Effect of coal ranks on light aromatics production during reforming of pyrolysis volatiles over HZSM-5 under Ar and H2-assisted atmospheres

Ren, Xue-Yu; Zhao, Shi-Xuan; Cao, Jing‐Pei; Zhao, Xiao-Yan; Feng, Xiaobo; Yang, Li; Ji, Zhiming; Wang, Zhi-Hao; Bai, Hongcun

doi:10.1016/j.jaap.2020.104958

Cited by 23 publications

(17 citation statements)

References 64 publications

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“…The dried sample (1.0 g) was fed at a rate of 0.1 g/min in the pyrolytic zone with a temperature of 600 °C. Subsequently, the pyrolytic volatiles were introduced into the catalytic zone with a temperature of 600 °C for the hydrocracking to produce light aromatics for a residence time of 1.0 s under a H 2 atmosphere . The exit of the reactor was used directly for the product separation and collection.…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, the pyrolytic volatiles were introduced into the catalytic zone with a temperature of 600 °C for the hydrocracking to produce light aromatics for a residence time of 1.0 s under a H 2 atmosphere. 10 The exit of the reactor was used directly for the product separation and collection. In all the tests, the collected liquid and gas were analyzed by offline techniques, such as gas chromatography−mass spectrometry (GC−MS) and GC.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Fast pyrolysis was performed in the presence of H 2 to promote the hydrodeoxygenation of the oxygenated compounds in biotar. Catalytic reforming assisted by HZSM-5 is attractive for the decarbonylation, decarboxylation, and dehydration of the oxygenated compounds to produce light aromatics and olefins …”

Section: Introductionmentioning

confidence: 99%

“…Catalytic reforming assisted by HZSM-5 is attractive for the decarbonylation, decarboxylation, and dehydration of the oxygenated compounds to produce light aromatics and olefins. 10 The comprehensive understanding of the mechanism of the catalytic cracking of biomass is key to the progress of the fundamental research and to provide guidance for the industrial applications. So far, both the hydrocarbon pool and the phenolic pool mechanisms are reported to be responsible for the formation of aromatics and olefins during the catalytic pyrolysis of biomass and its derived compounds over HZSM-5.…”

Section: ■ Introductionmentioning

confidence: 99%

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Formation of Light Aromatics and Coke during Catalytic Reforming of Biopolymer-Derived Volatiles over HZSM-5

Ren

Cao

Yang

et al. 2021

Ind. Eng. Chem. Res.

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In this study, the formation mechanism of light aromatics including benzene, toluene, ethylbenzene, xylene, and naphthalene (BTEXN) and the coke growth during catalytic reforming of thermally derived volatiles of cellulose, glucose, and lignin over HZSM-5 under a H 2 atmosphere were investigated rigorously. The shape selectivity of HZSM-5 coupled with H 2 as the promoted agent was found to be highly efficient in trapping volatiles to promote the production of BTEXN. The reactivity of the three biopolymers from biomass structures was compared over HZSM-5 to reveal the hydrocarbon pool and the phenolic pool mechanisms, which are the key mechanistic steps for the BTEXN products and the undesired coke. The results of the present work indicated that there are competing adsorption between the reactions of the aromatics formation and the reactions responsible for the catalytic coke. The formation of both the "soft" and the "hard" coke species strongly depends on biomass structures. The main coke species on spent HZSM-5 are polyaromatics formed via ring growth and the heavy aliphatic species with longer chain (C 10 −C 30 ) formed via chain growth of the C 6 −C 10 oligomers. By analyzing the coke location and the coke nature, we proposed the coke growth mechanism in terms of the aliphatic-based cycle and the aromatic-based cycle.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Formation of Light Aromatics and Coke during Catalytic Reforming of Biopolymer-Derived Volatiles over HZSM-5

Ren

Cao

Yang

et al. 2021

Ind. Eng. Chem. Res.

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“…As a low rank bituminous coal, HSW coal selected in this work has a higher weight loss rate, because the carbon content in vitrinite is very low, only 79.15% [31] . Coal samples with low carbon content can be converted into low molecular products more quickly, especially the lower C/H in raw coal sample, the higher pyrolysis conversion rate of coal sample, and the corresponding increase of tar yield [32,33] .…”

Section: Slow Polycondensation Stagementioning

confidence: 99%

Pyrolysis Reactive Behaviors and Kinetic Characteristics of HSW Vitrinite Coal based on Coats-Redfern and DAEM Models

Wang¹,

Wang²,

Li³

et al. 2021

Preprint

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In this work, the weight loss behavior of vitrinite in hongshiwan coal at different heating rates was investigated by thermogravimetric mass spectrometry (TG-MS). Then Coats-Redfern and DAEM models were established to analyze the kinetics of coal pyrolysis. The results show that the weight loss rate of pyrolysis decreased with the increase of heating rate. When the pyrolysis temperature reaches 400–500°C, the weight loss rate reaches the maximum, which is 0.1593, 0.1539, 0.1478 and 0.1414%/°C respectively at the heating rates of 5, 10, 15 and 20°C/min, With the increase of heating rate, the corresponding temperature peaks of the five pyrolysis gases are shifted to the high temperature direction, and the amount of gas escaping is increasing. The trend of higher heating rate delayed the release of volatile compounds was consistent with TG-DTG results. Two kinetic models both prove that the activation energy of coal pyrolysis increases with the increase of temperature. The maximum activation energy occurs between 600 ℃ and 900 ℃, because the multi condensation of coal tar and the re solidification of semi coke will occur in this temperature range.

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Optimizing support acidity of NiMo catalysts for increasing the yield of benzene, toluene and xylene in tetralin hydrocracking

Chen,

Huo,

Zhao

et al. 2023

Front. Chem. Sci. Eng.

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Effect of coal ranks on light aromatics production during reforming of pyrolysis volatiles over HZSM-5 under Ar and H2-assisted atmospheres

Cited by 23 publications

References 64 publications

Formation of Light Aromatics and Coke during Catalytic Reforming of Biopolymer-Derived Volatiles over HZSM-5

Formation of Light Aromatics and Coke during Catalytic Reforming of Biopolymer-Derived Volatiles over HZSM-5

Pyrolysis Reactive Behaviors and Kinetic Characteristics of HSW Vitrinite Coal based on Coats-Redfern and DAEM Models

Optimizing support acidity of NiMo catalysts for increasing the yield of benzene, toluene and xylene in tetralin hydrocracking

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