TY - JOUR
T1 - Co(salen)/SBA-15 catalysed oxidation of a beta-O-4 phenolic dimer under microwave irradiation
AU - Badamali, Sushanta K.
AU - Luque, Rafael
AU - Clark, James H.
AU - Breeden, Simon W.
PY - 2011/6/10
Y1 - 2011/6/10
N2 - The microwave-assisted oxidative degradation of a lignin model phenolic dimer [1-(4-hydroxy-3-methoxyphenoxy)-2-(2-methoxyphenoxy)-propane-1,3-diol, 1] catalysed by Co(salen)/SBA-15 is reported. The investigated model compound 1 was prepared through a multistep synthesis and characterized by H-1,C-13 NMR, and GC-MS studies. The catalyst was prepared by immobilizing [N.N'-bis(salicylidene)ethane-1,2-diaminato]Cobalt(11), Co(salen) complex onto the periodic mesopore channels of siliceous SBA-15. The activity of the Co(salen)/SBA-15 was investigated in the oxidation of 1 in the presence of hydrogen peroxide as oxidant, both under microwave irradiation and conventional heating. The phenolic dimer was selectively oxidized to 2-methoxy phenol with very high TON under microwave activation conditions. Comparatively, reactions run under conventional heating led to oligomerisation of the dimer and resulted in a mixture of products. (C) 2011 Elsevier B.V. All rights reserved.
AB - The microwave-assisted oxidative degradation of a lignin model phenolic dimer [1-(4-hydroxy-3-methoxyphenoxy)-2-(2-methoxyphenoxy)-propane-1,3-diol, 1] catalysed by Co(salen)/SBA-15 is reported. The investigated model compound 1 was prepared through a multistep synthesis and characterized by H-1,C-13 NMR, and GC-MS studies. The catalyst was prepared by immobilizing [N.N'-bis(salicylidene)ethane-1,2-diaminato]Cobalt(11), Co(salen) complex onto the periodic mesopore channels of siliceous SBA-15. The activity of the Co(salen)/SBA-15 was investigated in the oxidation of 1 in the presence of hydrogen peroxide as oxidant, both under microwave irradiation and conventional heating. The phenolic dimer was selectively oxidized to 2-methoxy phenol with very high TON under microwave activation conditions. Comparatively, reactions run under conventional heating led to oligomerisation of the dimer and resulted in a mixture of products. (C) 2011 Elsevier B.V. All rights reserved.
KW - Lignin oxidation
KW - beta-O-4 phenolic dimer
KW - Microwave
KW - Co(salen)/SBA
KW - LIGNIN MODEL COMPOUNDS
KW - DEGRADATION
KW - CHEMISTRY
UR - http://www.scopus.com/inward/record.url?scp=79953240251&partnerID=8YFLogxK
U2 - 10.1016/j.catcom.2011.02.025
DO - 10.1016/j.catcom.2011.02.025
M3 - Article
SN - 1566-7367
VL - 12
SP - 993
EP - 995
JO - Catalysis Communications
JF - Catalysis Communications
IS - 11
ER -