Effects of Reaction Conditions on Saturated Hydrogenation of Naphthalene

The effect of hydrogenation reaction temperature,pressure and space velocity on the conversion of naphthalene,the selectivity of tetralin and decalin as well as the mass ratio of trans-/cis-decalin was investigated over nickel-alumina catalysts in a fixed bed reactor.Furthermore,the selective formation of the two isomers of decalin(trans-and cis-decalin) was also studied.The results showed that the conversion of naphthalene could achieve 100% and the selectivity of decalin was higher than 95% at 0.6～6.0 h-1of the space velocity,210～250 ℃ of reaction temperature and higher than 5.7 MPa of hydrogen pressure.Further investigation of the selective formation of trans-decalin and cis-decalin was carried out based on the tendency of trans-decalin/cis-decalin mass ratio varying with the different reaction temperature,pressure and space velocity.The results revealed that the highly selective formation of the trans-decalin as well as cis-decalin could be achieved and the trans-decalin/cis-decalin mass ratio could attain a higher value of 8.70 and a lower value of 0.86.