粒径、升温速率及催化剂对废轮胎胶粉热解特性的影响

Influence of Tire Powder's Pyrolysis by Particle Size /Heating Rate and Catalyst and Its Thermogravimetric Analysis

采用热重分析法探讨了不同粒径、升温速率及催化剂对废轮胎胶粉热解特性的影响。结果表明:随升温速率加快,废轮胎胶粉的TG/DTG曲线向着高温区段移动,且热解反应时间Δt会缩短,说明升温速率加快有助于废轮胎胶粉的热解反应;粒径(20目至100目)对废轮胎胶粉热解反应TG/DTG曲线影响很小,但目数增大最终失重率会变小。在低温段,NiCl2,CoCl2和Co/Ni 3种催化剂都能有效降低废轮胎胶粉热解的反应活化能,其中NiCl2效果明显,可以降低30.37 kJ/mol,而ZnO对低温区的反应活化能没有影响;在高温段,NiCl2能降低废轮胎胶粉的反应活化能,而CoCl2,Co/Ni和ZnO则使反应活化能分别升高16.966 kJ/mol,10.813 kJ/mol和7.5 kJ/mol;催化剂Cr2O3对低温段和高温段的反应活化能没有影响。

A TG experiment was conducted to study the pyrolysis process of waste tire powder. The TG/DTG curve and its change rule were discussed on the condition of the different particle size, heating rate and catalyst. The results show that The TG/DTG curve moved to high- temperature zone with incre- ment of temperature rising rate, and the pyrolysis reaction time At would cut short, which proved that speed up the heating rate contribute to pyrolysis reaction of waste tire powder. The influence of particle size （20 mesh to 100 mesh） to the TG/DTG curve of waste tire powder was thin and the final weight loss rate decreased with the increase of mesh number. NiCl2 CoCl2 and Co/Ni could reduce the activa- tion energy of waste tire powder in the iow temperature zone, among which the effect of NiCl2 was obvi- ous which decreased activation energy for 30.37 kJ/mol, ZnO had no influence on reaction activation energy in low temperature zone; In the high temperature zone NiCI2 decreased reaction activation energy of waste tire, however, CoCl2, Co/Ni and ZnO increased reaction activation energy to the 16. 966 kJ/mol 10. 813 kJ/mol and 7.5 kJ/mol each; Cr2O3 had no influence on the activation energy of the waste tire powder in the low and high temperature zone.