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Continuous Chemoselective Methylation of m ‐Cresol and Phenol with Supercritical Methanol over Solid Acid and Base Metal Oxide Catalysts
Author(s) -
Oku Tomoharu,
Arita Yoshitaka,
Ikariya Takao
Publication year - 2005
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200505191
Subject(s) - chemistry , catalysis , supercritical fluid , methanol , phenol , selectivity , oxide , metal , base (topology) , inorganic chemistry , organic chemistry , mathematical analysis , mathematics
The chemoselective methylation of m ‐ cresol and phenol with supercritical methanol (scCH 3 OH) promoted by metal oxide catalysts (MgO, ZrO 2 , CsPSi and FeV/SiO 2 ) was investigated in a continuous flow fixed bed reactor. The use of scCH 3 OH as a carrier medium led to a significant change in the product selectivity compared to that attained in the gas phase reaction, and caused a marked suppression of the degradation of CH 3 OH during the reaction, resulting in an improvement in the catalyst lifetime. The chemoselective outcome of the reaction was highly influenced by the acid‐base character on the solid catalysts examined under supercritical conditions.