Effects of heating rate on the evolution of bio-oil during its pyrolysis

Xiong, Zhe; Wang, Lele; Syed‐Hassan, Syed Shatir A.; Xiang, Jun; Han, Hengda; Su, Sheng; Xu, Kai; Jiang, Long; Guo, Junhao; Berthold, Engamba Esso Samy; Xiang, Jun

doi:10.1016/j.enconman.2018.02.078

Cited by 152 publications

(63 citation statements)

References 47 publications

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“…In the presence of co-pressing method, HY produces higher amount of coke/char at lower temperatures and emits higher amount of volatiles during the coke/char stabilization at higher temperatures [46]. Furthermore, coke/char formation from gas phase volatiles may be facilitated at higher reaction temperature with subsequent conversion of the primary coke/char into secondary coke/char [47].…”

Section: Experimental Results From Tga Of Thermal and Catalytic Degradation Of Cellulosementioning

confidence: 99%

“…Therefore, a considerable amount of coke/char was deposited on the catalyst. The coke/char had stabilized at higher temperatures with the formation of more thermally stable polyaromatic coke/char through the gas phase reactions [46,47,58]. Hu et al [59] studied the effect of temperature on catalytic co-pyrolysis of cellulose as well as seaweed on zeolitic catalysts.…”

Section: The Effect Of the Reaction Temperature On The Product Yields Of The Normal Mixing And Co-pressed Samplesmentioning

confidence: 99%

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Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Muhammad

Manos

2021

Catalysts

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Biomass pyrolysis is a promising technology for fuel and chemical production from an abundant renewable source. It takes place usually in two stages; non-catalytic pyrolysis with further catalytic upgrading of the formed pyrolysis oil. The direct catalytic pyrolysis of biomass reduces the pyrolysis temperature, increase the yield to target products and improves their quality. However, in such one-stage process the contact between biomass and solid catalyst particles is poor leading to an excessively high degree of pure thermal pyrolysis reactions. The aim of this study was to enhance the catalyst-biomass contact via co-pressing of biomass and catalyst particles as a pre-treatment method. Catalytic pyrolysis of biomass components with HY and USY zeolites was studied using thermogravimetric analysis (TGA), as well as experiments in a pyrolysis reactor. The liquid and coke yields were characterized using gas chromatography, and TGA respectively. The TGA results showed that the degradation of the co-pressed cellulose occurred at lower temperatures compared to the pure thermal degradation, as well as catalytic degradation of non-pretreated cellulose. All biomass components produced better results using the co-pressing method, where the liquid yields increased while coke/char yields decreased. Bio-oil from catalytic pyrolysis of cellulose with HY catalyst mainly produced heavier fractions, while in the presence of USY catalyst medium fraction was mainly produced within the gasoline range. For hemicellulose catalytic pyrolysis, the catalysts had similar effects in enhancing the lighter fraction, but specifically, HY showed higher selectivity to middle fraction while USY has produced higher percentage of lighter fraction. Using with both catalysts, co-pressing had the best effect of eliminating the heavier fraction and improving the gasoline range fraction. Spent catalyst from co-pressed sample had lower concentrations of coke/char components due to the shorter residence times of volatiles, which suppresses the occurrence of secondary reactions leading to coke/char formations.

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Section: Experimental Results From Tga Of Thermal and Catalytic Degradation Of Cellulosementioning

confidence: 99%

Section: The Effect Of the Reaction Temperature On The Product Yields Of The Normal Mixing And Co-pressed Samplesmentioning

confidence: 99%

Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Muhammad

Manos

2021

Catalysts

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“…Conversely, the mass loss was lower at low temperatures, favoring the polymerization of bio-oil components. 47 The residual carbon content ranged from 12.14% in experiment V to 15.55% in experiment IV. The lower the residual carbon content, the lower the amount of aromatic molecules, which suggests an increased degradation of the bio-oil.…”

Section: Elemental Analysis Of the Bio-oilmentioning

confidence: 89%

Pyrolysis of the Caupi Bean Pod (Vigna unguiculata): Characterization of Biomass and Bio-Oil

Santos

Bispo

Granja

et al. 2020

J. Braz. Chem. Soc.

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The use of agricultural residues for the production of bio-oil is an important alternative to the use of fossil fuels. In this study, the Caupi bean pod (Vigna unguiculata) was characterized and used as biomass in the production of bio-oil. This biomass was evaluated in terms of physicochemical, morphological (scanning electron microscopy (SEM)), and thermal (thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)) characterization, lignocellulosic composition, and pyrolysis processes. The pyrolysis was carried out in a stainless steel fixed-bed reactor (260 mm in length and 60 mm in diameter) under atmospheric nitrogen pressure. Pyrolysis was conducted at 550, 600, and 700 °C and N 2 gas flow of 2, 5, and 7 mL min-1. The chemical composition of the bio-oils was studied through CHN, TGA, Fourier-transform infrared spectroscopy (FTIR), and gas chromatography-mass spectrometry (GC-MS). The results confirmed the bean pod's potential in the thermochemical process. The thermogravimetric analyses demonstrate that there can be a relationship between the components of the principal biomass (cellulose, hemicellulose, and lignin) and the compounds present in the bio-oil. The obtained bio-oils represent bio-products that are rich in compounds of several chemical classes with relevant commercial value such as acids (palmitic, linoleic, oleic, and stearic), alcohols (ethylene glycol), sugars (levoglucosan), and phenols (guaiacol, catechol, phenol, and pyrocatechol).

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“…According to these results, a decrease in the bio-oil yield (from 33% at 15°C/min to 29% at 20 and 25°C/min) and an improvement in the gas yield, with the HR increase from 15°C/min to 25°C/min are observed. Xiong et al (Xiong et al 2018) reported that a large proportion of bio-oil might be evaporated as gas phase volatile at fast HR and for temperature more than 500°C. For the solid fraction, the mass yield is almost constant (around 30%) for all HR; this indicates that the higher HR promoted the cracking of the organic components remaining in the char and the condensable volatiles to form the gaseous products [37].…”

Section: Effect Of the Heating Ratementioning

confidence: 99%

Sustainable Valorization of Olive Pomace Waste to Renewable Biofuels, Biomaterials and Biochemicals Via Pyrolysis Process: Experimental and Numerical Investigation

Aissaoui

Trabelsi²,

Bensidhom³

et al. 2021

Preprint

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This work demonstrates, experimentally and numerically, the potential of Olive Pomace Waste (OPW) to produce renewable biofuels (pyrolytic oil and gas), bio-chemicals (tars as source of bioactive molecules) and bio-fertilizers (chars) through slow pyrolysis. Experimental pyrolysis runs were conducted at 500, 600 and 700°C as final pyrolysis temperature, 15, 20 and 25°C/min as heating rate and 1h as residence time, in a fixed bed pyrolyzer. In the optimum pyrolysis conditions (600°C and 15°C/min), 33 wt.% of oil, 30.00 wt.% of char and 37 wt.% of gas were produced. Recovered pyrolytic oil presents good energy value (HHV between 15.96 and 20.94 MJ/kg) with a great bioactive potential. The released permanent gases show an interesting energy content (LHV up to 11 MJ/Kg) which emphasizes their application in a gas engine to provide renewable electricity in rural olive groves area. The recovered OPW biochar presents a high carbon (C 72.54 wt.%) and nutrients contents (up to 8.42 mg/g of Ca, up to 8.69 mg/g of K and up to 2.02 % of total N) which make it suitable for soil amendment and for long-term carbon sequestration. Kinetic study of OPW pyrolysis, performed using the Distributed Activation Energy Model (DAEM), gives an activation energy values ranging from 121.6 to 151.6 kJ/mol. The investigation of the OPW thermal behavior and reactivity under pyrolysis conditions is useful approach to design and operate slow pyrolysis process at commercial scale, which could be useful by farmers for OPW in olive fields.

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Effects of heating rate on the evolution of bio-oil during its pyrolysis

Cited by 152 publications

References 47 publications

Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Pyrolysis of the Caupi Bean Pod (Vigna unguiculata): Characterization of Biomass and Bio-Oil

Sustainable Valorization of Olive Pomace Waste to Renewable Biofuels, Biomaterials and Biochemicals Via Pyrolysis Process: Experimental and Numerical Investigation

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