Mechanistic insights and kinetics of torrefaction of pine wood biomasses using solid-state NMR

Brotto, Jaqueline de Oliveira; Cruz, T.; Pereira, Isabela O.; Ienczak, Jaciane Lutz; Peralta, Rosely A.; Lázaro-Martínez, Juan Manuel; José, Humberto Jorge; Rodríguez‐Castellón, Enrique; Moreira, Regina de Fátima Peralta Muniz

doi:10.1016/j.jaap.2023.106019

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…In the region of aromatic fragments, the signal within 108-144 ppm can be given by unsubstituted and/or alkyl-substituted aromatic carbon atoms. The peak at 147-149 ppm is typical in the spectra of lignin structural units, and it is attributed to the oxygen-substituted carbon atoms of the aromatic rings syringyl and guaiacylpropane units [49,57]. NMR spectra of HA have more intense signals in this region compared to FA (Figure 5).…”

Section: Interpretation Of the Nmr Spectramentioning

confidence: 99%

The Use of Spectroscopic Methods to Study Organic Matter in Virgin and Arable Soils: A Scoping Review

Lodygin,

Abakumov

2024

Agronomy

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The use of modern spectroscopic methods of analysis, which provide extensive information on the chemical nature of substances, significantly expands our understanding of the molecular composition and properties of soil organic matter (SOM) and its transformation and stabilization processes in various ecosystems and geochemical conditions. The aim of this review is to identify and analyze studies related to the application of nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopy techniques to study the molecular composition and transformation of organic matter in virgin and arable soils. This article is mainly based on three research questions: (1) Which NMR spectroscopy techniques are used to study SOM, and what are their disadvantages and advantages? (2) How is the NMR spectroscopy technique used to study the molecular structure of different pools of SOM? (3) How is ESR spectroscopy used in SOM chemistry, and what are its advantages and limitations? Relevant studies published between 1996 and 2024 were searched in four databases: eLIBRARY, MDPI, ScienceDirect and Springer. We excluded non-English-language articles, review articles, non-peer-reviewed articles and other non-article publications, as well as publications that were not available according to the search protocols. Exclusion criteria for articles were studies that used NMR and EPR techniques to study non-SOM and where these techniques were not the primary methods. Our scoping review found that both solid-state and solution-state NMR spectroscopy are commonly used to study the structure of soil organic matter (SOM). Solution-phase NMR is particularly useful for studying soluble SOM components of a low molecular weight, whereas solid-phase NMR offers advantages such as higher 13C atom concentration for stronger signals and faster analysis time. However, solution-phase NMR has limitations including sample insolubility, potential signal aggregation and reduced sensitivity and resolution. Solid-state NMR is better at detecting non-protonated carbon atoms and identifying heterogeneous regions within structures. EPR spectroscopy, on the other hand, offers significant advantages in experimental biochemistry due to its high sensitivity and ability to provide detailed information about substances containing free radicals (FRs), aiding in the assessment of their reactivity and transformations. Understanding the FR structure in biopolymers can help to study the formation and transformation of SOM. The integration of two- and three-dimensional NMR spectroscopy with other analytical methods, such as chromatography, mass spectrometry, etc., provides a more comprehensive approach to deciphering the complex composition of SOM than one-dimensional techniques alone.

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Section: Interpretation Of the Nmr Spectramentioning

confidence: 99%

The Use of Spectroscopic Methods to Study Organic Matter in Virgin and Arable Soils: A Scoping Review

Lodygin,

Abakumov

2024

Agronomy

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“…wood serves as one of the sources of sawdust. This wood typically contains ash content, volatile matter, and fixed carbon ranging from 0.83% to 0.92%, 65.8% to 82%, and 17.17% to 33.3%, respectively, with a higher heating value between 14.64 and 20.1 MJ/g [9,10]. The ash does not combust, making it undesirable for energy generation, volatile materials lead to rapid combustion, playing a crucial role in the ignition process [11], and, finally, fixed carbon ensures a slower and more prolonged burn and is directly related to the heating value [12].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Solid Biofuel Production: Transforming Sewage Sludge and Pinus sp. Sawdust into Resources for the Circular Economy

Pereira,

Zanuncio,

Carvalho

et al. 2024

Sustainability

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The lack of adequate sanitation in Brazil overloads the health system and causes deaths. The utilization of sewage sludge hinders advancements in water treatment. This study aimed to assess the feasibility of producing briquettes by blending sewage sludge with Pinus sp. sawdust. The sewage sludge was sourced from a water treatment facility, while the Pinus sp. sawdust was obtained from a sawmill. Elemental analysis, proximate analysis, and calorific value were evaluated for both biomasses. Briquettes were manufactured using a hydraulic press, varying the proportion of sewage sludge from 0% to 95%, followed by thermogravimetric analysis. Pinus sp. sawdust exhibited higher carbon, oxygen, and hydrogen content, whereas sewage sludge contained more nitrogen and sulfur. The sawdust had greater fixed carbon content, volatile matter, and calorific value, while the sewage sludge had higher ash content. Samples with higher sewage sludge content showed better thermal resistance, with 100% sewage sludge retaining 63.3% mass after exposure to 950 °C. Briquettes with higher sewage sludge content had increased energy density. Considering the elevated nitrogen, sulfur, and ash content, sewage sludge should be limited to 5% in briquette production with Pinus sp. sawdust. This research underscores a significant avenue for sewage sludge utilization and sustainable bioenergy production.

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“…They observed the highest total fuel yield at 335 µm particle size, 300 mg catalyst, and 900 W power. Brotto et al [19] optimized the torrefaction process of wood chips through a two-factor experiment, with the results indicating that the optimal product properties were achieved at a temperature of 290 • C and a reaction time of 30 min. Singh et al [20] analyzed the influence of the torrefaction temperature and reaction time on the higher heating value (HHV) of eucalyptus using response surface methodology (RSM) and a central composite design.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Method for Evaluating the Preparation of High-Quality Fuel from Various Types of Biomass through Torrefaction

Guo,

Deng,

Zhao

et al. 2024

Molecules

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The pretreatment for torrefaction impacts the performance of biomass fuels and operational costs. Given their diversity, it is crucial to determine the optimal torrefaction conditions for different types of biomass. In this study, three typical solid biofuels, corn stover (CS), agaric fungus bran (AFB), and spent coffee grounds (SCGs), were prepared using fluidized bed torrefaction. The thermal stability of different fuels was extensively discussed and a novel comprehensive fuel index, “displacement level”, was analyzed. The functional groups, pore structures, and microstructural differences between the three raw materials and the optimally torrefied biochar were thoroughly characterized. Finally, the biomass fuel consumption for household heating and water supply was calculated. The results showed that the optimal torrefaction temperatures for CS, AFB, and SCGs were 240, 280, and 280 °C, respectively, with comprehensive quality rankings of the optimal torrefied biochar of AFB (260) > SCG (252) > CS (248). Additionally, the economic costs of the optimally torrefied biochar were reduced by 7.03–19.32%. The results indicated that the displacement level is an index universally applicable to the preparation of solid fuels through biomass torrefaction. AFB is the most suitable solid fuel to be upgraded through torrefaction and has the potential to replace coal.

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Mechanistic insights and kinetics of torrefaction of pine wood biomasses using solid-state NMR

Cited by 8 publications

References 37 publications

The Use of Spectroscopic Methods to Study Organic Matter in Virgin and Arable Soils: A Scoping Review

The Use of Spectroscopic Methods to Study Organic Matter in Virgin and Arable Soils: A Scoping Review

Sustainable Solid Biofuel Production: Transforming Sewage Sludge and Pinus sp. Sawdust into Resources for the Circular Economy

An Optimized Method for Evaluating the Preparation of High-Quality Fuel from Various Types of Biomass through Torrefaction

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