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The catalytic activity of iron oxide composite catalyst (ZrO2-Al2O3-FeOx) was investigated for converting aromatic compounds derived from plant biomass into useful aromatics. Catalytic cracking of lignin constituent-related di-aromatics 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 ZrO2-Al2O3-FeOx. 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 ZrO2-Al2O3-FeOx. 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 CO2, whereas dehydration of the aliphatic hydroxyl group in 1-phenyl-1-propanol mainly occurred to produce 1-phenyl-1-propene. ZrO2-Al2O3-FeOx catalyst is effective for degrading alkyl ether bonds between aromatic rings, and the ring substituent methoxy and carbonyl groups.酸化鉄複合触媒ZrO2-Al2O3-FeOx触媒を用いて植物バイオマス由来芳香族を有用芳香族へ転換するためにその触媒活性について検討した。リグニン構成物質関連芳香族化合物として2環芳香族化合物ジフェニルエーテルジフェニルメタン2-ベンジルオキシフェノールおよび単環芳香族化合物グアヤコールアセトフェノン1-フェニル-1-プロパノールを原料にZrO2-Al2O3-FeOx触媒を用いて接触分解を行った。反応実験は常圧の固定床流通式反応器を用いて行い反応温度773Kとした。2環芳香族化合物を原料とした実験ではジフェニルエーテルやジフェニルメタンは分解されず2-ベンジルオキシフェノールは熱分解の後ZrO2-Al2O3-FeOx触媒上での反応によりトルエンとフェノールが生成した。単環芳香族化合物を原料とした実験ではグアヤコールとアセトフェノンからフェノール54 C-mol%とベンゼン29 C-mol%がそれぞれ選択的に生成した。その際メトキシ基とカルボニル基の酸化分解により主にCO2が生成したが1-フェニル-1-プロパノールでは主に脂肪族水酸基の脱水反応が起こり1-フェニル-1-プロペンが生成した。したがって本触媒は芳香環どうしのアルキルエーテル結合および芳香環に結合するメトキシ基とカルボニル基の分解に有効であることが分かった

journal of the japan petroleum institute

Oxidative Cracking of Aromatic Compounds Related to Lignin Constituents with Steam Using ZrO&lt;sub&gt;2&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;–FeO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; Catalyst