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• W2056084920 abstract "Factors which influence the loss and retention of chlorine on an industrial bimetallic reforming catalyst have been studied. Temperature showed a marked effect on chlorine loss during calcination and reduction, the loss being greater during reduction than during calcination. Activation energies for chlorine loss were 6 Kcal mol−1 for calcination and 2.6 Kcal mol−1 for reduction in the temperature range 470–550° C. Increase in feed moisture content during reforming enhanced the loss of chlorine significantly. The following correlation between chlorine loss and feed moisture content was obtained: Chlorine loss (wt %) = 2.8 (moisture in feed, ppm)0.45 Depletion of chlorine from the catalyst resulted in considerable decrease in the aromatization activity. Addition of chlorine to the moisture containing feed in different proportions showed that an optimum level of chlorine should be maintained in the feed for a given moisture level (e.g., 20 ppm Cl for 100 ppm H2O) in order to achieve a balanced product pattern. Higher chlorine levels resulted in considerable yield loss, indicating enhancement of hydrocracking reactions. The catalyst's chlorine content has been correlated with feed moisture and chlorine levels by: Chlorine in catalyst (wt %) = 0.438 (Cl in feed, ppm)0.17 (moisture in feed,ppm)0.1 Carbon deposition on the catalyst was found to be minimal with 0.9 to 1.1% chlorine in the catalyst. Addition of chlorine to the moisture containing feed was found to balance the effect of moisture on support sintering and stabilize the support surface area. The effect of chlorine addition on reactivating a reforming catalyst deactivated by moisture was also studied, using continuous and pulse modes of chlorination. The lost activity of the catalyst was fully recovered by both modes of chlorine injection. However, for pulse chlorination, the reformate yield suddenly dropped immediately after chlorine injection. As the reforming continued, reformate yield and aromatics produced on feed basis increased progressively, indicating suppression of hydrocracking activity and increase of aromatization (or dehydrocyclization) activity. Higher chlorine dosage however, resulted in considerable yield loss in both modes. Addition of chlorine in successive pulses resulted in recovering and maintaining catalyst activity close to the original level." @default.
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• W2056084920 date "1983-09-01" @default.
• W2056084920 modified "2023-09-24" @default.
• W2056084920 title "Chlorine leaching and replenishing studies on a bimetallic reforming catalyst" @default.
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• W2056084920 doi "https://doi.org/10.1016/0166-9834(83)80033-5" @default.
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