Showing papers on "o-Cresol published in 1998"
Patent•
25 Nov 1998
TL;DR: In this paper, the authors proposed a serial catalyst with high stability, high activity, long life, high selectivity to o-cresol and 2,6-dimethyl phenol.
Abstract: The catalyst uses V2O5-Fe2O3 as main catalyst, K2O, CuO, PbO or Ce2O3 as cocatalyst, and SiO2 as carrier to form serial catalyst systems including: V1Fe1Cu0.05K0.05/SiO2; V1Fe1K0.02/SiO2; V1Fe1Pb0.05K0.02/SiO2; V1Fe1Cu0.05Pb0.05K0.02/SiO2; V1Fe1Ce0.05K0.02/SiO2; and V1Fe1CuO0.05K0.02/SiO2. The catalyst has high stability, high activity, long life, high selectivity to o-cresol and 2,6-dimethyl phenol, and no p-cresol impurity produced.
5 citations
DOI•
01 Oct 1998TL;DR: In this article, the effects of phenol to methanol mole ratio and Weight Hourly Space Velocity (WHSV) were examined for high phenol conversion and product selectivity.
Abstract: Alkylation of phenol with methanol was carried out over Lewis acid ion exchangedY-zeolites, FeY, ZnY, CdY and LaY at temperatures of 523, 573, 623, 673 and 698 K. The products obtained wereo-cresol, 2,6-xylenol and anisole. The effects of phenol to methanol mole ratio and Weight Hourly Space Velocity (WHSV) were examined for high phenol conversion and product selectivity. Phenol conversion decreased with increase of temperature over all the catalysts due to coke deposition. Selectivity too-cresol decreased with increase of temperature as it, once formed, became the reactant for formation of 2,6-xylenol. Selectivity to 2,6-xylenol increased with increase of temperature indicating high activation energy for its formation. Selectivity to anisole, although formed less than 10% over all the catalysts, decreased with increase of temperature due to its conversion too-cresol and then to 2,6-xylenol. In addition, selectivity to anisole also decreased with decrease of phenol to methanol feed ratio and WHSV. The study of time on stream showed preferential blocking of strong acid sites by coke deposits and hence these site dependent formations ofo-cresol and 2,6-xylenol were greatly reduced but free weak acid site dependent anisole formation increased with time.
1 citations
Journal Article•
TL;DR: Alkylation of phenol and cresols with ethanol in the presence of an iron-aluminum catalyst was studied in this paper, and the results showed that phenol was more stable than cresol.
Abstract: Alkylation of phenol and cresols with ethanol in the presence of iron-aluminum catalyst was studied.
1 citations