کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
56772 | 47095 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Performance of carbon nanofibres, high surface area graphites, and activated carbons as supports of Pd-based hydrodechlorination catalysts Performance of carbon nanofibres, high surface area graphites, and activated carbons as supports of Pd-based hydrodechlorination catalysts](/preview/png/56772.png)
Palladium catalysts (1 wt%) supported on three different carbonaceous supports (activated carbon, AC; carbon nanofibre, CNF; and high surface area graphite, HSAG) were prepared and tested for tetrachloroethylene (TTCE) catalytic hydrodechlorination at 523 K and 195 h−1 space velocity (WHSV). Organic solutions (0.9 mol/L of TTCE in toluene) were used as feed, simulating real chlorinated wastes. Pd/activated carbon and Pd/CNF have shown a fast deactivation on stream, whereas the HSAG-supported catalyst showed the best performance. Characterization of fresh and used catalysts by BET, TEM, XRD and XPS revealed that the deactivation of Pd/AC catalyst is caused by the micropore blockage because of coke formation, whereas in the case of Pd/CNF, deactivation is caused by a combination of coke deposition (in lower extent than in the case of activated carbon), active phase sintering and chlorine poisoning. The best behaviour of the HSAG-based catalysts is caused by the absence of sintering and coke formation, although chlorine poisoning is still present.
Journal: Catalysis Today - Volume 150, Issues 1–2, 26 February 2010, Pages 16–21