. H. Mustofa No. 23 Bandung40124 Indonesia

Disposable diapers have become an overwhelming component of municipal waste streams, exemplified by Bandung's staggering daily influx of approximately 1,451,024 diapers into landfills in 2021. Hydrothermal carbonization (HTC) emerges as a potential solution for the valorization of this problematic waste, transforming it into hydrochar, a key ingredient for environmentally-conscious briquettes. However, HTC's reliance on substantial water resources underscores the urgent need for efficiency strategies. This study investigates water recirculation as a strategy to promote resource conservation within HTC while processing disposable diapers. Key process parameters—temperature (200–250 °C), residence time (15–45 minutes), and single-pass recirculation—were systematically varied to assess their impact on hydrochar characteristics. Results demonstrate that higher temperatures, longer residence times, and recirculation can enhance hydrochar heating value and energy densification ratio, albeit with yield and energy yield trade-offs. The highest values for yield (20.88%), calorific value (8,247.57 cal/g), energy densification ratio (1.359), and energy yield (25.08%) were obtained under specific conditions. © 2024, The Authors. All rights reserved.

关键词： Water conservation

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Reconstructing past landslide models based on subsurface resistivity profiles: Case study from Majene West Sulawesi 1

Reconstructing past landslide models based on subsurface res...

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1st International Conference on Geoscience, ICoGeS 2018

作者： Arsyad, Ardy Aswad, Sabrianto Syamsuddin, Erfan Department of Civil Engineering Faculty of Engineering Hasanuddin University Makassar Indonesia Study Program of Geophysics Faculty of Mathematics and Natural Science Hasanuddin University Makassar Indonesia

This paper presents a case study of reconstructing past landslide failure models in a napal geological formation by undertaking a series of geoelectrical tomographies and geotechnical bor-SPT surveys. study area is located in the National Artery Road 135 Kilometres, Majene-Mamuju, West Sulawesi. Geological formation found in the area is Napal Pambauang Formation. Massive ground movement is obviously detected in the area, and several landslide events have been occured in the last 10 years. In order to derive an effective technnique of mitigating the landslide in the area, past landslide failure models are needed to reconstruct. Therefore, 2D geoelectric tomographies survey combined several geotechnical bors were undertaken. A Framework of geophysics and geotechnical investigations was developed and implemented. The results show that slope failure models can be mapped, following unique patterns in the subsurface resistivity models. The finding slope failure models are well agreement with successive scarp patterns founded in the slope area. Past and recent landslides and future landslide are derived and this can be employed to design effective landslide mitigation strategies. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Landslides

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X-ray application of micro-computed tomography for biological sample test

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AIP Conference Proceedings 2023年第1期2614卷

作者： Susilo Yuni Wijayanti Fitria Azmi Rudi Setiawan Ulil Albab Taufiq Ian Yulianti Physics Department Faculty of Mathematics and Natural Sciences Universitas Negeri Semarang Semarang Indonesia Public Health Study Program Universitas Negeri Semarang Semarang Indonesia Radiodiagnostic Engineering and Radiotherapy Study Program STIKES An Nasher Cirebon Indonesia Faculty of Science and Mathematics Universitas Diponegoro Semarang Indonesia

Homemade micro-CT equipment has been successfully developed in the Physics Laboratory of Universitas Negeri Semarang (UNNES). The micro-CT was tested and could be used properly for non-destructive testing (NDT) using a phantom as the object. However, the application of the micro-CT for biological samples has not been investigated. Therefore, in this work, an investigation of the homemade micro-CT for biological samples was done. Tilapia fish was used an object. The fish was exposed to the X-ray using exposure factors of 45 kV, 32 mA, and 0.08 s. The object was rotated with rotation angle range of 0°-360° with increment of 1.40625° and the images at every rotation angle increment was recorded. The three-dimensional (3D) image was then reconstructed from the collection of the two-dimensional (2D) images obtained during rotation. The quality of the images was then analyzed using contrast to noise ratio method (CNR). The results showed that the highest CNR was obtained at the image taken with rotation angle of 315° which was 81.163. Therefore, it can be concluded that the homemade micro-CT equipment could be used for biological sample and can be further applied in other applications such as CT-scan.

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Single cell protein production by a local Aspergillus niger in solid state fermentation using rice straw pulp as carbon source: Effects of fermentation variables 1

Single cell protein production by a local Aspergillus niger ...

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1st International Symposium of Indonesian Chemical engineering, ISIChem 2018

作者： Said, S.D. Zaki, M. Asnawi, T.M. Novita, E. Chemical Engineering Department Faculty of Engineering Syiah Kuala University Darussalam Banda Aceh Indonesia Chemical Engineering Graduate Study Program Faculty of Engineering Syiah Kuala University Darussalam Banda Aceh Indonesia

In this study, solid-state fermentation was carried out to produce single cell protein by local Aspergillus niger. Rice straw pulp produced from the pretreatment by liquid hot water at temperature 121 °C for 60 minutes of cooking time was used as carbon source. The effects of nitrogen sources, initial medium pH, C/N ratios of substrates and fermentation time on SCP production were evaluated in these experiments. The single cell protein was measured as crude protein content in the fermentation product by the Kjeldahl analysis method. The maximum crude protein of 18.9 % (w/w) contained in the fermentation product occurred at the fermentation condition with C/N ratio 30:1, the initial medium pH 4, temperature 30 °C, moisture content 75 % and relative humidity 95 %. © Published under licence by IOP Publishing Ltd.

关键词： Carbon

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Power Transfer Analysis Using UPQC-PV System Under Sag and Interruption With Variable Irradiance

Power Transfer Analysis Using UPQC-PV System Under Sag and I...

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Smart Technology and Applications (ICoSTA), 2020 International Conference on

作者： Amirullah Adi Soeprijanto Adiananda Ontoseno Penangsang Electrical Engineering Study Program Faculty of Engineering Universitas Bhayangkara Surabaya Surabaya Indonesia Department of Electrical Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia

ISBN: (数字)9781728130835

ISBN: (纸本)9781728130842

This paper presents an analysis of the Unified Power Quality Conditioner-Photovoltaic (UPQC-PV) system under sag and interruption voltage with variable irradiance. The PV is connected to a three-phase three-wire (3P3W) distribution system with 380 volts (L-L) and a frequency of 50 hertz, through UPQC-DC link. This system is used to maintain and supply sensitive loads. This paper shows that in the sag voltage and irradiance levels of 200 W/m 2 to 1200 W/m 2 , the 3P3W system uses UPQC-PV with proportional-integral (PI) still able to maintain the active load power above 3714 W. However, in the interruption voltage and same irradiance level, the load active power drops to between 2560 W and 2805 W. This research also shows that in the sag voltage and same irradiance levels, the 3P3W system uses UPQC-PV with PI still able to generate PV power between 500 W to 920 W. In the interruption voltage and same irradiance levels, the power that can be generated by PV increases between 1300 W to 1635 W. Otherwise, at 25 0 C and 1000 W/m 2 , the increase in PV power on interruption voltage has not been able to meet the load active power consumption, so it finally drops to 2650 W. This paper is simulated using Matlab/Simulink.

关键词： UPQC Photovoltaic Sag Interruption Irradiance interruption irradiance interrupters PHOTOVOLTAIC Tungsten Light intensity Polydnaviridae VOLTAGE

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Comparison design of electric motorcycles using hybrid systems (BLDC motor) on 150Cc motorcycles based on parameter testing

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AIP Conference Proceedings 2023年第1期2592卷

作者： Pawenary S. Azzahra Hastuti Azis H. Andre A. S. Prabuwono Electrical Technology Study Program Faculty of Electricity and Renewable Energy PLN Institute of Technology Jakarta Indonesia Department of Electrical Engineering Faculty of Engineering Universitas Andalas Padang Indonesia Rabigh Faculty of Computer and Information Technology (FCITR) King Abdulaziz University Jeddah Saudi Arabiaa

This study aims to know the comparison design of electric motorcycle using hybrid systems (BLDC Motor) based on parameter testing, i.e., with and without load. The design of electric motorcycles is centered on determining a feasibility study comparing engine drive with electric drive. Electric vehicles are the answer to decreasing petroleum supplies and environmental concerns that are worsening every year due to oil-fueled cars’ exhaust emissions. The proportion of motor vehicle exhaust as an air pollution source is between 60 and 70 percent. The global decrease of fossil fuels is also a critical issue that has yet to be handled. A descriptive statistic methodology was employed in this work as an analytical tool. The results showed when the speed increases, the efficiency of the BLDC motor would increase; this is, of course, following the principle of Orsted’s law and Lorentz force. When compared to the no-load test, the efficiency by using the load will be greater because when the BLDC motor works with a load, it will require greater torque due to an increase in load so that it takes a large amount of power so that it will increase the efficiency of the BLDC motor. When compared in terms of using the battery, the time of using the battery with no load will be longer because it does not require too much current.

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