Importance of char-volatiles interactions during co-pyrolysis of polypropylene and biomass components

Berthold, Engamba Esso Samy; Yan, Qunshan; Xiong, Zhe; Hu, Xun; Xu, Jun; Jiang, Long; Su, Sheng; Hu, Song; Wang, Yi; Xiang, Jun

doi:10.1016/j.jece.2022.108202

Cited by 16 publications

(8 citation statements)

References 48 publications

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“…The individual PP pyrolysis revealed that PP did not release volatiles at 350 °C. 11,17 In the first step, PP experienced no mass loss and just melted. PP underwent a physical change without any chemical change.…”

Section: Methodsmentioning

confidence: 99%

“…The aromatic structures of the oil were determined by using ultraviolet (UV) fluorescence spectroscopy (Cary Eclipse, Agilent, constant energy difference: −2800 cm –1 ). The detailed procedure was reported previously. , Prior to UV analysis, the oil resulting from the first pyrolysis step was diluted to 16 ppm (w/w), while the oil from the second step was diluted to 4 ppm (w/w). At the same concentration, the fluorescence intensity was corrected by the oil yield to be expressed on the basis of “per gram of feedstock”. , Therefore, the fluorescence intensity expressed a semiquantitative reflection of the content of aromatic compounds.…”

Section: Methodsmentioning

confidence: 99%

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Importance of Physical/Chemical Interactions between Rice Husk and Polypropylene during Their Copyrolysis

Deng,

Berthold,

et al. 2024

Energy Fuels

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Biomass and plastic have distinct compositions, and their pyrolysis could generate reaction intermediates with different structures, which might interact during copyrolysis. This was investigated in the stepwise copyrolysis of rice husk (RH) and polypropylene (PP) in in situ mode and ex-situ modes. The results showed that the oil yield decreased with decreasing RH ratio in the RH and PP mixtures, indicating that molten PP physically prevented the condensation and polymerization of RHderived pyrolyzates, thus inhibiting RH-oil production. The inhibitive effect was stronger in the ex-situ mode because of liquid−gas interactions. In the in situ mode, RH char was dispersed in molten PP, physically suppressing levoglucosan intermolecular proton donation from other RH molecules, decreasing the formation of ketones, furans, pyrans, anhydrosugars, and acids. The liquid−solid/gas interactions between the molten PP and RH/RH-volatiles in the in situ mode enhanced the hydrogen exchange reactions, promoting the formation of alcohols in RH-oil. RH/PP yielded more aromatics than individual PP during pyrolysis at 800 °C, indicating that the hydrogenation of RH-char enhanced the formation of aromatics, especially the heavy aromatics (≥4 rings).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Importance of Physical/Chemical Interactions between Rice Husk and Polypropylene during Their Copyrolysis

Deng,

Berthold,

et al. 2024

Energy Fuels

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“…Although the mass transfer phenomenon is usually analyzed on a bigger scale, DFT can be used to study specific interactions between bonds of some volatiles with the functional groups on the biochar surface. 138 Huang et al 139 found that during xylose pyrolysis, the hydrogen bond interactions of volatile compounds hinder the opening of the ring structure and promote the contraction of the xylose ring. Therefore, if the functional groups on the surface interact with the volatiles as they move out of the particle, the encounter can significantly change the products obtained and modify biochar properties.…”

Section: Dehydration and Cracking/fragmentation (150 To 240 °C) Dehyd...mentioning

confidence: 99%

“…Another important phenomenon in the pyrolysis process is that as volatiles and tars are being produced and transported (by mass transfer) out of the biomass particle, they can interact with the surface and, in that interaction, can condense and constitute biochar formation or react with the functional groups in the surface and release different compounds. Although the mass transfer phenomenon is usually analyzed on a bigger scale, DFT can be used to study specific interactions between bonds of some volatiles with the functional groups on the biochar surface . Huang et al found that during xylose pyrolysis, the hydrogen bond interactions of volatile compounds hinder the opening of the ring structure and promote the contraction of the xylose ring.…”

Section: Modeling the Conversion Of Biomass Macromolecules To Biocharmentioning

confidence: 99%

Atomistic Modeling of Lignocellulosic and Carbonaceous Fuels and Their Pyrolysis Reactions: A Review

Sierra-Jimenez,

Mathews,

Chejne

et al. 2023

Energy Fuels

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This paper explores the utility of large-scale atomistic models to examine the complex relationship between biochar behavior, its structural characteristics, and the reactions involved in its formation. Pyrolysis kinetic models primarily focus on explaining the formation of small volatiles and aromatic structures without fully understanding the carbonization process. To gain a deeper understanding of carbonization and move beyond unrealistic structures resembling levoglucosan, it is necessary to examine the transformation of the lignocellulosic macromolecules into carbonaceous structures from a molecular-level perspective. This includes exploring structural transitions and large-scale reactive dynamics. Furthermore, incorporating atomistic representations derived from experimental data and theoretical modeling can help overcome the limitations of relying solely on empirical and density functional theory approaches due to the need for scale to capture biochar properties. Additionally, by considering structural transitions on a large scale, we can effectively capture the complexity of biomass pyrolysis, the interaction of free radicals, and the pore size distribution, all essential for comprehending biochar reactivity and utility.

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“…Polyolefins may act as hydrogen donors [48][49][50], whereas the combustion of wood and char allows for intensifying the cracking of heavy pyrolysis products [51,52]. Interaction can occur through the gaseous phase: volatile products of polyolefins pyrolysis interact with the char carbon surface and change its structure and reactivity [53,54]. In some works, the catalytic effect of the mineral portion is noted [55,56].…”

Section: Organic Matter Melting and Decompositionmentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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The article provides state-of-the-art research on agglomeration processes during fixed-bed combustion and gasification of low-grade fuels such as biomass and waste (primarily plastic-containing waste). Such fuels demonstrate complex thermal behaviour: their decomposition and combustion are multistage, accompanied by phase transitions, and may lead to fixed-bed mechanical instability and the non-uniformity of air distribution over the cross-section. To clarify the role of physicochemical factors (fuel composition and properties, reactor conditions), data from different sources are compared. The review shows that the fixed-bed agglomeration regimes can, in a rough approximation, be classified by the sintering mechanism (due to the melting of the mineral part or the organic part), with the following search for each mechanism realisation conditions by comparing the fuel properties and characteristic temperatures. Attempts to theoretically describe and numerically simulate the agglomeration phenomenon as a change in the structure of a reacting dispersed medium are also considered: the main directions in which such approaches can be developed are indicated.

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Importance of char-volatiles interactions during co-pyrolysis of polypropylene and biomass components

Cited by 16 publications

References 48 publications

Importance of Physical/Chemical Interactions between Rice Husk and Polypropylene during Their Copyrolysis

Importance of Physical/Chemical Interactions between Rice Husk and Polypropylene during Their Copyrolysis

Atomistic Modeling of Lignocellulosic and Carbonaceous Fuels and Their Pyrolysis Reactions: A Review

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

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