摘要
采用水热合成法制备了中孔分子筛ZrO2/Ti-MCM-41,通过XRD、N2吸附-脱附、FT-IR、UV-Vis对其进行表征,表明其具有中孔结构,并且随着ZrO2含量的增加,ZrO2/Ti-MCM-41孔道的长程有序性和结晶度有所减弱,直至失去中孔结构。将其应用于聚丙烯(PP)的催化裂解反应,通过考察硅钛比、负载量、反应温度、催化剂用量和反应时间,对ZrO2/Ti-MCM-41催化裂解PP反应的规律进行了研究。结果表明,n(Si):n(Ti)=40,ZrO2负载质量分数为18%的ZrO2/Ti-MCM-41,在反应温度400℃,m(ZrO2/Ti-MCM-41):m(PP)=0.02,反应时间30 min的条件下,PP的转化率可达91.2%,液体产物的收率为83.6%,该结果优于热裂解及传统的HZSM-5小孔分子筛催化剂的催化裂解结果。
Mesoporous ZrO2/Ti-MCM-41 materials were synthesized under hydrothermal conditions, and characterized with XRD, VT-IR, UV-Vis and nitrogen adsorption-desorption. The results showed that the obtained materials were mesoporous molecular sieves with long-range order. The crystallinity of ZrOE/Ti-MCM-41 became poor with the increase of ZrO2. ZrO2/Ti-MCM-41 was used as catalyst in the pyrolysis of PP. The influences of reaction conditions, such as n(Si) : n(Ti), content of ZrO2, temperature, dosage of catalyst and reaction time on the pyrolysis results were examined. Under the optimum conditions of n(Si) ; n(Ti)=40, mass percentage of ZrO2 18%, temperature 400℃, re(catalyst) : m(PP)=0.02 and reaction time 0.5 h, the conversion was 91.2% and the yield of liquid products was 83.6%. Compared with the results obtained by thermal pyrolysis and catalytic pyrolysis on HZSM-5, ZrOE/Ti-MCM-41 was of better catalytic activity and higher yield of liquid products, and was especially suitable for the pyrolysis of sterically hindered polymers, such as PP.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2007年第5期684-689,共6页
Chemical Industry and Engineering Progress
基金
国家自然科学基金资助项目(No.20376035)
山东省自然科学基金项目(Y2002B04)