Reaction control in radical-transforming catalytic degradation of polypropylene

For the purpose of chemical recycling of plastic wastes, catalytic degradat ion and liquefaction of Polypropylene (PP), subjected to high pressure H-2 was examined with a batch reactor. Iron supported active carbon (Fe/A.C.) a cted to decrease solids and also increase liquid yield in condition of 673- 693 K at H-2 pressure of 4.0 MPa (NTP) for 1 h. Compared with thermal degra dation, liquid products became lighter because residue produced was degrada ted by the catalyst. Compared H-2 with Ar as reaction gas at 683 K, degrada tion of PP was promoted by H-2 in 0.5-1.0 h. In the results of the effect o f Hz pressure, degradation of PP was proceeded as the increase of H-2 under 3.0 MPa but was suppressed over 4.0 MPa. These results show that H-2 plays an important role in catalytic degradation of PP over Fe/A.C, catalyst.