磷氮硼(PNB)系催化剂处理对粘胶纤维热裂解行为的影响

Effect of PNB catalysts on the pyrolysis behavior of rayon fibers

催化剂是制备粘胶炭纤维的关键之一,利用含硼、含磷氮和含磷氮硼三种物质作为制备炭纤维的催化剂,通过TG MS手段分析了三种催化剂对粘胶纤维在惰性气氛下热解行为的影响。结果表明:三种催化剂的加入均使粘胶纤维的裂解反应向低温侧移动,并大大提高了粘胶纤维在600℃时的热解收率,三种催化剂均能提高粘胶纤维裂解产物中水和二氧化碳的生成;含硼类催化剂不能抑制焦油、醛酮和呋喃类物质的生成,而含磷氮和含磷氮硼催化剂对焦油、醛酮和呋喃类物质的抑制作用较强。磷氮硼并用时的催化效果优于单独使用磷氮或硼,二者对粘胶纤维的裂解具有协同催化作用。

Catalysts play a key role in the manufacture of rayon-based carbon fibers. The pyrolysis behavior of rayon fibers treated with boron (B), phosphorous-nitrogen (PN) and boron-phosphorous-nitrogen (PNB) containing catalysts were investigated by thermogravimetry-mass spectrometry (TG-MS) analysis in an inert atmosphere. It is found that the addition of B, PN and PNB resulted in a lower pyrolysis temperature and an increase of char, water and carbon dioxide at 600degreesC. PN and PNB restrained the formation of tar, aldehyde derivatives and furan derivatives whereas B did not. The catalysis of B and PN used together is more effective than the single use of B or PN because of their cooperative effect on the pyrolysis of rayon fiber.