Abstract
Liquid phase alkylation of benzene to linear alkyl benzene (LAB) with α-olefins has been investigated with 12-silicotungstic acid supported on zirconia (STA/ZrO 2) as the catalyst. Among the catalysts, 15 wt.% STA/ZrO 2 calcined at 750 °C was found to be most active than others in the alkylation reaction. The total amount of acid sites of different STA loaded catalysts were estimated by TPD of NH 3 and 15 wt.% STA/ZrO 2 calcined at 750 °C was found to have the highest acidity and more active in the reaction. The optimization of reaction conditions of alkylation of benzene with 1-dodecene was performed with 15 wt.% STA/ZrO 2 calcined at 750 °C by varying catalyst concentration (1–5 wt.% of reaction mixture); temperature, 373–423 K and benzene:1-dodecene (1-dd) molar ratio, 5–15 in a Parr autoclave under N 2 pressure. Under the optimized reaction conditions, conversion of 1-dodecene (50.8%) gave high selectivity to 2-phenyl dodecane (47.1%) and the remaining 3-, 4-, 5- and 6-phenyldodecanes in 4 h. The reaction was found to be heterogeneously catalyzed and no contribution from homogeneous (leached) STA into the reaction medium.
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