EXAFS Study on Structural Change of Charcoal-supported Ruthenium Catalysts during Lignin Gasification in Supercritical Water

• Published in: Catalysis letters Vol. 122; no. 1-2; pp. 188 - 195
• Main Authors: Yamaguchi, Aritomo, Hiyoshi, Norihito, Sato, Osamu, Osada, Mitsumasa, Shirai, Masayuki
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.04.2008; Springer; Springer Nature B.V
• Subjects: Catalysis; Catalysts; Charcoal; Chemistry; Chemistry and Materials Science; Exact sciences and technology; Gasification; General and physical chemistry; Industrial Chemistry/Chemical Engineering; Lignin; Metal particles; Organometallic Chemistry; Physical Chemistry; Ruthenium trichloride; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Lignin gasification; Metal particle; Supercritical water; EXAFS; Supported ruthenium catalyst; Water; Lignin; Ruthenium; Support; Transition metal; Supercritical state; Carbon; Supported catalyst; EXAFS spectrometry; Particle; Heterogeneous catalysis; Lignin gasification .Supercritical water; Gasification; Platinoid; Charcoal; Supported ruthenium catalyst .EXAFS .Metal particle
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-007-9368-2

Lignin gasification in supercritical water over charcoal supported ruthenium trivalent salts was studied using a batch reactor at 673 K. Ruthenium (III) nitrosyl nitrate on charcoal (Ru(NO)(NO 3 ) 3 /C) was more active than ruthenium (III) chloride on charcoal (RuCl 3 /C) for the gasification reaction. EXAFS analysis revealed that ruthenium metal particles were formed in both RuCl 3 /C and Ru(NO)(NO 3 ) 3 /C catalysts during the lignin gasification and that the size of ruthenium metal in Ru(NO)(NO 3 ) 3 /C was smaller than that in RuCl 3 /C. It was concluded that well-dispersed ruthenium metal particles were active for the lignin gasification in supercritical water.