Non-catalytic conversion of wheat straw, walnut shell and almond shell into hydrogen rich gas in supercritical water media

Safari, Farid; Salimi, Mohammad; Tavasoli, Ahmad; Ataei, Abtin

doi:10.1016/j.cjche.2016.03.002

Cited by 44 publications

(21 citation statements)

References 26 publications

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“…In order to discern the difference between IRS and other agricultural wastes performance in SCW media, the current results were compared to those of an earlier study by the authors (Safari et al 2015). Table 3 shows hydrogen production data which had originated from walnut shell, almond shell, wheat straw (Safari et al 2015), and IRS gasification in hydrothermal media.…”

Section: Comparison With Previous Resultsmentioning

confidence: 99%

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Hydrothermal Gasification Performance of Iranian Rice Straw in Supercritical Water Media for Hydrogen-Rich Gas Production

Salimi¹,

Nejati²,

Karimi³

et al. 2016

BioResources

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aAs a clean and green alternative fuel to replace fossil fuels, hydrogen could be an ideal fuel for the future. Supercritical water gasification of lignocellulosic agricultural residues results in H2 production with zero CO2 emission, which makes this technique an attractive technology for hydrogen generation from biomass. Structural analyses were performed to determine the lignin, cellulose, and hemicellulose contents in feedstock. The effects of different process variables (temperature, reaction time, and feed concentration) on supercritical water gasification of Iranian rice straw (IRS) were evaluated. IRS, which has a high content of cellulose and hemicellulose, has significant potential for gaseous product generation under the supercritical water condition. The maximum H2 production of 5.56 mmol/gr of biomass was achieved at 440 °C (temperature), 20 min (reaction time), and 2 wt. % (feed concentration).

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Section: Comparison With Previous Resultsmentioning

confidence: 99%

“…Table 3 shows hydrogen production data which had originated from walnut shell, almond shell, wheat straw (Safari et al 2015), and IRS gasification in hydrothermal media.…”

Section: Comparison With Previous Resultsmentioning

confidence: 99%

Hydrothermal Gasification Performance of Iranian Rice Straw in Supercritical Water Media for Hydrogen-Rich Gas Production

Salimi¹,

Nejati²,

Karimi³

et al. 2016

BioResources

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“…However, despite all these research, the mechanism and process of SCWG of real biomass is not completely clear because of the complex structure of lignocellulosic biomass and interactions between components during the process. Figure 4 presents the schematic pathways for supercritical water gasification of wheat straw as a model compound [31]. Cellulose is an insoluble polymer in the water and consists of glucose subunits.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

“…In this study, experimental conditions including biomass loadings, water loading and temperature were selected according to the previous study which was performed with this reactor by Safari et al [31]. Figure 5 presents the yields of total gas produced and its main components for all feedstocks.…”

Section: Cge (%þ ¼ Carbon In Gas Phasementioning

confidence: 99%

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Hydrothermal gasification of different agricultural wastes in supercritical water media for hydrogen production: a comparative study

et al. 2016

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Conversion of different agricultural residues including almond shell, walnut shell, barley straw, canola stalk, rice straw and wheat straw to hydrogen-rich gas was performed via gasification in supercritical water media in a determined condition. Elemental characterization was performed using CHNSO analyzer. Besides, cellulose and lignin contents in biomass structure were determined according to TAPPI test methods T264cm-97 and T222om-02, respectively. The correlations between the yields of the product gas components with C/H/O ratio in the initial forms of used feedstocks were investigated. In addition, the relation between the components of biomass structure with the yields of main gaseous products was also studied for each feedstock. The maximum hydrogen yield of 8.38 mmol/g was observed for barley straw which has the highest H percentage of 6.5 wt%. Canola stalk with the highest C/H ratio showed the highest total gas yield of 25.3 mmol/g. Canola stalk with highest amount of cellulose and hemicellulose of 67.42 % had the highest CGE of 45 % and barley straw had the highest HGE of 20 %. Higher C/H value and lower oxygen percentage in the initial form of feedstocks resulted in higher total gas and CO 2 yields and lower hydrogen yields. Lignin content in the initial form of the feedstocks was inversely proportional with total gas yields whereas cellulose content showed a straight relation with the total gas yield.

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Hydrogen, a versatile chemical for the future: Applications and production methods

Etezadi,

Wang,

Tsotsis

2024

AIChE Journal

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Hydrogen, the simplest and most abundant element in the universe, is poised today to play a critical role in the transition toward a clean energy future. This perspective article explores the potential of hydrogen as a clean and sustainable energy carrier. First, the historical and modern hydrogen applications across various sectors are examined. Then, the article delves into the different methods for hydrogen production. Since conventional fossil fuel‐based production methods raise environmental concerns, the article explores promising alternatives for cleaner hydrogen generation, including electrolysis powered by renewable energy, biomass gasification, and photocatalytic reforming. The technical details and advantages/disadvantages of hydrogen production methods are discussed, as well as the ongoing research and development efforts to improve the existing techniques and to make them more sustainable, efficient, and cost‐effective. As the world strives for a cleaner energy future, hydrogen holds immense potential to play a transformative role.

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Non-catalytic conversion of wheat straw, walnut shell and almond shell into hydrogen rich gas in supercritical water media

Cited by 44 publications

References 26 publications

Hydrothermal Gasification Performance of Iranian Rice Straw in Supercritical Water Media for Hydrogen-Rich Gas Production

Hydrothermal Gasification Performance of Iranian Rice Straw in Supercritical Water Media for Hydrogen-Rich Gas Production

Hydrothermal gasification of different agricultural wastes in supercritical water media for hydrogen production: a comparative study

Hydrogen, a versatile chemical for the future: Applications and production methods

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