Abstract:

Based on the analysis of specific surface area, the damage extent of support crystal phase, Pt dispersion, and metal impurity pollution of the CCR catalyst at the end of run, the difference between fresh catalyst and the catalyst in operation was quantitatively compared by using simulation calculation and laboratory activity test. The technical parameters for catalyst replacement were proposed by comparison of the physicochemical properties, catalytic activity and the unit economy between fresh catalyst and the catalyst at different time on stream. When the specific surface area of catalyst in operation is less than 140-145 m2/g, and the activity decreases by 4-5 ℃ and the yield of C5+ decreases by 1.5~2 percentage points, the catalyst in service must be replaced to reduce the operation risk and boost the economic benefit of CCR unit.

Key words: continuous catalytic reforming, catalyst, specific surface area, support crystal phase, metal dispersion, metal impurity