Influence of pressure and sunflower husks ash as catalyst on tire-char steam gasification

Śpiewak, Katarzyna; Soprych, Piotr; Czerski, Grzegorz

doi:10.1016/j.egyr.2023.03.085

Cited by 6 publications

(4 citation statements)

References 55 publications

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“…The low reactivity of the tyre char may be due to its high elemental carbon content, low value of structural parameters and low content of catalytically active compounds [140,148,165,166]. Due to the low reactivity of tyre char, it may require the use of catalysts during the gasification process, especially at lower temperatures [152,159].…”

Section: Effects Of Temperaturementioning

confidence: 99%

“…However, tyre pyrolysis char is the only material that was accompanied by an improvement in the conversion degree from 87.5 to 97.5% as the gasification pressure increased. Śpiewak et al subjected tyre char to steam gasification in the presence of sunflower husk ash as a catalytic additive in amounts of 5, 10, and 15 wt.% at temperatures of 800, 850, 900, and 1000 • C, and at pressures of 0.5, and 1.0 MPa [159]. The authors noted an increase in the formation rate and yield of CO with increasing pressure, which has been linked to an increase in the number of active sites on the surface of the tyre char, as well as the promotion of heterogeneous gas-solid reactions.…”

Section: Effects Of Total Pressurementioning

confidence: 99%

“…The greatest improvement in the CO 2 gasification rate of tyre char was achieved with sunflower husk ash, which has the highest K 2 O content. Śpiewak et al [159] also studied the effect of sunflower husk ash addition at 5, 10, and 15 wt.% on the course of steam gasification of tyre char using the thermovolumetric method in the temperature range of 800-1000 • C and at pressures of 0.5 and 1 MPa. Based on the analysis of the rate curves for the formation of CO and H 2 , an increase in the intensity of their formation in the catalytic process was noted.…”

Section: Effect Of Catalystsmentioning

confidence: 99%

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Studies on the Thermochemical Conversion of Waste Tyre Rubber—A Review

Soprych,

Czerski,

Grzywacz

2023

Energies

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Waste from scrap tyres, due to its high volume (17 million Mg per year) and durability resulting from the physical and chemical properties, requires innovative approaches for efficient and environmentally friendly management. In many countries, the landfilling of waste tyres is banned (e.g., EU, USA, UK); however, waste tyres can be a source of valuable materials such as carbon black, pyrolysis oil, hydrogen-rich syngas, tyre char, as well as energy. The purpose of this article is to provide a synthesis of the state of knowledge regarding the thermal conversion of waste tyres by pyrolysis and gasification, taking into account the use of different measurement techniques and reactor types. These technologies are forward-looking and have a high degree of flexibility in terms of product sourcing, depending on the process conditions. The properties of waste from used tyres were analysed, i.e., the composition of the content of individual components and the main chemical substances. The results encompassed ultimate and proximate analyses of rubber from tyres, as well as the physical and chemical parameters of the tyre char obtained through pyrolysis. This article compiles available literature data regarding the impact of process and raw material parameters, such as temperature and time conditions, pressure, particle size, and catalyst addition on the pyrolysis and gasification processes. It also explores the influence of these factors on the yield and properties of the products, including pyrolysis oil, gas, synthesis gas, and tyre char.

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Section: Effects Of Temperaturementioning

confidence: 99%

Section: Effects Of Total Pressurementioning

confidence: 99%

Section: Effect Of Catalystsmentioning

confidence: 99%

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Studies on the Thermochemical Conversion of Waste Tyre Rubber—A Review

Soprych,

Czerski,

Grzywacz

2023

Energies

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“…The environmental impact of the thermal treatment technologies is relatively small and is caused by gas and flying ash emissions as well as the generation of liquid tar and solid residues. The available thermal treatment technologies include direct combustion, pyrolysis, gasification, and their combinations [7][8][9][10][11]. The solid residues (ash powders) generated during combustion, pyrolysis, and gasification processes of sunflower seed husks are used as adsorbents for remediation of water or industrial liquid effluents [12,13] in the ceramic industry [14], in the iron ore sintering process [15], and as a filler for epoxy-based composites [16].…”

Section: Introductionmentioning

confidence: 99%

Composition and Textural Characteristics of Char Powders Produced by Thermomechanical Processing of Sunflower Seed Husks

Frolov,

Silantiev,

Sadykov

et al. 2023

Powders

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The paper presents the results of experimental studies on the production of fine char powder from sunflower seed husks by a novel method of thermomechanical treatment with pulsed shock waves and supersonic jets of the mixture of ultra-superheated (above 2000 °C) steam and carbon dioxide, as well as the results of examination of the produced char powder in terms of its chemical, phase, and granulometric composition and structural, morphological, and texture characteristics. The objective of the research is to explore the possibility of using the resulting char powder as a sorption-active material for organic substances. It is shown that the obtained char particles and their agglomerates have an average size of 20–30 nm and 12–24 µm, respectively, have the shape of disks and ellipsoids, consist mainly of amorphous carbon (up to 56 wt%) and oxygen (up to 42 wt%), and have a specific surface area of 1.1–1.7 m2/g. It is concluded that such a char powder can be used as an absorbent for organic substances when dried and deagglomerated.

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