About: 2,6-Xylenol is a(n) research topic. Over the lifetime, 72 publication(s) have been published within this topic receiving 673 citation(s).
Papers published on a yearly basis
TL;DR: In this article, the alkylation of phenol with methanol is conducted over Ni 1− x Co x Fe 2 O 4 (x = 0, 0.2, 0., 0.5, 1.8, and 1.0) type systems prepared via low temperature route.
Abstract: The alkylation of phenol with methanol is conducted over Ni 1− x Co x Fe 2 O 4 ( x =0, 0.2, 0.5, 0.8 and 1.0) type systems prepared via low temperature route. Alkylation leads to predominantly ortho methylation of phenol, yielding o -cresol and 2,6-xylenol as the products. Under optimized conditions, the total ortho selectivity was ≥94%, regardless of the catalyst composition. Only traces of anisole is formed and hardly any other xylenol or cresol isomers are detected. Phenol conversion and the individual selectivities for o -cresol and 2,6-xylenol depend strongly on the catalyst composition. Selectivity for o -cresol was maximum for NiFe 2 O 4 (i.e., when x =0), whereas upon progressive substitution of Co 2+ ions for Ni 2+ ions, the 2,6-xylenol selectivity increases with a concomitant decrease in the o -cresol selectivity. Maximum phenol conversion and 2,6-xylenol selectivity (also total ortho selectivity) were observed over CoFe 2 O 4 ( x =1). The activity and selectivity were shown to be strongly dependent on the surface acid–base properties of the system. The influences of surface acidity, cation distribution in the spinel lattice and various reaction parameters are discussed.
01 Aug 1963-Analytical Chemistry
15 Feb 1989-Applied Catalysis
TL;DR: In this paper, the synthesis of 2,6-xylenol by alkylation of phenol was investigated using iron catalysts modified with chromium, silicon, potassium or caesium ions.
Abstract: Iron catalysts modified with chromium, silicon, potassium or caesium ions were investigated in the synthesis of 2,6-xylenol by alkylation of phenol wit
03 Apr 1989-Applied Catalysis
TL;DR: In this paper, the acidity of the catalysts was measured by n-butylamine titration and by cyclohexanol dehydration at 523 K, which was also used as an acidity index.
Abstract: Vapour-phase alkylation of phenol with methanol was carried out over a series of simple and mixed oxides of vanadia and chromia of different atomic ratios in a fixed-bed, continuous-flow reactor at 573–723 K and 1–20 bar pressure. Preferential orthoalkylation with 90% selectivity took place with the formation of o-cresol and 2,6-xylenol. The acidity of the catalysts was measured by n-butylamine titration and by cyclohexanol dehydration at 523 K, which was also used as an acidity index. Variation of the activity with the atomic ratios of V and Cr in the mixture was correlated with acidity, total phenol conversion and selectivity for o-cresol and 2,6-xylenol. An increase in acidity increases the selectivity for 2,6-xylenol. Pure vanadia is a better alkylation catalyst than pure chromia. However, addition of a small amount of chromia to vanadia improves the acidity and also the total activity and selectivity for 2,6-xylenol.
01 Apr 1966-Journal of Organic Chemistry