Muhammad Aziz

The University of Tokyo | Todai · Institute of Industrial Science

The multi-distributed activation energy model (multi-DAEM) is the most effective approach for outlining the kinetics model of biomass pyrolysis. The purpose of this study is to identify the optimal number and shape of the DAEM for sugarcane bagasse pyrolysis and to discuss its thermodynamic characteristics using the combination of multi-DAEM and di...

Numerous concerns, including environmental impact and public health issues, drive the urgent need to replace nonrenewable fossil fuels with renewable energy sources, with biomass emerging as a viable alternative globally. In this comprehensive review, the urgent need to transition from nonrenewable fossil fuels to renewable energy sources is addres...

The investigation into reaction kinetics provides fundamental insights for reactor design in biomass thermo-chemical conversion. This work studied the kinetics of biomass chemical looping process based on a multi-step model. Cellulose, xylan, and lignin were employed as biomass representatives. The individual step in the multi-step scheme was formu...

This research was conducted to determine (i) the growth in the number of scientific publications in the field of particle technology in computational fluid dynamics (CFD), (ii) top citations based on the number of citations, publisher, and country, (iii) visualization of the most productive author, and (iv) publication development map based on keyw...

In recent years, the Internet of Things (IoT) trend has been adopted very quickly. The rapid growth of IoT has increased the need for physical access control systems (ACS) for IoT devices, especially for IoT devices containing confidential data or other potential security risks. This research focused on many-to-many ACS, a type of ACS in which many...

In the context of carbon neutrality, multi-energy systems are being designed to enhance the integration of renewable energy, and the deployment of large-scale energy storage solutions is vital to ensure a flexible and cost-effective system operation. Hydrogen and ammonia are two promising energy carriers that can serve as storage media, feedstock,...

Biodiesel, a promising eco-friendly alternative to diesel, faces a major obstacle in the form of high feedstock costs (50%–70%) for production. Sewage sludge (SS) as a viable feedstock for biodiesel production was recognized due to its abundance, consistent availability, and low cost. However, certain limitations, such as pretreatment and drying, a...

A solar water heater (SWH) converts solar radiation into thermal energy for various purposes, and its technology has experienced numerous developments. Many studies have focused on developing, optimizing, and analyzing the technological configurations of SWH to improve its thermal efficiency, but they rarely achieve 80% efficiency. This review aims...

In order to reduce the reliance on fossil fuels, woody biomass has been considered as a potential co-firing fuel in coal-fired power plants. However, there is a scarcity of comprehensive studies on the impact of high alkali and alkaline earth metal content in woody biomass, which can trigger ash-related problems. This study aims to address this res...

Water hyacinth (Eichhornia crassipes) is considered a prospective free-floating aquatic plant potentially used to address current issues on food, energy, and the environment. It can grow quickly and easily in various tropical and subtropical environments as long as it has access to adequate light and water to support photosynthetic growth. Ecosyste...

h i g h l i g h t s Comparative study of H 2 and NH 3 impact on n-Hexadecane flame. Premixed flow flame and diffusion counterflow and coflow flames studied. Combustion species along with PAH and NOx species were discussed. Soot surface equations along with Moss-Brookes model were used. Results suggest H 2 ! 70% and NH 3 70% should be used in n-Hexa...

Developing an efficient and environment-friendly route for waste valorization is extremely significant in accelerating the transition toward a circular economy. A novel waste-to-synthetic natural gas (SNG) conversion process comprising hybrid renewable energy systems is proposed for this purpose. This includes thermochemical waste conversion and po...

Biomass has the potential to cause slagging and fouling during combustion due to its high potassium and high chlorine contents, as well as its low ash melting temperature. This study aims to identify suitable additives for co-firing of coal with palm oil waste. Magnesium, aluminosilicate, aluminum, silicate, calcium, and potassium-based additives w...

Despite the growing sales of electric vehicles and electrification as a means to alleviate the growing problem of climate change, it is largely overlooked that internal combustion engine-driven vehicles still account for 99.8% of the global transportation fleet. These vehicles pose a significant demand for liquid fuels, which is typically met by fo...

Biomass serves as an alternative energy solution for decarbonizing coal-fired power plants, which have been reactivated in several countries due to the global energy crisis. Oil palm waste, owing to its abundant availability, holds significant potential as a biomass fuel. This study aimed to investigate the combustion performance of various oil pal...

Carbon capture and storage (CCS) is considered as a solution for achieving CO2 emission reduction targets in Indonesia. On a commercial scale, geological carbon storage (GCS) systems have significant capital costs and energy penalties that the production of geothermal energy could somewhat compensate it. Coupling geothermal energy and geologic CO2...

The transformation from a fossil fuels economy to a low carbon economy reshapes how energy is transmitted. Since most renewable energy is harvested in the form of electricity, hydrogen obtained from water electrolysis using green electricity is considered a promising energy vector. However, the storage and transportation of hydrogen at large scales...

Nowadays, the use of microalgae biomass is evolving rapidly for their various applications such as food, pharmaceutical, and cosmetics. One of the essential compounds in microalgae that have good perspectives in the market is pigment since it can be used as a natural colorant in food or cosmetics. However, the extraction of bio-pigments from the gr...

Wallacea attracts much attention from researchers because it is a meeting point between Asia and Australia with rich biodiversity. Therefore, bioenergy source identification in this region is crucial to better understanding biomass potential and utilization. On the other hand, national bioenergy development usually refers to government policies, in...

Coal is the primary fuel for most Indonesian power plants, causing high CO2 emissions. Since the Paris Agreement prioritizes efforts to reduce CO2 emissions, power generation companies have put great efforts into demonstrating co-firing of coal with biomass. This research is the first study to examine the synergistic effect of combining coal and so...

Soot and carbon dioxide released from internal combustion engines became the key issues when using fossil fuels. The use of zero-carbon fuel, hydrogen, with hydrocarbon fuels can play an important role in reducing the exhaust effect on the environment and mitigating the reliance on nonrenewable energy resources. A numerical approach was executed to...

div class="section abstract"> Soot and carbon dioxide released from internal combustion engines became the key issues when using fossil fuels. The use of zero-carbon fuel, ammonia, with hydrocarbon fuels may play an important role in reducing the exhaust effect on the environment and mitigating the reliance on nonrenewable energy resources. However...

div class="section abstract"> Lean combustion is an approach to achieving higher thermal efficiency for spark ignition engines. However, it faces low burning velocity and unstable combustion problems near the lean flammability limits region. The current work is attempting to investigate the combustion characteristics of iso-octane flame with 0% and...

Four machine learning (ML) models including a deep neural network, a long short‐term memory network, a random forest (RF), and an extreme gradient boosting are implemented to predict CO–NOx emissions from a natural gas power plant. A new feature optimization scheme (FOS) via a sequencing process of feature selection and hyperparameter optimization...

Biomass waste can be utilized as a mixed co-firing fuel in power plants to reduce net carbon emissions. However, understanding the characteristics of biomass and its blend before being applied to actual power plants is required. Adding biomass to the existing power plant fuel may cause problems such as slagging and fouling due to ash deposits, affe...

Indonesian coal reserves are dominated by medium and low-rank coals. Despite being economically profitable, low-quality coals can trigger ash-related problems in a boiler, such as slagging and fouling. Suitable additives can be useful to overcome the issue of high-alkali coals. The main objective of this study is to determine the effectiveness of t...

Efficient CO2 utilization in the thermochemical conversion of biomass plays an important role in creating a future low-carbon economy. This study attempts to explore the CO2-assisted chemical looping gasification and co-gasification process of lignocellulosic biomass components (hemicellulose, cellulose, and lignin) with iron oxide oxygen carriers...

Heat transfer augmentation of turbulent single-phase flow in a concentric tube heat exchanger with short-length twisted tape inserts was numerically examined herein. The twisted tape length ratios were 0.25, 0.5, 0.75, and 1.0. The twisted tape was comprised of an aluminum strip with a constant thickness, a pitch, and a width of 0.7, 35, and 12.6 m...

Enhancing heat transfer performance has been the main interest in the thermal engineering field. Various enhancement methods have been proposed, including twisted and Multilobe tubes. Nevertheless, no study investigating the enhancement by combining both strategies has been reported. This study is thus conducted to numerically evaluate the turbulen...

Biomass tar is an unavoidable side product in the biomass direct chemical looping process. It is necessary to eliminate tar as it may cause operational problems, such as fouling and blocking in the downstream equipment. Innovative in-situ tar removal through oxidation and catalysis of oxygen carrier is attractive because it can decrease the decompo...

With the passing of every second we get closer to a society that is more cognizant of the effect carbon dioxide emissions are having on our planet, and that is more willing to take part in sustainable efforts to combat this and ever more interested in investing in cleaner technologies like electric vehicles (EVs). EVs are marching strongly into a m...

One of the biggest issues impeding a country’s progress is the lack of power. To overcome this issue, hybrid renewable energy systems (HRES) play an important role. Due to rising consumption and diminishing resources globally, sustainability has recently attracted more attention. Bangladesh has access to renewable energy sources, including solar, m...

Green hydrogen is suitable for grid-scale energy storage to increase the penetration of renewable energy, and it is also an alternative to fossil fuels. However, it still suffers from storage problems owing to its low volumetric energy density, embrittlement, and very low boiling point. To improve safety and reduce cost, green ammonia has been prop...

The battery monitoring system (BMoS) is crucial to monitor the condition of the battery in supplying and absorbing the energy when operating and simultaneously determine the optimal limits for achieving long battery life. All of this can be done by measuring the battery parameters and increasing the state of charge (SoC) and the state of health (So...

This study aims to propose a new process design, simulation, and techno-economic analysis of an integrated process plant that produces glucose and furfural from palm oil empty fruit bunches (EFB). In this work, an Aspen Plus-based simulation has been established to develop a process flow diagram of co-production of glucose and furfural along with t...

This chapter describes the energy conversion and balance performed in a battery electric vehicle. Such information is essential to investigate the energy consumption, including determining the battery capacity as primary energy storage. The mechanical and electrical power flows in the vehicle are also discussed here. Driving cycles described as spe...

Implementing a co-combustion technology in coal-fired plants using biomass waste is a promising option to alleviate environmental pollution, reduce fuel costs, and minimize waste. The considerable potential of palm oil waste is believed to be able to substitute coal as a raw material in a coal-fired power plant. However, since each coal has differe...

In the last decades of electric vehicle (EV) development, battery thermal management has become one of the remaining issues that must be appropriately handled to ensure robust EV design. Starting from researching safer and more durable battery cells that can resist thermal exposure, battery packing design has also become important to avoid thermal...

Metal hydride (MH) shows high effectiveness in storing hydrogen due to its relatively low temperature, low- pressure, and high volumetric hydrogen density. However, it also has been reported that its gravimetric density is low due to the weight of the MH itself. It has been shown that the MH reactor is not suitable for mobile application unless its...

Photoelectrochemical water splitting (PEC-WS) is an interesting method to produce hydrogen from water by directly utilizing photon energy from the sunlight. Zinc oxide (ZnO) plays a crucial role as the photoanode in this system. ZnO with a certain nanostructure type has been reported to give distinctive results over other types when implemented as...

Because of their compact structure, ease of processing and higher heat transfer coefficient, curved-tube heat exchangers are widely applied in various industry applications, such as nuclear power systems, solar-powered engineering, aircraft engine cooling systems and refrigeration and cryogenic systems. Accurate knowledge about the heat transfer ch...

In this research, a novel integrated methanol and ammonia production via chemical looping is developed utilizing the separated biochar and pyrolysis gas from fast pyrolysis unit. The proposed system uses biomass as a feedstock due to its huge global potential. Process modelling and evaluation are conducted using a steady-state process simulator. Th...

To achieve carbon neutrality in the future, the penetration of renewables requires further improvement with the help of energy storage technology. Green hydrogen and green ammonia have been recognized as the optimal candidate for grid-scale energy storage. Except for water electrolysis, biomass chemical looping technology is another clean hydrogen...

The use of solar energy as a source of electrical power is done by utilizing solar panels. Even though the sun has two sources of energy: light energy and heat energy, however, up to now, the heat energy generated by the sun is not yet fully utilized. This study was aimed to develop floating -on water- power plant where the temperature difference t...

Cofiring coal with various biomasses has received much attention due to environmental factors and is considered a low-cost option. Although cofiring coal with biomass seems feasible, it potentially produces ash, which causes issues in boilers, such as fouling and slagging. This paper comprehensively investigates combustion performances and slagging...

Hydrothermal process is an eco-friendly method for simultaneously extracting antioxidant compounds and producing hydrochar. This study examined the simultaneous production of nutritional compounds and hydrochar from Chlorella pyrenoidosa via a hydrothermal process. The experiments were conducted using a batch reactor at varying temperatures (160, 1...

Metal hydrides (MHs) are highly effective for storing hydrogen because of their stability, relatively low temperature and pressure, and high volumetric hydrogen density. However, their gravimetric density is low because of the weights of the MHs, leading to a low potential for mobility applications unless the reactor also acts as a body frame, ther...

Sophisticated gradient designs in natural materials are usually desired in man-made cellular materials with the aim to achieve multifunction and improve structural performance. However, many natural structures are still difficult to mimic due to their complex gradient designs. In this paper, a novel design strategy is proposed for generating multi-...

Liquid piston Stirling engine, also known as the Fluidyne engine, has been an active subject of research due to its possible integration with renewable energy technologies, like solar energy, providing a sustainable and renewable source for water pumping. Extensive research has been done on the Fluidyne engine, and previous researchers have come up...

Mechanical damages in solid electrolytes of solid-state battery (SSB) during the charging-discharging process remain a challenging issue for battery implementation. This paper demonstrates a numerical simulation of the damages in Li10GeP2S12 (LGPS) solid electrolyte of SSB due to compressive loading generated by electrode volume changes. Three mode...

In the energy system transition, energy storage technology is vital for increasing the penetration of renewables, where chemical energy storage is most suitable for long-term grid-scale energy storage. Green ammonia is selected to replace hydrogen for the sake of storage efficiency, safety, and cost. Most time, ammonia is seen as either an energy s...

Nusselt number (Nu), friction factor (f), and thermal performance factor (η) are effective thermal parameters in determining the robustness of thermal management systems. However, a precise prediction of these parameters is a challenge due to complicated fluid and thermal behaviors of thermal systems, such as heat exchangers. In this study, we prop...

Chemical looping hydrogen production (CLH2) is a new technology used to produce hydrogen (H2) from fuels while separating CO2 simultaneously. This research aims to build an integrated conversion system of rice husks, a high energy potential biomass, to H2 with high energy efficiency. The developed system mainly consists of superheated steam drying,...

A new layout to indirectly couple solar energy with biomass chemical looping gasification is proposed; • The proposed system can circumvent the fluctuating working condition of CLG and downstream processes; • Efficient thermal recovery of the solid particles is easier to be fulfilled for the proposed system; • The present configuration based methan...

This paper reveals the stability characteristics of an electric-powered delta trike (e-trike), which is developed for goods delivery services. The changeable center of gravity position and weight due to electric component placement and the carried good weight can cause instability of the e-trike. Three main parameters are firstly evaluated on the e...

Rice wastes are one of the high potential biomasses due to their large capacity and distribution throughout the world. Harvesting the energy from those rice wastes, including rice husk and straw, is considered clean, sustainable, and economical. Among various energy conversion technologies, gasification is considered a promising technology to conve...

Growing attention to the environmental aspect has urged the effort to reduce CO2 emission as one of the greenhouse gases. The cement industry is one of the biggest CO2 emitters in this world. Alternative fuel is one of the challenging issues in cement production due to the limited fossil fuel resources and environmental concerns. Meanwhile, hydroge...

The rapid development of textile industries in developing countries has resulted in enormous dye waste, which remains problematic in some areas due to the lack of advanced technology. Adsorption appears as an efficient method for treating dye waste, which often relates to the use of conventional activated carbons produced from non-renewable sources...

The purpose of this study was to analyze the effect of a resin composition on the performance of brake pads with durian seeds (BDs) as the base material. Experiments were done by attaching saw-milled BD particles to a polymer matrix. Various resin compositions were used for preparing the brake pad, which was then tested (press test, puncture test,...

The world faces the threat of an energy crisis that is exacerbated by the dominance of fossil energy sources that negatively impact the sustainability of the earth's ecosystem. Currently, efforts to increase the supply of renewable energy have become a global agenda, including using solar energy which is one of the rapidly developing clean energies...

Municipal solid waste (MSW) has become a challenging issue for many decades, especially in developing countries, leading to several social and environmental problems. Appropriate treatment and conversion of this MSW are urgently demanded. In this study, an efficient conversion of MSW to methanol is proposed and analyzed. The developed system consis...

To solve the problem of unevenly distributed renewables and increase their penetration, large-scale energy storage is necessary. Green hydrogen is suitable for bulk energy storage; however, it still faces storage problems. Therefore, green ammonia has been proposed as a substitute for hydrogen. The combination of renewables and green ammonia produc...

The optimal utilization of renewable energies is a crucial factor toward the realization of sustainability and zero carbon in a future energy system. Tidal currents, waves, and thermal and salinity gradients in the ocean are excellent renewable energy sources. Ocean tidal, osmotic, wave, and thermal energy sources have yearly potentials that exceed...

Achieving complete combustion of fossil fuels has long been thought of as a sufficient remedy for tackling vehicular emissions and the ensuing environmental effects. However, thanks to the increasing awareness around the climate change, the global dialogue has now shifted to realizing a carbon-free economy, which has set stricter curbs on the energ...

In the roadmaps of the automotive industry, the electric vehicle (EV) is regarded as a crucial technology for the future of automotive power systems. The EV has become a top priority of major global car manufacturers and is expected to disrupt the road transportation sector. In Malaysia and Indonesia, EVs just started as an important force. However...

This study proposes a new process design, simulation, and techno-economic analysis of an integrated process plant that produces glucose and furfural from Malaysian empty fruit bunches (EFB). An Aspen Plus-based simulation has been established to develop a process flow diagram of co-production of glucose and furfural along with the mass and energy b...

Sustainable development and efficient integration of different resources are imperative for future energy systems. To solve the uneven temporal–spatial distribution of renewables, green hydrogen and ammonia can be used as short- and long-term energy storage mediums, respectively. The synergistic effect of introducing these two media into an integra...

With every passing second, we witness the effect of the global environmental impact of fossil fuels and carbon emissions, to which nations across the globe respond by coming up with ambitious goals to become carbon-free and energy-efficient. At the same time, electric vehicles (EVs) are developed as a possible solution to reach this ambitious goal...

Due to population growth and economic development, the world is experiencing a global challenge in managing high energy demand. Sustainable energy development should include three aspects: promotion of renewable energy, reduced environmental risk, and high process optimization. However, the biomass feedstock is not suitable for end-users' direct us...

This chapter will focus on how readily available biomass waste from agricultural activities can be used as a cost-effective alternative fuel. Agricultural waste is no longer openly burned or left to rot on the ground, as it has been for a long time, contaminating the atmosphere and emitting greenhouse gases. Several biomass-utilization technologies...

This chapter is prepared to understand basic thermodynamic concepts and adopt them in practical applications. Understanding thermodynamics concepts will help us to apply them in a targeted system to improve its efficiency. Some essential engineering thermodynamics backgrounds will be explained first before discussing the exergy concept, pinch analy...