Lignin Depolymerization into Aromatic Monomers Using Supported Metal Catalysts in Supercritical Water

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  • YAMAGUCHI Aritomo
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST)
  • MIMURA Naoki
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST)
  • SEGAWA Atsushi
    Central Technical Research Laboratory, JXTG Nippon Oil & Energy Corp.
  • MAZAKI Hitoshi
    Central Technical Research Laboratory, JXTG Nippon Oil & Energy Corp.
  • SATO Osamu
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST)

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  • 担持金属触媒を用いた超臨界水中でのリグニン解重合反応による芳香族モノマーへの変換

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Abstract

<p>Lignin is a potentially useful source of aromatic monomers. Depolymerization of organosolv-lignin into aromatic monomers was investigated over charcoal-supported palladium, platinum, rhodium, or ruthenium catalyst (Pd/C, Pt/C, Rh/C, and Ru/C) in supercritical water (658-688 K) for reaction times of 0.5-3 h. Ru/C showed no catalytic activity for lignin depolymerization into aromatic monomers, but did catalyze conversion of lignin into gaseous products such as methane and carbon dioxide. In contrast, Pd/C, Pt/C, and Rh/C showed catalytic activity for lignin depolymerization into aromatic monomers. Yield of aromatic monomers decreased in the order Pd/C>Rh/C>Pt/C at 673 K and 1 h. Pd/C showed higher selectivity for phenolic aromatic monomers than Rh/C and Pt/C. Investigation of the activity of Pd/C at 673 K over time (0.5-3 h) found the highest yield of aromatic monomers (12.7 %) was obtained at 2 h.</p>

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