Papers by Keyword: Gasification

Abstract: The global challenges of energy security and climate change highlight the urgent need for renewable energy technologies. Biomass gasification offers a promising thermochemical route for converting organic feedstocks into synthesis gas (syngas), which can serve as a clean fuel or chemical precursor. Despite its potential, large-scale application is constrained by low carbon conversion efficiency, excessive tar formation, unstable syngas composition, and catalyst deactivation. This study applies a Systematic Literature Review (SLR) guided by PRISMA 2020 to examine advances in sustainable catalytic and sorbent materials for improving syngas quality. Literature was retrieved from Scopus, Web of Science, ScienceDirect, and Google Scholar (2015–2025), focusing on experimental and simulation-based studies. Results indicate that eco-friendly catalysts such as Ni–Ce/CaO composites, multifunctional Ni/CaO–Ca₁₂Al₁₄O₃₃, lanthanum-promoted Ni–Al₂O₃, red mud, biochar, zeolites, and CaO-based sorbents enhance hydrogen yield, reduce CO₂, and mitigate tar formation. Multifunctional materials combining catalytic and adsorptive properties, particularly in sorption-enhanced gasification, show strong potential but still face challenges of sintering, deactivation, and reactor-dependent variability. Beyond efficiency gains, sustainable catalysts contribute to circular economy principles by valorizing wastes and biomass residues. Future priorities include nanostructured catalyst design, reactor–catalyst integration, techno-economic feasibility, and life cycle assessment to enable industrial-scale deployment.

Abstract: This research discusses the biomass gasification process for hydrogen production, integrated with a carbon capture process for product purification. A new simulation model was developed in Aspen Plus, incorporating a gasifier, a water–gas shift (WGS) reactor, and a carbon capture unit. Oil palm empty fruit bunches were selected as the biomass feedstock. The simulation investigated the effects of different gasification agents (O₂, air, and steam) and gasifier operating temperatures on hydrogen yield. It also evaluated the influence of MDEA solvent flow rate on CO₂ capture efficiency. Results showed that using a mixture of O₂ and steam with a ratio of 0.5 at 800 °C produced favorable outcomes, with negligible impurities. The addition of steam in the WGS reactor enhanced hydrogen production, with the highest yield achieved at a steam ratio of 0.6. A 2:1 molar ratio of MDEA to CO₂ resulted in up to 99.9% carbon dioxide removal.

Abstract: Gasification is a green technology, which produces combustible gas mixture from solid biomass by partial oxidation at elevated temperatures. Synthesis gas, the desired product of such technology, has more uses than the solid biomass. In this study, a locally developed pilot scale fixed-bed downdraft biomass gasifier was examined. Several gasification experiments using mixed wood wastes (generated from the utilisation of various wood species for making furniture) as feedstock was carried out under varied operating conditions to ascertain their effects on the syngas produced in the process. The effects of grate temperatures and biomass moisture levels on rate of biomass consumption and produced syngas quality were examined via several gasification experiments. The performance of the biomass gasifier system was evaluated in terms of syngas composition, lower heating value, syngas yield and carbon conversion efficiency. The results obtained revealed an average syngas yield of 1.77Nm³ per kg of wood waste consumed. The averaged molar syngas composition obtained was 28.15% CO, 16.64% H₂, 6.19% CO₂, 2.54% CH₄ and 45.42% N₂, while the average syngas LHV was 6.23MJ/Nm³. These results were compared with those published in literature.

Abstract: Metallurgical coke is the main source of fuel and reducing agent for iron and steel industry. Empty fruit bunch (EFB) biomass which is abundantly available in Malaysia could be utilized as a source of energy as well as reducing agent in iron making process. This research presents carbon infiltration within low-grade iron ore via chemical vapor infiltration (CVI) method from EFB pyrolysis vapor. Low-grade iron ore was first heated to remove the combined water (CW) that consequently created pore network within the iron ore. These pores would act as sites for carbon infiltration in the iron ore. The EFB treatment on iron ore has been carried out at different temperatures and the effect of pyrolysis temperature on the carbon infiltration has been investigated. The Brunauer−Emmet−Teller (BET) and Barrett−Joyner−Halenda (BJH) methods have been performed to analyze pore surface and pore volumes of the iron ore. Pore surface and pore volume decreased as the temperature increased indicated that more carbon has been deposited. Using X-ray diffraction (XRD) analysis, it was shown that the low-grade iron ore has been transformed into iron (Fe). The infiltrated carbon from the EFB pyrolysis vapor in the pore surface iron ore is proven to be able to be utilized as source of energy and reducing agent to partially replace metallurgical coke in the blast furnace in order to reduce emission of harmful gas.

Abstract: The paper represents the studies of the process of carbonaceous raw material gasification. The initial material is represented by bituminous coal of grade H with the carbon (C) content of 79.2-85.3 %. Experimental studies have been used to substantiate the parameters of combustible generator gases (СО, Н₂, СН₄) output depending on the temperature of a reduction zone of the reaction channel and gas flow velocity along its length. It has been identified that the volume of the raw material input to be used for gasification process changes in direct proportion depending on the amount of burnt-out carbon and blow velocity. The gasification is intensified in terms of equal concentration of oxygen and carbon in the reaction channel of an underground gas generator. The gasification rate is stipulated by the intensity of chemical reactions, which depend immediately on the modes of blow mixture supply. Moreover, they depend directly on the intensity of oxygen supply to the coal mass and removal of the gasification products.

Abstract: The innovative G-H graphical technique, a plot of Enthalpy vs Gibbs free energy was utilized to obtain a thermodynamically attainable region (AR) for the gasification of waste tyres. The AR is used to examine the interaction between the competing reactions in a gasifier and used to identify optimal targets for the conversion of waste tyres. The objective is to investigate the effect of temperature on the product selectivity. a temperature range of 25-1500°C at 1 bar was used for the analysis. The results show that at temperatures from 200°C to 600°C methane and carbon dioxide are dominant products at minimum Gibbs free energy. However, as the temperature increases, methane production decreases and hydrogen production become more favourable. Between 600°C and 700°C, carbon dioxide and hydrogen are dominant products. The AR results show that the products of gasification (CO and H₂) are preferred products at minimum Gibbs free energy only at temperatures from 800°C to 1500°C, when both water and oxygen are used as oxidants. Therefore, syngas production from tyres is only feasible at high temperatures. Temperatures above 1000°C are recommended to prevent the formation of intermediate radicals.

Abstract: Sludge and screenings management is increasingly becoming a dilemma due its accumulating and tightening environmental regulations that limit its disposal methods. Various sludge management options have been researched, ranging from incineration, thermochemical liquefaction, to pyrolysis and gasification. This work proposes syngas, bio-oil, chemical resources and bio-char production for beneficiation through gasification of a mixture of sludge and screenings at different ratios of 25/75, 50/50 and 75/25. It also studies mass loss and toxins possible destruction by gasification temperatures and reactions. Toxicity and CHNS analysis before and after gasification were aimed at finding sludge energy content, while thermogravimetric analysis (TGA), was to find sampling and stopping temperatures during gasification. The overall best results of high syngas quality (high LHV, H₂, CO and CH₄ contents) and high quality bio-oil (i.e. cleanest, with high crude oil equivalent bonds such as C₁ up to C₃₆ and higher applicable bio-oil resources and chemical species obtained) was achieved by a 75/25 ratio, followed by a 50/50 ratio. The results also showed some possibility of biological and chlorinated hydrocarbon toxins (PCBs and PAHs) break down as well as the reduction of sludge and screenings to about 32% of the initial mass. These results can be further investigated for syngas application in power generation and liquid fuel production. Char toxicity can be analysed for its application in agriculture and for its adsorption properties. Char can be analysed for the presence of metals in it.

Abstract: Indonesia is a tropical country which become one of the largest producer country of biomass especially from agricultural and forestry sector. One of the biomass source that has not been widely utilized is sago. Sago is an alternative source of carbohydrates besides rice, especially in the eastern region such as Papua. The potential of sago in Papua was 66,593 tons in 2018. This potential produces sago waste from processing sago starch, which can pollute the environment. Utilization of sago waste in the form of sago production waste as a source of biomass for electricity generation is an alternative solution. The result shows that sago pulp can be processed into briquettes with the calorific value of 6,327.4 kcal/kg – 6,946.7 kcal/kg. Sago production waste generated from the processing of sago starch is 14% so that the daily waste potential is 25.54 tons/day. Based on this potential, OWRS technology using pyrolysis-gasification obtained 6.6 tons/day of sago charcoal briquettes. The potential of heat energy was 42.03 Gcal/day. The potential of electricity that can be produced with updraft-fixed bed gasification from sago charcoal briquettes was 5.18 MWh. The theoretical power is 2.03 MW with an output power of 215.83 kW at 11% efficiency.

Abstract: National energy needs have been met by non-renewable energy resources, such as natural gas, petroleum, coal and so on. However, non-renewable energy reserves are depleting and there will be an energy crisis. Conversion of biomass into energy is one solution to overcome this. Indonesia, with its biodiversity, has enormous biomass potential, especially from oil palm plantations and also sugar cane plantations. From the oil palm plantation point of view, oil palm shells and oil palm empty fruit bunches are side products. These wastes can be treated with gasification technology to produce gas fuel. The gasification tool model used in this study is a downdraft gasifier equipped with a cyclone to separate gases with solids or liquids resulting from the gasification process. The results of the gasification process show that the more feeds are introduced, the more syngas is produced during the gasification process. The more feeds, the longer the syngas release time. The two variables have a correlation, that is, between the weight of syngas and the time for syngas removal to increase in line with the addition of the amount of feed entered. Syngas analysis of oil palm empty fruit bunches contains 4.959% H₂ and 5.759% CO. Whereas the analysis of syngas of oil palm shells contained 2.524% H₂, 6.391% CO, and 0.895% CH₄.

Abstract: Energy has an important role in the survival of the tea processing industry. The costs for energy generation and application have a large contribution to the total cost of the tea processing. The use of fuel oil and electricity, especially in the drying process is the biggest energy user stage. In line with the development of Indonesia's tea processing industry, it is felt necessary to immediately utilize the source of biomass in tea plantations through the application of gasification technology. The development of tea processing in the future should pay more attention to aspects of energy and the environment as the main discussion. This study aims to examine the development of gasification technology in converting biomass as thermal energy to meet gas quality in the tea drying process. The hypothesis is that through the gasification biomass technology of tea plantations, will produce gas as thermal energy that meets the quality of the tea drying process. The target to be achieved is in the form of laboratory technical data for the design, operation of the process, scale-up and evaluation of the performance of the gasifier which includes flame propagation, simulation of combustion and optimum operating conditions with temperature process variables, air flow rate and gas products, tea biomass capacity, and the length of the gasification process.