title: Catalytic decomposition of 4-phenoxyphenol to aromatics over Pd/Cs(x)H3.0-x PW12O40/activated carbon aerogel (X = 2.0-3.0).
abstract: Cesium-exchanged heteropolyacid (Cs(x)H3.0-xPW12O40) was impregnated onto activated carbon aerogel (ACA) with a variation of cesium content (X = 2.0, 2.3, 2.5, 2.7, and 3.0) in order to provide acid sites to ACA. Palladium catalysts were then supported on Cs(x)H3.0-xPW12O40-impregnated activated carbon aerogel (Pd/Cs(x)H3.0-xPW12O40/ACA, X = 2.0-3.0) by an incipient wetness impregnation method for use in the decomposition of lignin model compound to aromatics. 4-Phenoxyphenol was used as a lignin model compound for representing 4-O-5 linkage of lignin. In the catalytic decomposition of 4-phenoxyphenol over Pd/Cs(X)H3.0-xPW12O40/ACA, cyclohexanol, benzene, and phenol were mainly produced. Conversion of 4-phenoxyphenol and total yield for main products (cyclohexanol, benzene, and phenol) were closely related to the acidity of Pd/Cs(x)H3.0-xPW12O40/ACA. Conversion of 4-phenoxyphenol and total yield for main products increased with increasing acidity of Pd/Cs(x)H3.0-xPW12O40/ACA. Among the catalysts tested, Pd/Cs2.5H0.5PW12O40/ACA catalyst with the largest acidity showed the highest conversion of 4-phenoxyphenol and total yield for main products. Therefore, it is concluded that acidity of catalysts would be an important factor determining the catalytic performance in the decomposition of 4-phenoxyphenol.
authors.affiliation: School of Chemical and Biological Engineering, Institute of Chemical Processes, World Class University Program of Chemical Convergence for Energy and Environment, Seoul National University, Shinlim-dong, Kwanak-Ku, Seoul 151-744, South Korea.
authors.forename: Hai Woong
authors.initials: HW
authors.lastname: Park
authors.forename: Ung Gi
authors.initials: UG
authors.lastname: Hong
authors.forename: Yoon Jae
authors.initials: YJ
authors.lastname: Lee
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Choi
authors.forename: In Kyu
authors.initials: IK
authors.lastname: Song
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002586:Cesium / Q000737:chemistry*; D005782:Gels; D046529:Microscopy, Electron, Transmission; D010165:Palladium / Q000737:chemistry*; D010647:Phenyl Ethers / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D005782:Gels; D010647:Phenyl Ethers; D002586:Cesium; D010165:Palladium; D002244:Carbon; C530483:4-phenoxyphenol