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Preparation of Ce–Mn/Fe 2 O 3 Catalysts for Steam Catalytic Cracking of Coal Tar
Author(s) -
Yao Demeng,
Wang Dechao,
Jin Lijun,
Li Yang,
Yang He,
Wang Tingting,
Hu Haoquan
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802845
Subject(s) - catalysis , space velocity , tar (computing) , fluid catalytic cracking , coal tar , cracking , steam reforming , materials science , oxygen , chemistry , yield (engineering) , chemical engineering , coal , metallurgy , organic chemistry , composite material , selectivity , hydrogen production , computer science , engineering , programming language
Steam catalytic cracking is an alternative method to produce light tar fractions from coal tar. In this study, Mn−Ce modified Fe 2 O 3 catalysts were prepared by impregnation method, and used for steam catalytic cracking of coal tar in a fixed‐bed reactor at 550 °C and atmospheric pressure. The results showed that the catalyst Fe80Mn15Ce5 (Fe/Mn/Ce mole ratio 80/15/5) exhibits the best performance in terms of highest light tar yield being 67.6 wt.%. Moreover, the decrease of weight hourly space velocity ( WHSV ) can further increase the pitch conversion and the light tar content. As a result, when the WHSV is 0.65 h −1 , the light tar yield reaches 71.6 wt.% on Fe80Mn15Ce5. The structural variations of catalysts were characterized by several analytical techniques to reveal the improved catalytic performance. It is shown that the impregnation of MnO x improves the structural stability of Fe 2 O 3 due to the formation of Fe−Mn solid solution, while the load of CeO x activates lattice oxygen. As a result, more active oxygen species generating from steam dissociation can participate in the catalytic upgrading of coal tar.