Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 46, Issue 2, Pages 891-899Publisher
WILEY
DOI: 10.1002/er.7211
Keywords
catalytic fast pyrolysis; ex-situ catalysis; HZSM-5; low-rank coal; Mg; HZSM-5
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Funding
- National Research Foundation of Korea [NRF-2021R1A2C3011274]
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The catalytic effect of Mg/HZSM-5 in fast pyrolysis of low-rank coal and coal tar conversion was found to reduce total tar yield, increase the yield of light tar, and decrease the content of elements N and S in the resulting coal tars.
Catalytic effects in fast pyrolysis of low-rank coal and coal tar conversion were investigated in a two-stage fixed-bed reactor over HZSM-5 zeolite and Mg/HZSM-5. Mg/HZSM-5 caused the lower total tar yield and the higher non-condensable gas yield but the fraction of light tar (boiling point below 360 degrees C) increased to allow a slightly higher total yield of light tar. It also exhibited good catalytic activity and increased the species of light tar than HZSM-5 zeolite. The light tar fraction was increased from 45 to 74.6 wt% than without catalyst (66%) at the pyrolysis temperature of 600 degrees C. Ex-situ catalytic fast pyrolysis over Mg/HZSM-5 also lowered the contents of element N and S in the resulting coal tars by 29% and 15% respectively. The corresponding increase in the content of element H and molar ratio of H to C of the resulting coal tars was reported as 17% and 13% respectively. The addition of Mg into HZSM-5 increased the ability of the catalyst for inhibiting coke deposition.
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