Improving aromatic hydrocarbon content from catalytic pyrolysis upgrading of biomass on a CaO/HZSM-5 dual-catalyst

Zheng, Yunwu; Tao, Lei; Huang, Yongda; Liu, Can; Wang, Zhen; Zheng, Zhifeng

doi:10.1016/j.jaap.2019.04.014

Cited by 47 publications

(24 citation statements)

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“…The highest hydrogen content was achieved with sorbent addition and an increase with temperature at a level of 42%; in comparison, for the same temperature but without sorbent, it was around 8%. This observation proves the additional catalytic properties of CaO sorbent [44]. The most significant change occurred in the case of CO2 concentration with and without CaO addition.…”

Section: Gaseous Pyrolysis Productssupporting

confidence: 71%

Biomass Thermochemical Conversion via Pyrolysis with Integrated CO2 Capture

et al. 2020

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The presented work is focused on biomass thermochemical conversion with integrated CO2 capture. The main aim of this study was the in-depth investigation of the impact of pyrolysis temperature (500, 600 and 700 °C) and CaO sorbent addition on the chemical and physical properties of obtained char and syngas. Under the effect of the pyrolysis temperature, the properties of biomass chars were gradually changed, and this was confirmed by examination using thermal analysis, scanning electron microscopy, X-ray diffraction, and porosimetry methods. The chars were characterised by a noticeable carbon content (two times at 700 °C) resulting in a lower O/C ratio. The calculated combustion indexes indicated the better combustible properties of chars. In addition, structural morphology changes were observed. However, the increasing pyrolysis temperature resulted in changes of solid products; the differences of char properties were not significant in the range of 500 to 700 °C. Syngas was analysed using a gas chromatograph. The following main components were identified: CO, CO2, CH4, H2 and C2H4, C2H6, C3H6, C3H8. A significant impact of CaO on CO2 adsorption was found. The concentration of CO2 in syngas decreased with increased temperature, and the highest decrease occurred in the presence of CaO from above 60% to below 30% at 600 °C.

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Section: Gaseous Pyrolysis Productssupporting

confidence: 71%

Biomass Thermochemical Conversion via Pyrolysis with Integrated CO2 Capture

et al. 2020

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“…The bio-oil produced from lignocellulosic biomass pyrolysis has outstanding potential as a renewable source of green energy and chemicals [1]. It should also be mentioned that several companies have implemented the commercial stages for bio-oil production [2].…”

Section: Introductionmentioning

confidence: 99%

Ca-based Catalysts for the Production of High-Quality Bio-Oils from the Catalytic Co-Pyrolysis of Grape Seeds and Waste Tyres

et al. 2019

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The catalytic co-pyrolysis of grape seeds and waste tyres for the production of high-quality bio-oils was studied in a pilot-scale Auger reactor using different low-cost Ca-based catalysts. All the products of the process (solid, liquid, and gas) were comprehensively analysed. The results demonstrate that this upgrading strategy is suitable for the production of better-quality bio-oils with major potential for use as drop-in fuels. Although very good results were obtained regardless of the nature of the Ca-based catalyst, the best results were achieved using a high-purity CaO obtained from the calcination of natural limestone at 900 °C. Specifically, by adding 20 wt% waste tyres and using a feedstock to CaO mass ratio of 2:1, a practically deoxygenated bio-oil (0.5 wt% of oxygen content) was obtained with a significant heating value of 41.7 MJ/kg, confirming its potential for use in energy applications. The total basicity of the catalyst and the presence of a pure CaO crystalline phase with marginal impurities seem to be key parameters facilitating the prevalence of aromatisation and hydrodeoxygenation routes over the de-acidification and deoxygenation of the vapours through ketonisation and esterification reactions, leading to a highly aromatic biofuel. In addition, owing to the CO2-capture effect inherent to these catalysts, a more environmentally friendly gas product was produced, comprising H2 and CH4 as the main components.

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“…The main components of calcined dolomite are CaO and MgO, which can improve the quality of bio-oil and retain a high bio-oil yield (Zhou et al, 2005;Li and Wu, 2009;Putun, 2010;Shiyu et al, 2016). As shown in previous research, mesoporous catalysts have good fracture effects on biomass, and the addition of CaO can lead to the cracking of large-molecule oxygenates that are generated from pyrolysis (Yunwu et al, 2019). Red mud is a waste residue produced during the process of refining alumina from aluminum ore and contains various metal oxides (Karimi et al, 2010;Justin et al, 2019).…”

Section: Introductionmentioning

confidence: 93%

“…Red mud was the waste slag produced by aluminum smelting, and it has proven to be an efficient, low-cost catalyst (Yunwu et al, 2019). The total content of active phenols increased from 22.91% to 24.10% when the temperature increased from 450 to 600 • C, which implied that the influence of temperature on the generation of active phenols was weakened and the reaction strength was reduced.…”

Section: Gc-ms Analysis Of the Reactive Phenolmentioning

confidence: 99%

“…Red mud is a waste residue produced during the process of refining alumina from aluminum ore and contains various metal oxides (Karimi et al, 2010;Justin et al, 2019). Microporous HZSM-5 catalysts have been recognized to be the most efficient catalyst for the preparation of aromatics by catalytic pyrolysis because of their special three-dimensional structure and their deoxidization and isomerization effect (Yunwu et al, 2019). In recent years, HZSM-5 has gained increasing attention as a catalyst for the pyrolysis of lignocellulosic biomass (Hyung-Su et al, 2014;Yu et al, 2014;Huamei et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Fast Pyrolysis of Corn Stalk for Phenols Production With Solid Catalysts

Wang

Zhang

et al. 2019

Front. Energy Res.

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Corn stover can be converted into a high market value product via catalytic fast pyrolysis. Specifically, through thermochemical conversion, corn stover can be converted into biocrude oil with a high content of unstable phenols, most notably active phenols, which can readily react with aldehydes to form phenolic resins. Therefore, the higher the content of active phenols, the greater the economic value of biocrude oil. This is due to the potential for active phenols to serve as value-added compounds in the form of phenolic resins. Catalysts can be incorporated to improve the reaction rate and product quality during fast pyrolysis. In this study, the effects of three solid catalysts, dolomite, red mud and HZSM-5(25), on the production of active phenols were investigated. The Folin-ciocalteu (FC) method and gas chromatography-mass spectrometry (GC-MS) were utilized to quantify and classify the types of phenolic derivatives present within the bio-oil. The results showed that active phenols with a content exceeding 70% constituted the largest fraction of the phenol derivatives. The formation of active phenols, especially B-phenols, was enhanced by the incorporation of the catalysts HZSM-5, red mud and dolomite. HZSM-5 and dolomite exhibited the best catalytic effect on the production of A-phenols and B-phenols, respectively. The highest content of C-phenols (47.16%) was achieved when red mud was utilized as a catalyst. With regard to the total content of active phenol derivatives, the catalytic effect of dolomite was better than that of HZSM-5 and red mud. The content of total phenols and active phenols increased as the reaction temperature increased from 450 to 600 • C.

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Improving aromatic hydrocarbon content from catalytic pyrolysis upgrading of biomass on a CaO/HZSM-5 dual-catalyst

Cited by 47 publications

References 47 publications

Biomass Thermochemical Conversion via Pyrolysis with Integrated CO2 Capture

Biomass Thermochemical Conversion via Pyrolysis with Integrated CO2 Capture

Ca-based Catalysts for the Production of High-Quality Bio-Oils from the Catalytic Co-Pyrolysis of Grape Seeds and Waste Tyres

Catalytic Fast Pyrolysis of Corn Stalk for Phenols Production With Solid Catalysts

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