PDF全文下载：2017040026
刘欣， 刘福胜*
(青岛科技大学 化工学院，山东 青岛 266042)
摘要： 采用直接水热合成法分别制备了BaO(CaO,MgO)/SBA-15介孔分子筛并催化高抗冲聚苯乙烯(HIPS)裂解反应，通过转化率、液体收率以及苯乙烯单体选择性判断催化剂催化活性。结果表明，BaO/SBA-15催化效果最佳。因此本实验主要制备BaO/SBA-15介孔分子筛，通过小角XRD以及氮气吸附脱附对其结构进行了表征。结果表明：Ba的引入并没有明显改变SBA-15的结构特性，其中BaO/SBA-15(60)的比表面积和孔容最大，分别是809.0 m2·g-1和1.07 cm3·g-1。另外，考查了硅钡物质的量的比、反应温度、催化剂用量、反应时间以及反应压力对HIPS催化裂解反应结果的影响，得到的较佳反应条件如下：硅钡物质的量的比60∶1、反应温度430 ℃、反应时间为30 min、催化剂用量为4%(催化剂与原料质量比)、真空度0.02 MPa，在上述条件下，转化率和液体收率分别可达97.7%(质量分数)和93.1%(质量分数)。此外，考察了催化剂的重复回用性能，结果表明重复回用6次后，HIPS的转化率和液体产物收率没有显著减少。
关键词： 介孔分子筛； BaO/SBA-15； 高抗冲聚苯乙烯(HIPS)； 催化裂解
中图分类号： O 69文献标志码： A
引用格式：刘欣， 刘福胜.BaO/SBA-15介孔分子筛催化裂解高抗冲聚苯乙烯反应研究\[J\]. 青岛科技大学学报（自然科学版）， 2017， 38（4）： 26-31.
LIU Xin， LIU Fusheng. Cracking of high impact polystyrene catalyzed by mesoporous molecular sieves BaO/SBA-15\[J\]. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2017, 38(4)： 26-31.
Cracking of High Impact Polystyrene Catalyzed by Mesoporous Molecular Sieves BaO/SBA-15
LIU Xin， LIU Fusheng
(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: Mesoporous molecular sieves BaO(CaO,MgO)/SBA-15 were synthesized by direct synthesis method. The obtained materials were used for the degradation of high impact polystyrene (HIPS), the catalytic properties were investigated in the conversion, the yield of liquid and the selectivity of styrene monomer. And the BaO/SBA-15 was found to have highest catalytic performance. Therefore, BaO/SBA-15 materials were prepared and were characterized by XRD and N2 adsorption/desorption. The results indicated that incorporation of Ba in SBA-15 framework without significantly changing the textural properties of SBA-15. and BaO/SBA-15(60) exhibited the largest surface areas (809.0 m2·g-1) and pore volume (1.07 cm3·g-1) among the BaO/SBA-15 samples. Furthermore, the effects of molar ratio of Si to Ba, reaction temperature, reaction time, catalyst dosage and reaction pressure on HIPS cracking results were investigated. The obtained optimum conditions were n(Si)∶n(Ba) =60∶1, temperature 430 ℃, reaction time 30 min, catalyst dosage 4% and vacuum degree 0.02 MPa. Under above conditions, the conversion was 97.7% and the yield of liquid was 93.1%. Moreover, the reusability of catalyst was examined, the results showed that there was no significant decrease in conversion and yield of liquid product after reused 6 times.
Key words: mesoporous molecular sieves; BaO/SBA-15; high impact polystyrene(HIPS); catalytic cracking
收稿日期： 2015-12-28
作者简介： 刘欣(1990—),男，硕士研究生.*通信联系人.
文章编号： 1672-6987（2017）04-0026-06； DOI： 10.16351/j.1672-6987.2017.04.004
