01989nas a2200193   4500008004100000022001400041245014600055210006900201260011000270300001200380490000700392520115500399100002201554700001601576700002301592700002901615700002101644856013001665       2012                        eng d  a1463-926200aKinetic analysis of 4-isopropylphenol hydrogenation over activated carbon-supported rhodium catalysts in supercritical carbon dioxide solvent0 aKinetic analysis of 4isopropylphenol hydrogenation over activate  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJan  a633-6380 v143 a<p>Hydrogenation behavior of 4-isopropylphenol to 4-isopropylcyclohexanol over activated carbon-supported rhodium catalysts in supercritical carbon dioxide (scCO(2)) at 313 K was studied in a batch reactor and the results were compared with those in 2-propanol. Higher yields of cis-4-isopropylcyclohexanol were obtained in scCO(2) than in 2-propanol, and the formation of a byproduct, isopropylcyclohexane, was suppressed in scCO(2). The catalyst modification with hydrochloric or phosphoric acid enhanced the yield of cis-4-isopropylcyclohexanol in both scCO(2) and 2-propanol solvents. Kinetic analyses of the reaction profiles revealed higher reaction rates in scCO(2) than those in 2-propanol for the 4-isopropylcyclohexanol formation both by the direct hydrogenation of 4-isopropylphenol and by the consecutive hydrogenation of 4-isopropylcyclohexanone, and also revealed that the addition of hydrochloric acid increased the consecutive hydrogenation rate of 4-isopropylcyclohexanone to cis-4-isopropylcyclohexanol, which reduced the total reaction time needed for the complete hydrogenation of 4-isopropylphenol to 4-isopropylcyclohexanol.</p>1 aHiyoshi, Norihito1 aSato, Osamu1 aYamaguchi, Aritomo1 aRode, Chandrashekhar, V.1 aShirai, Masayuki  uhttps://library.ncl.res.in/content/kinetic-analysis-4-isopropylphenol-hydrogenation-over-activated-carbon-supported-rhodium-0