Abstract: The effects of  hydrogen from PSA, ethylene units and reforming unit on the performance of HLD-001 and HAT-099 catalyst for toluene disproportionate and transalkylation were analyzed. The results indicated that the reaction temperatures for catalyst HLD-001 increased from 362 ℃ to 378 ℃ after using hydrogen from reforming unit, replacing hydrogen from ethylene unit ,the total conversion ratio reduced by 0.23 percentage point, and the conversion ratio of C10 aromatics reduced by 6.83 percentage points; after using hydrogen from reforming unit, the reaction temperature for catalyst HAT-099 increased from 356 ℃ to 378 ℃, the total conversion ratio reduced by 1.58 percentage points and the conversion ratio of C10 aromatics reduced by 4.3 percentage points. It is concluded that the CO in the hydrogen from reforming unit has a great influence on the catalyst activity.

Key words: toluene disproportionation, transalkylation, catalyst, CO, reaction activity, Hydrogen, Xylene