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Author: search.filters.author.Yoshikawa, TakuyaSubject: search.filters.subject.Iron oxide catalyst

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    Oxidative cracking of aromatic compounds related to lignin constituents with steam using ZrO2-Al2O3-FeOx catalyst
    (2010-10-22)
    Yoshikawa, Takuya
    ;
    Na-Ranong, Duangkamol
    ;
    Tago, Teruoki
    ;
    Masuda, Takao
    The catalytic activity of iron oxide composite catalyst (ZrO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO<inf>x</inf>) was investigated for converting aromatic compounds derived from plant biomass into useful aromatics. Catalytic cracking of lignin constituent-related di-aroatics such as diphenyl ether, diphenyl methane, and 2-benzyloxyphenol, and mono-aromatics such as guaiacol, acetophenone, and 1-phenyl-1-propanol was carried out over ZrO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO<inf>x</inf>. The catalytic reactions were conducted in a fixed-bed reactor at 773 K under atmospheric pressure. Diphenyl ether and diphenyl methane were stable, whereas 2-benzyloxyphenol was thermally decomposed, followed by the production of toluene and phenol over ZrO<inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO <inf>x</inf>. Guaiacol and acetophenone were selectively converted into 54 C-mol% of phenol and 29 C-mol% of benzene, respectively. The methoxy and carbonyl groups were decomposed into gaseous products mainly consisting of CO<inf>2</inf>, whereas dehydration of the aliphatic hydroxyl group in 1-phenyl-1-propanol mainly occurred to produce 1-phenyl-1-propene. ZrO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO<inf>x</inf> catalyst is effective for degrading alkyl ether bonds between aromatic rings, and the ring substituent methoxy and carbonyl groups.