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  1. Article: Pyrolysis behavior of low-density polyethylene over HZSM-5 via rapid infrared heating

    Wu, Yunfei / Wang, Kechao / Wei, Baoyong / Yang, He / Jin, Lijun / Hu, Haoquan

    Science of the total environment. 2022 Feb. 01, v. 806

    2022  

    Abstract: Catalytic fast pyrolysis experiments of low-density polyethylene (LDPE) over HZSM-5 were carried out by using infrared heating technology. The effects of heating rate (1–30 °C/s), pyrolysis temperature (450–650 °C), and mass ratio of catalyst to LDPE (0: ... ...

    Abstract Catalytic fast pyrolysis experiments of low-density polyethylene (LDPE) over HZSM-5 were carried out by using infrared heating technology. The effects of heating rate (1–30 °C/s), pyrolysis temperature (450–650 °C), and mass ratio of catalyst to LDPE (0:100 to 50:100) on product distribution and oil composition in LDPE pyrolysis were investigated, and the fast pyrolysis mechanism was explored. The results indicated that a higher heating rate, namely 20 °C/s, can remarkably enhance the liquid oil yield (93.42%), but the oil is heavy due to about 90% high‑carbon n-aliphatics. The addition of HZSM-5 performed an excellent effect on obtaining high-quality liquid oils, among which the total content of monocyclic aromatic hydrocarbons (MAHs) and iso-aliphatics obviously increase from 0.68% to 70.26%. The optimal HZSM-5/LDPE ratio of 10:100 was identified by considering the cost-effective factor. Furthermore, the lower catalytic temperature is favorable to the generation of light oil components, especially MAHs. The feasible generation paths were proposed, which mainly derived from the secondary reaction of the intermediate formed by initial chain cleavage including cyclization, aromatization, Diels-Alder reaction, as well as isomerization.
    Keywords aromatization ; catalysts ; cleavage (chemistry) ; cost effectiveness ; cycloaddition reactions ; environment ; heat ; isomerization ; liquids ; oils ; polyethylene ; pyrolysis ; temperature
    Language English
    Dates of publication 2022-0201
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2021.151287
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Enhanced co-pyrolysis synergies between cedar and Naomaohu coal volatiles for tar production

    Zhu, Jialong / Zhao, Shun / Wei, Baoyong / Xu, Ji / Hu, Haoquan / Jin, Lijun

    Journal of analytical and applied pyrolysis. 2021 Nov., v. 160

    2021  

    Abstract: Tar production from co-pyrolysis is highly dependent on synergies between coal and biomass volatiles. Therefore, enhancing their interactions during co-pyrolysis is crucial. In this study, three mixing modes, including mechanical mixing (M-type) and two ... ...

    Abstract Tar production from co-pyrolysis is highly dependent on synergies between coal and biomass volatiles. Therefore, enhancing their interactions during co-pyrolysis is crucial. In this study, three mixing modes, including mechanical mixing (M-type) and two layered loading modes (the U-type with upper Naomaohu coal (NMH) and lower cedar sawdust (CS) and the L-type with upper CS and lower NMH), were specially designed to explore the synergies between NMH and CS volatiles based on the analyses of products distribution, tar fractions and compositions, and stable radicals in char. The results show that sufficient void space is required for the co-pyrolysis synergies between CS and NMH volatiles. With the M-type mode, the CS volatiles preferably formed char on the NMH surface in a limited void space, inhibiting coal pyrolysis. The layered L-type and U-type modes enhanced the co-pyrolysis synergies, and the CS volatiles acted as hydrogen donors to enhance tar production. Compared with the L-type mode, the U-type mode resulted in better synergies between NMH and CS volatiles, contributing to higher tar yield of 44.68 wt%. In addition, the volatile synergies were conductive to the formation of aliphatic chain radicals in char, methyl-containing compounds, and 3–4 ring aromatic compounds in tar. This research will guide the optimization of tar production and co-pyrolysis technique exploitation.
    Keywords biomass ; coal ; hydrogen ; pyrolysis ; sawdust
    Language English
    Dates of publication 2021-11
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0165-2370
    DOI 10.1016/j.jaap.2021.105355
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  3. Article ; Online: Pyrolysis behavior of low-density polyethylene over HZSM-5 via rapid infrared heating.

    Wu, Yunfei / Wang, Kechao / Wei, Baoyong / Yang, He / Jin, Lijun / Hu, Haoquan

    The Science of the total environment

    2021  Volume 806, Issue Pt 3, Page(s) 151287

    Abstract: Catalytic fast pyrolysis experiments of low-density polyethylene (LDPE) over HZSM-5 were carried out by using infrared heating technology. The effects of heating rate (1-30 °C/s), pyrolysis temperature (450-650 °C), and mass ratio of catalyst to LDPE (0: ... ...

    Abstract Catalytic fast pyrolysis experiments of low-density polyethylene (LDPE) over HZSM-5 were carried out by using infrared heating technology. The effects of heating rate (1-30 °C/s), pyrolysis temperature (450-650 °C), and mass ratio of catalyst to LDPE (0:100 to 50:100) on product distribution and oil composition in LDPE pyrolysis were investigated, and the fast pyrolysis mechanism was explored. The results indicated that a higher heating rate, namely 20 °C/s, can remarkably enhance the liquid oil yield (93.42%), but the oil is heavy due to about 90% high‑carbon n-aliphatics. The addition of HZSM-5 performed an excellent effect on obtaining high-quality liquid oils, among which the total content of monocyclic aromatic hydrocarbons (MAHs) and iso-aliphatics obviously increase from 0.68% to 70.26%. The optimal HZSM-5/LDPE ratio of 10:100 was identified by considering the cost-effective factor. Furthermore, the lower catalytic temperature is favorable to the generation of light oil components, especially MAHs. The feasible generation paths were proposed, which mainly derived from the secondary reaction of the intermediate formed by initial chain cleavage including cyclization, aromatization, Diels-Alder reaction, as well as isomerization.
    MeSH term(s) Biofuels ; Catalysis ; Heating ; Hot Temperature ; Polyethylene ; Pyrolysis
    Chemical Substances Biofuels ; Polyethylene (9002-88-4)
    Language English
    Publishing date 2021-10-28
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2021.151287
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  4. Article: Oxidative Catalytic Cracking and Reforming of Coal Pyrolysis Volatiles over NiO

    Wang, Dechao / Jin, Lijun / Wei, Baoyong / Lv, Jiannan / Li, Yang / Hu, Haoquan

    Energy & fuels. 2020 May 14, v. 34, no. 6

    2020  

    Abstract: Catalytic cracking of Pingshuo (PS) coal pyrolysis volatiles was investigated over NiO on a two-stage fixed bed reactor. The effect of the NiO loading amount and catalytic upgrading temperature on the products distribution was investigated, and the role ... ...

    Abstract Catalytic cracking of Pingshuo (PS) coal pyrolysis volatiles was investigated over NiO on a two-stage fixed bed reactor. The effect of the NiO loading amount and catalytic upgrading temperature on the products distribution was investigated, and the role of NiO during the catalytic upgrading was discussed through several characterizations. It is shown that the partial reduced NiO to Ni during catalytic cracking results in oxidative catalytic cracking and reforming of coal pyrolysis volatiles. The tar yield decreases from 14.2 wt % without using NiO to 3.6 wt % with 9.0 g NiO loading at a cracking temperature of 550 °C, corresponding to the tar conversion being 74.6 wt %. With the increase of the cracking temperature, the tar yield decreases first and then increases, and the lowest tar yield is 5.2 wt % at 550 °C over 6 g NiO loading. After catalytic cracking of coal pyrolysis volatiles, the used NiO is fully reduced to Ni, and the catalytic performance of used NiO was evaluated three times. The results indicate that the NiO-2nd (used NiO) shows high tar reforming performance in terms of the decrease of tar (10.7 wt %) and water yield (4.8 wt %), and H₂ yield increases significantly to 104 mL/g coaldₐf at 550 °C compared to those without using NiO. However, the catalytic performance of used NiO decreases gradually with increase of cycle times; the tar and water yield increase to 13.3 and 7.4 wt %, respectively, and H₂ yield decreases to 31 mL/g coaldₐf over NiO-4th. The gradual decrease of catalytic performance of used NiO is due to the deposition of carbon and formation of Ni₂S₃.
    Keywords carbon ; catalytic activity ; coal ; energy ; nickel oxide ; pyrolysis ; temperature ; water yield ; yields
    Language English
    Dates of publication 2020-0514
    Size p. 6928-6937.
    Publishing place American Chemical Society
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1483539-3
    ISSN 1520-5029 ; 0887-0624
    ISSN (online) 1520-5029
    ISSN 0887-0624
    DOI 10.1021/acs.energyfuels.0c00771
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  5. Article: Effect of reducibility of transition metal oxides on in-situ oxidative catalytic cracking of tar

    Wang, Dechao / Jin, Lijun / Li, Yang / Wei, Baoyong / Yao, Demeng / Hu, Haoquan

    Energy conversion and management. 2019 Oct. 01, v. 197

    2019  

    Abstract: To understand the effect of reducibility of transition metal oxides (TMOs) on tar conversion, four TMOs including Fe₂O₃, MnOₓ, CuO, and NiO were selected and in-situ oxidative catalytic cracking of coal pyrolysis tar on a two-stage fixed bed reactor at ... ...

    Abstract To understand the effect of reducibility of transition metal oxides (TMOs) on tar conversion, four TMOs including Fe₂O₃, MnOₓ, CuO, and NiO were selected and in-situ oxidative catalytic cracking of coal pyrolysis tar on a two-stage fixed bed reactor at 550 °C was performed. The reducibility of TMOs was measured by H₂-temperature programmed reduction (H₂-TPR). The effect of reducibility of TMOs on the pyrolysis products distribution and conversion was investigated. The changes of TMOs before and after reaction were also analyzed by several characterizations. The addition of TMOs results in the decrease of tar yield and heavy tar content, and the increase of gas yield. The reduction temperature of TMOs affects the products distribution and heavy tar conversion. Among these four TMOs, Fe₂O₃ shows the highest reduction temperature (390–700 °C with peak centered on 570 °C) and the largest heavy tar conversion (75.3 wt%). CuO shows the lowest reduction temperature (190–470 °C with peak centered on 326 °C) and heavy tar conversion (45.8 wt%). The main reactions on CuO is complete oxidation with high water yield (12.8 wt%) and CO₂ formation (110 mL/g.coaldₐf). The coke formed on the used Fe₂O₃ is amorphous or disordered carbon, and shows the largest yield being 5.5 wt%.
    Keywords administrative management ; carbon ; carbon dioxide ; catalytic cracking ; coal ; energy conversion ; exhibitions ; nickel oxide ; oxidation ; pyrolysis ; temperature ; water yield
    Language English
    Dates of publication 2019-1001
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2019.111871
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