Combined light naphtha isomerization and naphthenic ring opening reaction on modified platinum on chlorinated alumina catalyst

Abstract

The effect of alumina phases on the catalytic performance of platinum (Pt) on chlorinated alumina catalysts studied in the combined light naphtha isomerization and naphthenic ring opening reaction. The results showed that the type of alumina had a great impact on the catalytic performance of the Pt on chlorinated alumina catalysts. The support prepared by a mixture of eta and gamma alumina with the ratio of 70:30 shows better surface area, acidity and catalytic performance. Extra pre-chlorination of catalysts had a positive effect on the catalytic performance in the butane isomerization reaction. Activities of prepared catalysts tested in a pilot plant with two consecutive fixed bed reactors under different operating conditions. Under the experimental conditions of this study, temperatures greater than 135 °C had a reverse effect on the octane number of the products. It was found that the high LHSV has a negative effect on the strong acidic sites and with returning the LHSV to the initial value, 22DMB/ΣC6 ratio and ring opening reaction rate could not be restored completely.