NTP再生La改性多级孔HZSM-5及催化提质生物油的试验研究

以氧气为气源,利用低温等离子体（NTP）喷射系统,在不同温度下对结焦失活的La改性多级孔HZSM-5分子筛进行再生,采用TG、XRD、Py-IR及N₂吸附-脱附等测试技术对再生前后催化剂的理化性质进行表征,并利用再生催化剂进行在线催化提质生物油试验。结果表明,再生温度为250℃时,失活La改性多级孔HZSM-5分子筛再生效果最好,去除了97.4%的积炭,其表面结晶度、酸性、比表面积和孔容恢复程度最高。再生温度上升至300℃时,O₃分解较多,此时O₃分解已经成为积炭氧化分解的限制因素,排气中CO₂和CO浓度峰值减小,失活催化剂再生效果有所下降。再生温度为250℃时,再生催化剂催化性能恢复最好,制得的生物油高位热值最大（36.48 MJ/kg）,烃类含量最高（40.51%）,其理化性质与新鲜催化剂制得的生物油理化性质最接近。

Study on regeneration of La modified multistage pore HZSM-5 by NTP and catalytic upgrading of bio-oil

Regeneration experiments of La modified multistage pore HZSM-5 zeolite were carried out at different regeneration temperatures by non-thermal plasma (NTP) spray system with oxygen as gas source. The physicochemical properties of La modified multistage pore HZSM-5 zeolite before and after regeneration were characterized by TG, XRD, Py-IR and N₂ adsorption-desorption. The experiments of on-line catalytic upgrading of bio-oil were carried out over regenerated catalyst. The results showed that when regeneration temperature was 250℃, the deactivated La modified multistage pore HZSM-5 zeolite had the best regeneration effect, 97.4% of coke was removed, and the surface crystallinity, acidity, specific surface area and pore volume recovery were the best. When regeneration temperature rose to 300℃, the decomposition amount of O₃ was more. At this time, the decomposition of O₃ had become the limiting factor for oxidative decomposition of coke. The peaks of CO₂ and CO concentration decreased, and the regeneration effect of deactivated catalyst declined. When regeneration temperature was 250℃, the catalytic performance recovery of regenerated catalyst was the best. The bio-oil produced by regenerated catalyst had the highest heating value (36.48 MJ/kg) and the highest hydrocarbon content (40.51%), and its physical and chemical properties were closest to that of bio-oil produced by fresh catalyst.