Experimental basic factors in the production of H2 via supercritical water gasification

Ferreira-Pinto, Leandro; Parizi, Marcela Prado Silva; Araújo, Paulo Cardozo Carvalho de; Zanette, A. F.; Cardozo‐Filho, Lúcio

doi:10.1016/j.ijhydene.2019.08.023

Cited by 44 publications

(27 citation statements)

References 127 publications

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“…Furthermore, the intermediates formed underwent decomposition reactions during the release of gases to generate new intermediate molecules. 32 The carbon-containing substances may be formed due to polymerization and condensation of the water-soluble compounds. At the same time, the water-insoluble fraction is pyrolyzed to form a blackened biomass solid which resembles the original biomass.…”

Section: Results and Discussionmentioning

confidence: 99%

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Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

et al. 2021

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In this study, rice husk biomass was gasified under sub- and supercritical water conditions in an autoclave reactor. The effect of temperature (350–500 °C), residence time (30–120 min), and feed concentration (3–10 wt %) was experimentally studied using the response surface methodology in relation to the yield of gasification products. The quadratic models have been suggested for both responses. Based on the models, the quantitative relationship between various operational conditions and the responses will reliably forecast the experimental outcomes. The findings revealed that higher temperatures, longer residence times, and lower feed concentrations favored high gas yields. The lowest tar yield obtained was 2.98 wt %, while the highest gasification efficiency and gas volume attained were 64.27% and 423 mL/g, respectively. The ANOVA test showed that the order of the effects of the factors on all responses except gravimetric tar yield follows temperature > feed concentration > residence time. The gravimetric tar yield followed a different trend: temperature > residence time > feed concentration. The results revealed that SCW gasification could provide an effective mechanism for transforming the energy content of RH into a substantial fuel product.

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Section: Results and Discussionmentioning

confidence: 99%

“… 59 Gasification reactions in SCW gasification are stated to be more effective when the concentration of feed is less than 10 wt %. 32 …”

Section: Results and Discussionmentioning

confidence: 99%

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

et al. 2021

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“…3.2. Regarding the reactor materials, the materials stated as corrosion-resistant include stainless steels, nickel alloys, titanium, tantalum, noble metals, and ceramics [156]. Among those materials, nickel alloys (e.g., Inconel and Hastelloy), titanium, and stainless steel were the most used reactor materials because of catalytic impacts and economic aspects.…”

Section: Corrosion Types and The Proposed Solutionsmentioning

confidence: 99%

Analysis of operational issues in hydrothermal liquefaction and supercritical water gasification processes: a review

Ghavami

Özdenkçi

Salierno

et al. 2021

Biomass Conv. Bioref.

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Biomass is often referred to as a carbon–neutral energy source, and it has a role in reducing fossil fuel depletion. In addition, biomass can be converted efficiently into various forms of biofuels. The biomass conversion processes involve several thermochemical, biochemical, and hydrothermal methods for biomass treatment integration. The most common conversion routes to produce biofuels include pyrolysis and gasification processes. On the other hand, supercritical water gasification (SCWG) and hydrothermal liquefaction (HTL) are best suitable for converting biomass and waste with high moisture content. Despite promising efficiencies, SCWG and HTL processes introduce operational issues as obstacles to the industrialization of these technologies. The issues include process safety aspects due to operation conditions, plugging due to solid deposition, corrosion, pumpability of feedstock, catalyst sintering and deactivation, and high production costs. The methods to address these issues include various reactor configurations to avoid plugging and optimizing process conditions to minimize other issues. However, there are only a few studies investigating the operational issues as the main scope, and reviews are seldomly available in this regard. Therefore, further research is required to address operational problems. This study reviews the main operational problems in SCWG and HTL. The objective of this study is to enhance the industrialization of these processes by investigating the operational issues and the potential solutions, i.e., contributing to the elimination of the obstacles. A comprehensive study on the operational issues provides a holistic overview of the biomass conversion technologies and biorefinery concepts to promote the industrialization of SCWG and HTL.

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“…Harnessing agro-industrial wastes for hydrogen power generation is a sustainable way to add value to otherwise worthless materials and help the environment by reducing greenhouse gas emissions (Ferreira-Pinto et al, 2019). Gasification is an oxidative thermochemical process that aims at the conversion of biomass into fuels (mostly syngas), hydrogen and methane, among others (Farzad et al, 2016).…”

Section: Supercritical Watermentioning

confidence: 99%

“…It is also desirable that catalysts could prevent polymerization of intermediate compounds such as furans, aromatic aldehydes and phenols, therefore improving gasification yields. Examples of catalysts are included in the classes of alkali metals, transition metals, metal oxides and minerals (Ferreira-Pinto et al, 2019). Madenoglu et al (2011) studied the supercritical water gasification of various agricultural residues such as cauliflower, tomato peel, and hazelnut shells at 600 • C and 350 bar for 0.3 min, with and without addition of K 2 CO 3 as catalyst.…”

Section: Supercritical Watermentioning

confidence: 99%

Supercritical Fluids: A Promising Technique for Biomass Pretreatment and Fractionation

Escobar

Silva

Pirich

et al. 2020

Front. Bioeng. Biotechnol.

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Lignocellulosic biomasses are primarily composed of cellulose, hemicelluloses and lignin and these biopolymers are bonded together in a heterogeneous matrix that is highly recalcitrant to chemical or biological conversion processes. Thus, an efficient pretreatment technique must be selected and applied to this type of biomass in order to facilitate its utilization in biorefineries. Classical pretreatment methods tend to operate under severe conditions, leading to sugar losses by dehydration and to the release of inhibitory compounds such as furfural (2-furaldehyde), 5-hydroxy-2-methylfurfural (5-HMF), and organic acids. By contrast, supercritical fluids can pretreat lignocellulosic materials under relatively mild pretreatment conditions, resulting in high sugar yields, low production of fermentation inhibitors and high susceptibilities to enzymatic hydrolysis while reducing the consumption of chemicals, including solvents, reagents, and catalysts. This work presents a review of biomass pretreatment technologies, aiming to deliver a state-of-art compilation of methods and results with emphasis on supercritical processes.

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Experimental basic factors in the production of H2 via supercritical water gasification

Cited by 44 publications

References 127 publications

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

Analysis of operational issues in hydrothermal liquefaction and supercritical water gasification processes: a review

Supercritical Fluids: A Promising Technique for Biomass Pretreatment and Fractionation

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