Maximização do teor de carbono fixo em biocarvão aplicado ao sequestro de carbono

Róz, Alessandra Luzia Da; Ricardo, José F. C.; Nakashima, Gabriela Tami; Santos, Lídia; Yamaji, Fábio Minoru

doi:10.1590/1807-1929/agriambi.v19n8p810-814

Cited by 19 publications

(13 citation statements)

References 14 publications

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“…The formation of micro and macro pores is infl uenced by volatile release, which means that high volatile content in the activated carbon may imply a low surface area (Zhang et al, 2004). Volatile contents higher than 11 % were presented by other studies in similar conditions of carbonization and activation of the biomass (Ahmad et al, 2007;Róz et al, 2015;Yang and Lua, 2003), disclosing the high quality of the activated carbon from woody Brazil nut seed capsule.…”

Section: Discussionmentioning

confidence: 88%

“…Negative correlation with yield (Brito et al, 1987) and positive correlation with temperature (Róz et al, 2015) are observed during carbonization step. Increasing on temperature leads to losses of condensable and noncondensable compounds, as CO and CO 2 (Pinheiro et al, 2005;Róz et al, 2015;Yang et al, 2007), reducing yield and fi xing residual carbon.…”

Section: Discussionmentioning

confidence: 99%

“…High content of fi xed carbon confers a matrix able to generate functional groups or surfi cial complex, that serves as bond sites to adsorption of compounds of interest (Aznar, 2011;Mohan and Pittman Jr., 2006). Negative correlation with yield (Brito et al, 1987) and positive correlation with temperature (Róz et al, 2015) are observed during carbonization step. Increasing on temperature leads to losses of condensable and noncondensable compounds, as CO and CO 2 (Pinheiro et al, 2005;Róz et al, 2015;Yang et al, 2007), reducing yield and fi xing residual carbon.…”

Section: Discussionmentioning

confidence: 99%

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Preparation and Characterization of Carbon From the Fruit of Brazil Nut Tree Activated by Physical Process

et al. 2019

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Activated carbon is the name of a big group of materials that presents high degree of porosity and, consequently, an extended internal surface area, with physical and chemical adsorption properties. Innumerous raw materials can be used as precursors, especially biomass. The objective of this study was to obtain activated carbon from physical activation of the fruit of Brazil nut tree (“ouriço”) and to evaluate its physical and chemical properties in function of the differences between the temperatures and atmospheres of activation. The samples were carbonized at 3 different temperatures and the carbons were activated under atmosphere saturated by CO2 or steam. The results showed the influence of activation temperature and atmosphere on physicochemical characteristics of carbon. The carbon from woody Brazil nut seed capsule activated by CO2 and steam at different temperatures had a microporous profile, indicating its use to adsorb organic molecules of small dimensions. Basic characteristic was observed on samples and the carbon produced was thermally stable. Best quality was attributed to carbon activated by steam at 800 °C.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Preparation and Characterization of Carbon From the Fruit of Brazil Nut Tree Activated by Physical Process

et al. 2019

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“…When a given material has high moisture content, it is necessary to dry it before the initial burning stage, but this process requires energy. Most wastes contain high moisture content, and the high moisture content in biomass is one of the major disadvantages of using this material (Róz et al, 2015;Yamaji et al, 2013). However, biomasses were already collected within the indicated moisture content for use in heat generation according to Hansted et al 2016, thus, these materials do not require drying treatment .…”

Section: Resultsmentioning

confidence: 99%

Different Types of Lignocellulosic Materials for Energy Generation in the Ceramic Industry

et al. 2019

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This work aims at the physicochemical characterization of four species: Eucalyptus sp, Pinus sp, Citrus sinensis and Hevea brasiliensis for use in ceramic furnace. Immediate analysis, chemical analyses were carried out (total extractives, Klason lignin, holocellulose and alpha-cellulose content). Results were applied to ANOVA and Tukey for statistics. The ash content of Pinus sp was 1.60%, for volatile material content Eucalyptus sp presented 83.61%, for fixed carbon values, Citrus sinensis presented 20.03%. Chemical analyses in the total extractive content, Citrus sinensis presented 21.76%, Klason lignin content, Pinus sp had 39.24%, Eucalyptus sp 60.29% had the highest holocellulose and alpha-cellulose, which was 42.72%. Pinus sp sample was the one with the highest heating value of 20.090 J/g. According to results obtained in the analyses, it is possible to conclude that all species have potential for applications in ceramic furnace.

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“…Even though the results indicate an inverse relationship between fi xed carbon and heartwood/sapwood ratio, wood that has a greater heartwood/sapwood ratio can increase the fi xed carbon content in the charcoal, since heartwood tends to have a lignin content that is greater than -or even equal -to that observed on sapwood (Klitzke et al 2008;Costa et al 2017;Fonte et al 2017). It is also important to emphasize that the production process is the most important factor that interferes with the fi xed carbon content of charcoal (Róz et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Study of the Influence of Wood Properties on the Charcoal Production: Applying the Random Forest Algorithm

et al. 2021

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The understanding of the relationship between the properties of wood and charcoal makes it possible to improve the production of charcoal. Therefore, the random forest algorithm was used in this study to analyze the influence of eucalyptus wood properties on the quality of charcoal as well as the accuracy of the predicted values concerning the results estimated by support vector regression and multiple linear regression. Six properties of wood and six properties of charcoal obtained from the hybrid Eucalyptus grandis x Eucalyptus urophylla and from twelve clones of Corymbia torelliana x Corymbia critriodora at the age of seven were measured. In the analysis, the measure of mean decrease in node impurity (residual sum of squares) calculated with the random forest and the copula correlation was used to evaluate the relationship between properties of wood and charcoal. The random forest was compared to the support vector regression and multiple linear regression through the coefficient of determination, linear correlation between observed and predicted values, mean absolute error and root mean squared error. The accuracy of the random forest was greater than that obtained with the support vector regression and multiple linear regression, mainly in terms of the coefficient of determination and the linear correlation between observed and predicted values. The yield and quality of the charcoal produced from clones were mainly influenced by the holocellulose content, heartwood/sapwood ratio, and basic wood density. The apparent relative density of charcoal was the variable in which the random forest algorithm reached the best level of explanation of the variability as a function of the properties of wood, while the minor error was observed for the fixed carbon content.

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Maximização do teor de carbono fixo em biocarvão aplicado ao sequestro de carbono

Cited by 19 publications

References 14 publications

Preparation and Characterization of Carbon From the Fruit of Brazil Nut Tree Activated by Physical Process

Preparation and Characterization of Carbon From the Fruit of Brazil Nut Tree Activated by Physical Process

Different Types of Lignocellulosic Materials for Energy Generation in the Ceramic Industry

Study of the Influence of Wood Properties on the Charcoal Production: Applying the Random Forest Algorithm

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