Effect of torrefaction conditions on greenhouse crop residue: Optimization of conditions to upgrade solid characteristics

Iáñez-Rodríguez, I.; Martín-Lara, M.A.; Blázquez, G.; Pérez, A.; Calero, M.

doi:10.1016/j.biortech.2017.08.031

Cited by 30 publications

(10 citation statements)

References 43 publications

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“…The VM content decreased from 79.22% to 63.41% across the temperature range, while the FC content increased from 3.23% to 12.01%. These trends are consistent with the compositional analysis results published by other researchers (Rodriguez et al, 2017;Conag et al, 2018).…”

Section: Proximate Analysissupporting

confidence: 93%

Torrefaction of Oil Palm Fronds (Opf) as a Potential Feedstock for Energy Production Processes

Thaim

Rasid

Ismail

2019

Journal of Environmental Engineering and Landscape Management

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Oil palm fronds (OPF) and trunks contribute the highest biomass availability compared with other oil palm wastes. At the moment, they are usually left on the ground around the plantation area to decompose naturally and fertilize the soil. Previous researchers have focused on torrefaction of wood residues and other agricultural biomass with less attention has been paid to the utilization of Malaysia’s biomass such as OPF. Therefore, in this study, torrefaction of OPF was conducted in a tubular reactor at temperatures between 200 and 300 °C and residence time of 30 min. The results reveal an improved heating value as the temperature was increased, from 16.81 to 20.32 MJ/kg after the torrefaction process. The van Krevelen diagram also proved that torrefaction OPF could be classified as an intermediate, between raw OPF and coal. This proves the potential of OPF as one of the alternative feedstocks for energy production process through torrefaction.

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Section: Proximate Analysissupporting

confidence: 93%

Torrefaction of Oil Palm Fronds (Opf) as a Potential Feedstock for Energy Production Processes

Thaim

Rasid

Ismail

2019

Journal of Environmental Engineering and Landscape Management

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“…The higher the treatment temperature was, the greatest changes were observed. The identification of each peak for GCR sample was carried out in a previous study [2]. In this paper, the changes observed due to thermal treatment at high temperatures were analyzed.…”

Section: Ftirmentioning

confidence: 99%

“…This waste is very abundant worldwide and is currently used for compost production. This raw material has been studied and fully described in previous works carried out in our group [1,2]. The search for alternative uses for these materials is essential since it has both economic and environmental benefits.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse Crop Residue and Its Derived Biochar: Potential as Adsorbent of Cobalt from Aqueous Solutions

Iáñez-Rodríguez

Calero

Blázquez

et al. 2020

Water

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This work is focused on the removal of cobalt from aqueous solutions using the greenhouse crop residue and biochars resulting from its pyrolysis at different temperatures, which have not been previously used for this purpose. This study aims to provide insights into the effect of pyrolysis temperature as a key parameter on the cobalt adsorption capacity of these materials. Firstly, the main physicochemical properties of greenhouse crop residue and its biochars prepared under different pyrolysis temperatures were characterized by elemental analysis and FT-IR, among others. Then, the cobalt adsorption capacity of materials was evaluated in batch systems. The best results were obtained for the biochar prepared by pyrolysis at 450 °C (adsorption capacity of 28 mg/g). Generally, the adsorption capacity of the materials increased with pyrolysis temperature. However, when the treatment temperature was increased up to 550 °C, a biochar with worse properties and behavior than cobalt adsorbent was produced. Rather than surface area and other physical properties, functional groups were found to influence cobalt adsorption onto the prepared materials. The adsorption kinetics showed that the adsorption followed pseudo-second-order kinetics model. The obtained equilibrium data were fitted better by the Langmuir model rather than the Freundlich model. Finally, decomposition of loaded-materials was analyzed to assess their possible recycling as fuel materials. The study suggested that greenhouse crop residue can be used as a low-cost alternative adsorbent for cobalt removal from aqueous solutions.

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“…The characteristic absorption bands of cellulose, hemicellulose, and lignin in raw pubescens and pretreated samples after torrefaction were assigned according to the literature. 15 − 18 The characteristic absorbance of lignin occurred at 1635, 1605, 1513, 1462, 1426, 1029, and 834 cm –1 , 16 , 19 where the weak band at 1635 cm –1 was assigned to the conjugated C=O stretching of the aromatic ring. 17 , 18 The absorbance bands at 1605 and 1513 cm –1 were assigned to C–C and C=C stretching of the aromatic ring of lignin, while the band at 1029 cm –1 was due to the C–O stretching of O-CH 3 and C-OH.…”

Section: Results and Discussionmentioning

confidence: 99%

Torrefaction at 200 °C of Pubescens Pretreated with AlCl₃ Aqueous Solution at Room Temperature

et al. 2020

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Metal salt soaking–torrefaction conversion technology was investigated. It was found that AlCl 3 pretreatment of pubescens favored observably the yield of liquid and small-molecular products in torrefaction via changing the composition and structure of the raw material. The maximum conversion of pretreated samples, washed (PSW) and Y liquid were 15.5 and 10.8 wt % (with 0.26 wt % monosaccharides, 0.26 wt % carboxylic acids, 0.38 wt % furan compounds, and 1.28 wt % phenols), where 20.4 wt % hemicellulose, 22.9 wt % cellulose, and 5.7 wt % lignin were converted, respectively. However, for pretreated samples (PS), the maximum conversion and Y liquid reached 44.2 and 32.1 wt %, respectively, along with 96.0 wt % hemicellulose and 31.8 wt % cellulose converted, yielding 2.39 wt % monosaccharides, 5.14 wt % carboxylic acids, 2.60 wt % furan compounds and 10.52 wt % phenols, indicating obvious catalytic effects of residual AlCl 3 on the decomposition of the three major components in torrefaction. Two-dimensional HSQC and electrospray ionization mass spectrometry (ESI-MS) characterizations further confirmed the dominant formation of oligomers derived from holocellulose, lignin, and cross-linkage involving the lignin–carbohydrate complex, indicating that the catalytic thermal cleavage of β-O-4, C-O-C, β-β, 5–5, 4-O-5, C α –C β , and α-O-4 linkages by aluminum species in the samples benefited the yield of liquid as well as monophenols.

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Effect of torrefaction conditions on greenhouse crop residue: Optimization of conditions to upgrade solid characteristics

Cited by 30 publications

References 43 publications

Torrefaction of Oil Palm Fronds (Opf) as a Potential Feedstock for Energy Production Processes

Torrefaction of Oil Palm Fronds (Opf) as a Potential Feedstock for Energy Production Processes

Greenhouse Crop Residue and Its Derived Biochar: Potential as Adsorbent of Cobalt from Aqueous Solutions

Torrefaction at 200 °C of Pubescens Pretreated with AlCl₃ Aqueous Solution at Room Temperature

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Effect of torrefaction conditions on greenhouse crop residue: Optimization of conditions to upgrade solid characteristics

Cited by 30 publications

References 43 publications

Torrefaction of Oil Palm Fronds (Opf) as a Potential Feedstock for Energy Production Processes

Torrefaction of Oil Palm Fronds (Opf) as a Potential Feedstock for Energy Production Processes

Greenhouse Crop Residue and Its Derived Biochar: Potential as Adsorbent of Cobalt from Aqueous Solutions

Torrefaction at 200 °C of Pubescens Pretreated with AlCl3 Aqueous Solution at Room Temperature

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Product

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Torrefaction at 200 °C of Pubescens Pretreated with AlCl₃ Aqueous Solution at Room Temperature