Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 168, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2022.105698
Keywords
Low-rank coal; Low-density polyethylene; Co-pyrolysis; In-situ Py-TOF-MS; Mixing configuration
Funding
- National Natural Science Foundation of China [22078053]
- Dalian Innovation Team Support Plan in Key Areas of Dalian ST Bureau [2019RT10]
- Fundamental Research Funds for the Central Universities [DUT2021TB03]
- Liaoning Revitalization Talent Program [XLYC1908033]
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The co-pyrolysis mechanism of Pingshuo coal and low-density polyethylene was explored using in-situ pyrolysis time-of-flight mass spectrometry with vacuum ultraviolet photoionization and electron para-magnetic resonance. The results showed that different mixing configurations had a significant impact on the release of volatiles.
The real-time detection of volatiles is crucial for exploring co-pyrolysis mechanisms. In this study, the co -pyrolysis interaction mechanism of Pingshuo coal (PC) and low-density polyethylene (LDPE) with three varied mixing configurations was explored based on the product distribution and stable radicals in char by using in-situ pyrolysis time-of-flight mass spectrometry with vacuum ultraviolet photoionization as well as electron para-magnetic resonance. Total ion currents results show that mixing configurations have an obvious impact on the release of volatiles. In the coal-LDPE test, the volatiles from coal promotes the cracking of long-chain branches in LDPE, resulting in high alkenes content. Meanwhile, the LDPE melts delay the release of coal volatiles causing a higher peak temperature of 478 ?. As for the LDPE-coal configuration, the LDPE volatiles has a better hydrogen -donor effect, which can interact with volatiles and char from coal pyrolysis to facilitate the formation of aro-matics and phenols. Comparatively, coal/LDPE configuration prompts the molten LDPE to coat coal particles and exhibits poor synergies between coal and LDPE. In addition, LDPE-coal char has higher spin concentrations of C-, and O-centered radicals, indicating that the released .H radicals from LDPE pyrolysis can well interact with char and unreleased volatiles in coal.
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