Determination of chloride in platinum—rhenium alumina-based reforming catalyst by ion chromatography

An Ion chromatographic method was developed for the fast and accurate determination of chloride In Pt-Re/Al₂O₃ catalysts using a Dionex Model 21201 Ion chromatograph. Extraction of chloride was carried out with sodium hydroxide solution In a Teflon Parr bomb at 150 °C. After filtration, Ion chromatographic analyses were made by injecting 100 μl of the diluted solution Into the sample port. Separation of chloride was achieved on a Dlonex AS-4 separator and AG-4 guard column with sodium carbonate-bicarbonate eluent. The proposed method Is free from interferences of sulfide and halides generally encountered in conventional potentiometric and spectrophotometric methods. The total analysis time of less than 1 h was considerably shorter than that reported for conventional methods. The minimum detectable chloride in a catalyst sample was 0.1% by weight with a relative standard deviation of about 3 %.