Real-time monitoring of alkali release during CO2 gasification of different types of biochar

Ge, Yaxin; Ding, Saiman; Kong, Xiangrui; Kantarelis, Efthymios; Engvall, Klas; Pettersson, Jan B. C.

doi:10.1016/j.fuel.2022.125102

Cited by 15 publications

(5 citation statements)

References 61 publications

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“…The use of the K/C ratio also presumes that no K is volatilized from the sample during the char conversion. In support of this, our recent study confirmed that no detectable release of K occurs during industrial char conversion of up to around 90% at temperatures above 800 °C. In view of this and the temperature history of the samples (gasification at a temperature up to 1150 °C and treatment at 900 °C prior to TGA), it can therefore be considered that no/minimal K is emitted up to a conversion of 90% in the present study.…”

Section: Results and Discussionsupporting

confidence: 76%

Potassium-Induced Phenomena and Their Effects on the Intrinsic Reactivity of Biomass-Derived Char during Steam Gasification

Ding,

Kantarelis,

Engvall

2023

ACS Omega

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The mineral content of biomass plays an important role in the gasification rate of biomass-derived char. The understanding and quantification of mineral-related phenomena are thus of importance when considering gasification reactor design. In the present work, the potassium-induced catalytic phenomena during gasification of biomass-derived char have been studied. Char samples with similar structure and different intrinsic potassium content were gasified in a steam atmosphere at a temperature range of 700−800 °C. It was found that for all the samples, irrespective of the temperature and the initial potassium content, there is a critical K/C ratio (5 × 10 −3 ), whereafter the catalytic phenomena prevail. The instantaneous conversion rate of the char is positively correlated with the potassium content and the progressively increasing conversion. The application of the modified random pore model was able to capture the later stages of conversion by the introduction of two additional parameters (c and p). It was found that these constants are not just fitting parameters but that there is an underlying physical significance with c being directly related to the intrinsic potassium content while being temperature independent and with p being temperature dependent.

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Section: Results and Discussionsupporting

confidence: 76%

Potassium-Induced Phenomena and Their Effects on the Intrinsic Reactivity of Biomass-Derived Char during Steam Gasification

Ding,

Kantarelis,

Engvall

2023

ACS Omega

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“…Currently, a variety of catalysts, including molecular sieves ( Carlson et al, 2011 ; Martinez and Corma, 2011 ; Zhang et al, 2011 ; Dickerson and Soria, 2013 ; Li et al, 2014 ; Jia et al, 2017 ; Dai et al, 2020 ; Liang et al, 2021 ; Mardiana et al, 2022 ), mesoporous materials ( Iliopoulou et al, 2007 ; Perego and Bosetti, 2011 ; Xu et al, 2012 ; Antunes et al, 2016 ; Herbst and Janiak, 2017 ; Shen et al, 2020 ), metal oxides ( Barta et al, 2014 ; Matson et al, 2011 ; O'Neill et al, 2015 ; Robinson et al, 2016 ; Thompson et al, 2015 ), and alkali/alkaline earth metals ( Xiong et al, 2021 ; Esso et al, 2022 ; Ge et al, 2022 ; Macedo et al, 2022 ; Wang et al, 2022 ; Ding et al, 2023 ), are widely employed in high temperature catalytic conversion processes for biomass. Heated tobacco sheets, as a unique type of biomass resource, have the potential to benefit from the application of these catalysts in low temperature catalytic pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Influence of anionic species on the low temperature pyrolysis performance of heated tobacco sheets catalyzed by sodium salts

Zhao,

Wang,

et al. 2024

Front. Chem.

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Development of low temperature catalytic pyrolysis technology for heated tobacco sheets is expected to increase the aroma of heated tobacco products and improve their overall smoking quality. In this study, the low temperature pyrolysis performances of heated tobacco sheets catalyzed by various anionic sodium salts were investigated using TG-DTG, Py-GC-MS technology and smoke routine chemical composition analysis. The results showed that the total weight loss between 100°C and 300°C increased by 7.8%–13.15% after adding various anionic sodium salts, among which, sodium acetate and sodium tartrate showed a relatively higher weight loss. The relative content of free hydroxyacetone, furfuryl alcohol, butyrolactone and megastigmatrienone in the pyrolysis gas increased, while the relative content of free nicotine decreased. With the change of anionic species, the catalytic decomposition ability of cellulose, lignin, and other substances may change, resulting in the distribution alteration of compounds in the pyrolysis gas. After adding sodium acetate and sodium citrate, the release of total particulate matter (TPM), glycerol, and nicotine in flue gas increased. Overall, the addition of sodium acetate and sodium citrate showed a higher low temperature pyrolysis performance of heated tobacco sheets. The research results in this paper provide data support for changing the low temperature catalytic pyrolysis performance of heated tobacco sheets by adjusting the type of anions in sodium salts.

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“…Table 7 also includes gasification kinetic parameters for pine, wood and branches, furniture waste, and straw. The TG-DTA results 49 obtained when the samples were gasified with gasification by 35%-CO 2 /N 2 -balance after being heated up to 900 °C in a N 2 atmosphere were modeled with RPM, MRPM, and eMRPM. k RPM values were also modeled.…”

Section: Kinetic Models For the Co 2 Gasification Of Pbmentioning

confidence: 99%

Hardwood Branch Char Gasification with CO₂: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model

Koido,

Hoshi,

Sato

2023

Energy Fuels

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Pruned branches (PBs) from fruit trees are the only woody biomass produced in agriculture in Japan and are thus considered a local resource. Yet, the use of fruit-tree PBs to produce energy on a small scale has not been investigated. Here, fuel characteristics of PB char were studied considering its use in gasification for heat and power generation, and a gas−solid reaction model was proposed to describe the CO 2 gasification of char produced from PBs. The reaction rate patterns generated during the CO 2 gasification of the studied char can be broadly classified into those associated with cultivated fruit-tree PBs, park tree PBs, and timber waste. The porous structure of the char indicated that the CO 2 molecules diffused into the pores via Knudsen diffusion, and fruit-tree PBs had a smaller average pore diameter but a higher Brunauer−Emmett−Teller (BET) surface area. In addition, the extended modified random pore model (eMRPM) was proposed as a new gas−solid reaction model. This model describes the peak of gasification rate at the end of gasification more accurately than conventional models. Furthermore, higher K and Ca contents in char resulted in a higher degree of correlation between the eMRPM and experimental data at 800 °C.

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Real-time monitoring of alkali release during CO2 gasification of different types of biochar

Cited by 15 publications

References 61 publications

Potassium-Induced Phenomena and Their Effects on the Intrinsic Reactivity of Biomass-Derived Char during Steam Gasification

Potassium-Induced Phenomena and Their Effects on the Intrinsic Reactivity of Biomass-Derived Char during Steam Gasification

Influence of anionic species on the low temperature pyrolysis performance of heated tobacco sheets catalyzed by sodium salts

Hardwood Branch Char Gasification with CO₂: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model

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Real-time monitoring of alkali release during CO2 gasification of different types of biochar

Cited by 15 publications

References 61 publications

Potassium-Induced Phenomena and Their Effects on the Intrinsic Reactivity of Biomass-Derived Char during Steam Gasification

Potassium-Induced Phenomena and Their Effects on the Intrinsic Reactivity of Biomass-Derived Char during Steam Gasification

Influence of anionic species on the low temperature pyrolysis performance of heated tobacco sheets catalyzed by sodium salts

Hardwood Branch Char Gasification with CO2: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model

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Hardwood Branch Char Gasification with CO₂: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model