A symposium report on the gas-phase methylation of catechol by methanol on g -Al2O3 modified by the basic elements: K, Li, Mg and Ca. Addn. of 7.5 at % Mg to g-Al2O3 was optimal and increased the 3-Me catechol selectivity from 0.26 to 0.65. X-ray diffraction expts. showed the diffusion of Li+ and Mg2+ cations into the g -Al2O3 bulk. This induces a change in the surface species and the surface acid-base properties. Ca2+ and K+ addn. to g-alumina was ineffective due to formation of basic oxide layers on the surface. [on SciFinder (R)]
Titre
Selective methylation of catechol: Catalyst development and characterization
Publié dans
11th International Congress on Catalysis - 40th Anniversary
Série
Studies in Surface Science and Catalysis, 101
Pages
171-180
Date
1996
Editeur
Amsterdam, Elsevier
Note
CAN 125:328195 25-10 Benzene, Its Derivatives, and Condensed Benzenoid Compounds Institute Chemical Engineering,Swiss Federal Institute Technology (EPFL),Lausanne,Switz. Journal 0167-2991 written in English. 1344-28-1D (Alumina); 7439-93-2 (Lithium); 7439-95-4 (Magnesium); 7440-09-7 (Potassium); 7440-70-2 (Calcium) Role: CAT (Catalyst use), USES (Uses) (selective methylation of catechol by methanol in presence of metal-modified alumina); 120-80-9 (Catechol); 488-17-5 (3-Methylcatechol) Role: RCT (Reactant), RACT (Reactant or reagent) (selective methylation of catechol by methanol in presence of metal-modified alumina)
Date de création de la notice
2006-04-18
