Microwave-assisted catalytic pyrolysis of torrefied corn cob for phenol-rich bio-oil production over Fe modified bio-char catalyst

Dai, Leilei; Zeng, Zihong; Tian, Xiaojie; Jiang, Lin; Yu, Zhenting; Wu, Qiuhao; Wang, Yunpu; Liu, Yuhuan; Ruan, Roger

doi:10.1016/j.jaap.2019.104691

Cited by 68 publications

(32 citation statements)

References 32 publications

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“…Dai et al [ 29 ] has reported the same trend with bio oil. As explained in their study as well, the iron impregnated biochar formed during the pyrolysis itself act as a catalyst and facilitates the reforming or deoxygenation of pyrolysis vapors, forming the non-condensable gas.…”

Section: Resultssupporting

confidence: 55%

“…Interestingly, post-pyrolysed samples exhibited slightly better atomic percentage of iron on the surface. The quantity of iron impregnation on UST modified biochars was better than those previously reported in the study by Dai et al [29] in which they could achieve 0.15 percent of Fe 3+ ions by using 0.2 mols of iron nitrate solution.…”

Section: Effect Of Impregnation On Biochar Surface Elemental Compositioncontrasting

confidence: 65%

“…The pre-treated samples at 170 kHz (Fe-UST3 and Fe-UST4) had clearly lower yields compared to the untreated or non-impregnated UST-samples. Dai et al [29] has reported the same trend with bio oil. As explained in their study as well, the iron impregnated biochar formed during the pyrolysis itself act as a catalyst and facilitates the reforming or deoxygenation of pyrolysis vapors, forming the non-condensable gas.…”

Section: Effect Of Iron Impregnation On Pyrolysis Product Yieldssupporting

confidence: 52%

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Pre- and post-pyrolysis effects on iron impregnation of ultrasound pre-treated softwood biochar for potential catalysis applications

2021

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Slow pyrolysis is widely used to convert biomass into useable form of energy. Ultrasound pre-treatment assisted pyrolysis is a recently emerging methodology to improve the physicochemical properties of products derived. Biochar, the solid residues obtained from pyrolysis, is getting considerable attention because of its good physicochemical properties. Various modification techniques have been implemented on biochars to enhance their properties. Ultrasonic pre-treated wood biochar has showcased efficient surface and adsorption properties. Iron impregnated biochar is interesting as it has potentially proved the efficiency as an efficient low-cost catalyst. In this study, by combining the advantages of ultrasonic pre-treatment and iron impregnation, we have synthesized a series of Fe-impregnated biochar from softwood chips. Pre- and post-pyrolysis methods using a lab-scale pyrolyser had been implemented to compare the pyrolysis product yields and degree of impregnation. Biochars derived from ultrasound pre-treated woodchips by post pyrolysis demonstrated better impregnation of Fe ions on surface with better distribution of pyrolysis products such as biochar and biogas. The surface functionality of all ultrasound pre-treated biochars remained the same. However, post-pyrolysed samples at high frequency ultrasound pre-treatment showed better thermal stability. The chemical characteristics of these modified biochars are interesting and can indeed be used as a cost-effective replacement for various catalytic applications.

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Section: Resultssupporting

confidence: 55%

Section: Effect Of Impregnation On Biochar Surface Elemental Compositioncontrasting

confidence: 65%

Section: Effect Of Iron Impregnation On Pyrolysis Product Yieldssupporting

confidence: 52%

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Pre- and post-pyrolysis effects on iron impregnation of ultrasound pre-treated softwood biochar for potential catalysis applications

2021

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“…They start from 62.45, 63.15, 63.45, and 64.45 wt% at 200 8C to 67.48, 68.99, 75.45, and 78.45 wt% at 700 8C, for PSB, WSB, SSB, and EB wastes, respectively. From literature point of view, it has been known that temperature of pyrolysis plays an important and viable role in conversion degree and distribution of bio-oil, bio-char and gas products (Chen et al, 2014;Dai et al, 2019;Duan et al, 2020;Klass et al, 2020;Mullen et al, 2010). At lower temperature, between 100 and 160 8C, agricultural biomass samples lose their moisture, undergo degradation reactions involving no carbohydrate loss, and generate non-combustibles gases like CO 2 .…”

Section: Pyrolysis Of Agricultural Biomass Wastes and Product Yieldsmentioning

confidence: 99%

“…Klaas et al (2020), studied effects of torrefaction pre-treatment on pyrolysis of corn cobs employing a continuous fluidized bed reactor, they have found the greatest liquid product yield of 51.7% achieved at 450 8C (Klaas et al, 2020). Other works (Chen et al, 2014;Dai et al, 2019;Duan et al, 2020;Ioannidou et al, 2009;Mullen et al, 2010;Phuakpunk et al, 2020;Watt et al, 2020), have showed that wastes in general and especially agricultural biomass wastes offer a good opportunity to generate a new renewable source of energy.…”

Section: Introductionmentioning

confidence: 99%

Biofuels and biochars production from agricultural biomass wastes by thermochemical conversion technologies: Thermogravimetric analysis and pyrolysis studies

et al. 2021

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In this paper, thermal degradation (TGA) and pyrolysis studies of sunflower shell biomass (SSB), eucalyptus biomass (EB), wheat straw biomass (WSB), and peanut shell biomass (PSB) were carried out using the thermogravimetric analysis and stainless steel tubular reactor. Thermal degradation of all biomass wastes was examined at a heating rate of 10 °C/min in nitrogen atmosphere between 20 and 800 °C. Experiments of pyrolysis were carried out in a tubular reactor from 300 to 700 °C with a heating rate of 10 °C/min, a particle size of 0.1–0.3 mm and nitrogen flow rate of 100 mL.min−1, which the aim to study how temperature affects liquid, solid, and gas products. The results of this work showed that three stages have been identified in the thermal decomposition of SSB, EB, WSB, and PSB wastes. The first stage occurred at 120–158 °C, the second stage, which corresponds to hemicellulose and cellulose's degradation, occurred in temperatures range from 139 to 480 °C for hemicellulose, and from 233 to 412 °C for cellulose, while the third stage occurred at 534–720 °C. It was concluded that temperature has a significant effect on product yields. The maximum of bio-oil yields of 37.55, 30.5, 46.96, and 50.05 wt% for WSB, PSB, SSB, and EB, were obtained at pyrolysis temperature of 500 °C (SSB, PSB, and WSB) and 550 °C (EB). Raw biomass, solid and liquid products obtained were characterized by elemental analysis, Fourier transformed infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), and x-ray diffraction (XRD). The analysis of solid and liquid products showed that bio-oils and bio-chars from agricultural biomass wastes could be prospective sources of renewable fuels production and value added chemical products.

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A meta‐analysis on the impacts of different oxidation methods on the surface area properties of biochar

et al. 2022

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Biochar has a beneficial impact on agricultural prosperity, according to numerous studies, and the key dispute presently is how to maximize that impact. Biochar oxidation is well‐known as one of the accepted methods for increasing biochar efficiency. However, due to contradictory data presented in studies and because biochar is derived from diverse oxidation procedures, as well as, the lack of an analytical comparison between different methods, oxidation data sets require a thorough assessment that can be covered by meta‐analysis. In this study, the effects of the five most common oxidation methods in the literature, namely oxidation by acids, alkaline, metal oxides, physical, and natural oxidation, on the cation exchange capacity (CEC), micro‐pores (MP), specific surface area (SSA), and oxygen‐content functional groups (OFGs) of biochar, were meta‐analyzed. When pyrolysis conditions varied, the efficiency of various operations was also addressed. The most efficient method was acidic oxidation, which increased CEC, SSA, MP, and OFGs by 46%, 43%, 55%, and 72%, respectively. Additionally, increasing the pyrolysis temperature above 550°C is critical for lowering OFGs, which has an impact on biochar sorption characteristics. According to the findings, biochar oxidation (post‐pyrolysis) is important since it creates more oxide ions on the surface area than feedstock oxidation (pre‐pyrolysis). Due to their high inorganic nutrient content, crop residues such as rice husk, maize stalk, and rapeseed stem, which were classed in the intermediate group in this study, are promising feedstocks for synthesizing biochars with high SSA, MP, and CEC. Overall, when compared to other approaches, the acidic process significantly improves the surface properties of biochar.

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Microwave-assisted catalytic pyrolysis of torrefied corn cob for phenol-rich bio-oil production over Fe modified bio-char catalyst

Cited by 68 publications

References 32 publications

Pre- and post-pyrolysis effects on iron impregnation of ultrasound pre-treated softwood biochar for potential catalysis applications

Pre- and post-pyrolysis effects on iron impregnation of ultrasound pre-treated softwood biochar for potential catalysis applications

Biofuels and biochars production from agricultural biomass wastes by thermochemical conversion technologies: Thermogravimetric analysis and pyrolysis studies

A meta‐analysis on the impacts of different oxidation methods on the surface area properties of biochar

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