Benutzer: Gast  Login
Dokumenttyp:
Journal Article 
Autor(en):
He, J. Y.; Zhao, C.; Lercher, J. A. 
Titel:
Ni-Catalyzed Cleavage of Aryl Ethers in the Aqueous Phase 
Abstract:
A novel Ni/SiO2-catalyzed route for selective Cleavage of ether bonds of (lignin-derived) aromatic ethers and hydrogenation of the oxygen-containing intermediates at 120 degrees C in presence of 6 bar H-2 in the aqueous phase is reported. The C-O bonds of alpha-O-4 and beta-O-4 linkages are cleaved by hydrogenolysis on Ni, while the C-O bond of the 4-O-5 linkage is cleaved via parallel hydrogenolysis and hydrolysis. The difference is attributed to the fact that the C fragments generated from hydrolysis of alpha-O-4 and beta-O-4 linkages can undergo further hydrogenolysis, while phenol (produced by hydrolysis of the 4-O-S linkage) is hydrogenated to produce cyclohexanol under conditions investigated. The apparent activation energies, Ea(alpha-O-4)
Kongresstitel:
ISI Document Delivery No.: 065NC Times Cited: 7 Cited Reference Count: 33 He, Jiayue Zhao, Chen Lercher, Johannes A. graduate school (Faculty Graduate Center of Chemistry) of Technische Universitat Munchen; Elitenetzwerk Bayern (graduate school NanoCat); European Graduate School for Sustainable Energy J.H. gratefully acknowledges support from the graduate school (Faculty Graduate Center of Chemistry) of Technische Universitat Munchen and Elitenetzwerk Bayern (graduate school NanoCat). C.Z. is...    »
 
Zeitschriftentitel:
Journal of the American Chemical Society 
Jahr:
2012 
Band / Volume:
134 
Heft / Issue:
51 
Seitenangaben Beitrag:
20768-20775