Study on catalytic co-pyrolysis of physical mixture/staged pyrolysis characteristics of lignite and straw over an catalytic beds of char and its mechanism

Zhao, Hongyu; Song, Qiang; Liu, Shucheng; Li, Yuhuan; Wang, Xiaohua; Shu, Xinqian

doi:10.1016/j.enconman.2018.01.083

Cited by 151 publications

(38 citation statements)

References 44 publications

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“…Peak area ratio of the Raman spectrum curve‐fitting of the BC and ABC samples are shown in Figure . At present, the peak area ratios of D and G are often used to study the crystal structure and functional groups of carbon materials, and it is considered that the area ratio decreased with the increase of graphitization degree. The peak area ratio of D to G R + V L + V R is often used to determine the aromatic ring structure of ≥6 rings and the aromatic ring structure of amorphous carbon containing 2‐8 rings or more .…”

Section: Resultsmentioning

confidence: 99%

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO ₂ capture

Quan

Gao

2020

Int J Energy Res

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Summary Biomass based carbon has captured more and more attention because it is environmentally friendly and has properties of low cost and ideal sustainability. In this study, three kinds of activated biomass carbons (ie, ABC‐700, ABC‐800 and ABC‐900) were first carbonized through pine sawdust pyrolysis and then activated using KOH under three different activation temperatures (ie, 700°C, 800°C and 900°C). The structure properties of the prepared activated biomass carbons were characterized by N2‐adsorption/desorption, SEM, TEM, XRD, Raman, XPS, TG and ultimate analysis. To clarify the activation mechanism, the gas products produced during KOH activation process were measured online with an ETG gas analyzer. The performance of the activated biomass carbons derived from pine sawdust for supercapacitor and CO2 capture was then evaluated. The predominant gas products during the activation process are H2 and CO. It indicates that the porous structure was created by using an enhanced etching reaction between carbon atoms and KOH. An increment of the activation temperature from 700 to 900°C results in the increase of surface area (from 1728.66 to 2330.89 m2/g) and total pore volume (from 0.671 to 1.914 cm3/g). Among the three samples, ABC‐900 exhibits the maximal specific capacitance of 175.6 F·g−1 and high energy density of 24.39 Wh·kg−1 at the 0.5 A·g−1. And the ABC‐700 shows the maximal CO2 capture capacity of 4.21 mmol/g and high selectivity of CO2 over N2 at 298 K and 1 bar. In addition, ABC‐700 also has excellent stability and reproducibility after 15 times adsorption‐desorption cycles. The unexceptionable electrochemical performance and adsorption capacity of the biomass‐carbons show its broad application prospects in the field of supercapacitors and CO2 capture.

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Section: Resultsmentioning

confidence: 99%

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO ₂ capture

Quan

Gao

2020

Int J Energy Res

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“…The O atoms on the impurities' surfaces are represented by the two characteristic peaks for -OH and C-O, again in increasing BE order, as well as peaks for Si(OH) 4 and Al(OH) 3 species present in the admixed kaolinite ( Figure 3). Based on binding energy (BE) and peak attribute reference data for C 1s [22][23][24][25] and O 1s [26,27], the XPSPEAK4.1 program was used for C 1s and O 1s peak fitting, with the results shown in Figures 2 and 3, respectively. The C atoms on the surface of the kaolinitic carbon impurities existed mainly in the forms of C-C, C-H, C-O, CiO, and COO-structures.…”

Section: Discussionmentioning

confidence: 99%

Density Functional Theory Analysis of the Adsorption Interactions of Carbon Impurities in Coal-associated Kaolinite

Liu

Min

et al. 2019

Processes

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Kaolinite is a difficult-to-float clay existing in coal slurries which negatively impacts coal flotation. A better understanding of its adsorption behavior would improve coal-slurry processing. Carbon impurities in the kaolinite can affect this behavior. The appearance and elemental surface composition of the carbon impurities precipitated by kaolinite oxidative treatment were microscopically analyzed, and their chemical speciation and relative C and O contents were probed. The mechanisms of adsorption on the main kaolinite cleavage planes ((001) and (001) surfaces) for two carbon-impurity structural models, a phenolic hydroxyl unit (Ph–OH) and carbon hydroxyl unit (C–OH), were considered using density functional theory methods. The carbon impurities consisted mainly of C and O, with C present mostly as C–C, C–H, and C–O species, and O existing mainly in –OH and C–O structures. Both Ph–OH and C–OH units adsorbed stably on the kaolinite (001) and (001) surfaces through hydrogen bonding between the hydroxyl groups and surfaces. A strong electrostatic attraction occurred between the Ph–OH benzene ring and kaolinite surfaces, whereas the carbon ring in C–OH did not interact with either surface. Finally, for both units, adsorption on the kaolinite (001) surface was more stable than on the (001) surface.

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“…At present, many scholars had done Emany researches from the following aspects: the raw material pretreatment process (drying pretreatment, acid treatment, alkali treatment, torrefaction pretreatment, and nitrogen‐rich pretreatment), microwave‐assisted pyrolysis process, and hydrogen reagents (hydrogen methanol, waste plastic, methane, lignite, waste types, waste oil, etc. ) synergetic catalytic copyrolysis process and pyrolysis process parameters (reaction temperature, weight hourly space velocity, retention time, feed rate, silicon to aluminum ratio of catalyst, ratio of catalyst to biomass, gas flow rate, types of pyrolyzer, and fixed bed height) and achieved great results. However, due to the different sources of biomass, the content of each component was uneven, and the reaction was complex in the process of pyrolysis, which makes it very difficult to study the reaction mechanism of different biomass catalytic pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Catalytic copyrolysis of metal impregnated biomass and plastic with Ni‐based HZSM‐5 catalyst: Synergistic effects, kinetics and product distribution

et al. 2020

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The present work aims to investigate the thermal behavior, kinetics, thermodynamics, and product distribution during copyrolysis of transition metal salt (Ni, Co, Zn, Cu, and Fe)-added biomass and model compounds with low density polyethylene(LDPE) over a Ni-based HZSM-5 catalyst by TGA and fixed bed reactor. The interactions and reaction mechanisms during copyrolysis were evaluated. The influence of Ni-impregnated biomass (C-M) and Nimodified HZSM-5 (Ni/HZ) on the formation of pyrolysis bio-oil from biomass and model compounds and its subsequent effect on catalytic pyrolysis vapor upgrading was discussed. The results indicated that the presence of transition metal decreased the thermal degradation temperature and thermodynamics parameters; maximum decomposition rate, and reaction complexity. Ni/HZ catalyst could further decrease the activation energy, accelerate the reaction rate and change reaction process, and the modified samples/LDPE under copyrolysis with HZSM-5 catalyst presented a more significant effect than Ni/HZ catalyst. Subsequently, the Ea of pine, cellulose and lignin changed from 24.11, 18.29, and 28.68 kJ/mol (CP@Ni/HZ) to 56.04, 69.84, and 16.21 kJ/mol (CP-Ni@HZSM-5), respectively. In addition, Ni could inhibit the depolymerization of cellulose and promoted the formation of char, coke, and lignin derived phenolics. And Ni-impregnated biomass reduced the formation of desired aromatic hydrocarbons, but result in increasing of the char and non-condensable gases. But Ni/HZ catalysts promote the conversion of biomass to target products.

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Study on catalytic co-pyrolysis of physical mixture/staged pyrolysis characteristics of lignite and straw over an catalytic beds of char and its mechanism

Cited by 151 publications

References 44 publications

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO ₂ capture

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO ₂ capture

Density Functional Theory Analysis of the Adsorption Interactions of Carbon Impurities in Coal-associated Kaolinite

Catalytic copyrolysis of metal impregnated biomass and plastic with Ni‐based HZSM‐5 catalyst: Synergistic effects, kinetics and product distribution

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Study on catalytic co-pyrolysis of physical mixture/staged pyrolysis characteristics of lignite and straw over an catalytic beds of char and its mechanism

Cited by 151 publications

References 44 publications

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO 2 capture

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO 2 capture

Density Functional Theory Analysis of the Adsorption Interactions of Carbon Impurities in Coal-associated Kaolinite

Catalytic copyrolysis of metal impregnated biomass and plastic with Ni‐based HZSM‐5 catalyst: Synergistic effects, kinetics and product distribution

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Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO ₂ capture

Preparation of activated biomass carbon from pine sawdust for supercapacitor and CO ₂ capture