Application of aluminum-supported Pd, Rh, and Rh-Pd nanoparticles in supercritical carbon dioxide system for hydrodebromination of polybrominated diphenyl ethers

Al-powder-supported Pd, Rh, and Rh-Pd catalysts were synthesized through a spontaneous redox reaction in aqueous solutions. These catalysts hydrodebrominated 4- and 4,4′-bromodiphenyl ethers in supercritical carbon dioxide at 200 atm CO2 containing 10 atm H2 and 80 °C in 1 h. Diphenyl ether was the...

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Veröffentlicht in:	Chemosphere (Oxford) 2016-08, Vol.157, p.115-123
Hauptverfasser:	Wu, Ben-Zen, Sun, Yu-Jie, Chen, Yan-Hua, Yak, Hwa Kwang, Yu, Jya-Jyun, Liao, Weisheng, Chiu, KongHwa, Peng, Shie-Ming
Format:	Artikel
Sprache:	eng
Schlagworte:	Aluminum Aluminum - chemistry Carbon Dioxide - chemistry Catalysis Halogenated Diphenyl Ethers - analysis Halogenated Diphenyl Ethers - chemistry Hydrocarbons, Brominated - analysis Hydrocarbons, Brominated - chemistry Hydrogenation Metal Nanoparticles - chemistry Nanoparticles Oxidation-Reduction Palladium - chemistry Polybrominated diphenyl ethers Powders Rhodium - chemistry Supercritical carbon dioxide Water Pollutants, Chemical - analysis Water Pollutants, Chemical - chemistry
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Zusammenfassung:	Al-powder-supported Pd, Rh, and Rh-Pd catalysts were synthesized through a spontaneous redox reaction in aqueous solutions. These catalysts hydrodebrominated 4- and 4,4′-bromodiphenyl ethers in supercritical carbon dioxide at 200 atm CO2 containing 10 atm H2 and 80 °C in 1 h. Diphenyl ether was the major product of Pd/Al. Rh/Al and Rh-Pd/Al further hydrogenated two benzene rings of diphenyl ether to form dicyclohexyl ether. The hydrogenolysis of CO bonds on diphenyl ether over Rh/Al and Rh-Pd/Al was observed to generate cyclohexanol and cyclohexane (
ISSN:	0045-6535 1879-1298
DOI:	10.1016/j.chemosphere.2016.05.026