| abstract |
The invention discloses a catalyst, which is composed of a carrier, a double noble metal loaded on the carrier and a catalyst additive, the carrier is coal-based activated carbon; the double noble metal is Pd and Pt, and the double noble metal accounts for 0.9% of the weight of the catalyst -1.1%; the catalyst promoter is Sn and Mn, and the catalyst promoter accounts for 0.1%-0.5% of the catalyst weight, and simultaneously discloses the method of using the catalyst to carry out selective hydrogenation to remove polychloroacetic acid, specifically Mix monochloroacetic acid solution and hydrogen atmosphere to preheat, then contact with catalyst for hydrodechlorination reaction, the reaction temperature is 150-180°C, the pressure at the top of the reaction tower is 0.07-0.15MPa, and the pressure at the bottom is 0.03-0.09MPa. The catalyst provided by the invention has good stability, and the selectivity of monochloroacetic acid is high when it is used for hydrogenation to remove polychloroacetic acid. |