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Citation: LI Fu-Xiang, MENG Xin, LÜ Zhi-Ping, XUE Jian-Wei. Effect of Preparation Temperature on Deactivation of Pd/C Catalysts in Hydrodechlorination[J]. Chinese Journal of Applied Chemistry, ;2005, 22(1): 30-34. shu

Effect of Preparation Temperature on Deactivation of Pd/C Catalysts in Hydrodechlorination

1.
Institute of Special Chemistry, Taiyuan University of Technology, Taiyuan 030024

Corresponding author: LI Fu-Xiang,
Received Date: 30 December 2003
Available Online: 16 September 2004
Fund Project: 山西省自然科学基金资助项目(20021010) (20021010)山西省科技攻关项目(021112) (021112)

The life of each of Pd/C catalysts prepared at different temperatures was tested on a continuous gas-solid fixed bed reactor at 145℃. The results show that the deactivation rates of catalysts were speeded up with increasing the preparation temperature. When the as-prepared and used catalysts were characterized by XRD and DTA, it was found that carbonaceous deposit was the main factor of the deactivation of catalysts. As the preparation temperature increased, the rates of the carbonaceous deposits were speeded up due to the formation of big active particles of metal. During the preparations of catalysts and the hydrodechlorination reaction, the supports of catalysts were apparently hydrogenated. With the preparation temperature increasing, the burning temperature of the supports of Pd/C catalysts lowered from 610~625℃ of pure supports to about 589℃. When the preparation temperature was over 450℃, a new burning peak of the supports appeared at about 530℃. The degree of hydrogenations of supports was greater with the reaction time increasing. The burning peaks of all the supports appeared at 490~500℃ after deactivation of catalysts. And the hydrogenation degrees were related to the deactivation of catalysts.
- deactivation,
- carbonaceous deposit,
- Pd/C,
- hydrodechlorination
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