摘要
将Hβ沸石进行水蒸气处理、酸处理改性后,其比表面、总孔容及平均直径均增大,二次孔孔体积占总体积的38.7%,说明改性后的沸石具有更通畅的孔道和较多的二次孔,总酸量减少,酸强度分布降低。热重分析研究了处理前后的Hβ沸石作催化剂对聚苯乙烯及聚乙烯催化降解的作用。结果表明,Hβ沸石能显著地降低聚乙烯的热降解温度,催化剂的酸量对聚乙烯降解温度及积炭生成有很大的影响。催化剂酸量增加,聚乙烯的降解温度显著下降,同时积炭的含量却明显增加,是热降解产生积碳的6倍;而催化剂对聚苯乙烯的热降解温度影响不大,且主要取决于孔道结构。但积碳的生成与聚乙烯类似,都是随着催化剂的酸量增加而大幅度增加。
Pore structure of Hβ-zeolite was changed by hydrothermal and acid treatment. The surface areas, total volumes and average diameters were broadened. The pore volume produced by treatment was 38.7% of total pore volume. By modifying the pore size was broadened and produced more pore, but the acid amount and acid strength decreased. Thermogravimetric analyses were used to investigate the activity of Hβ-zeolite catalysts in the degradation of polystyrene and polyethylene. The results show that modified Hβ-zeolite could reduce degradation temperature of polyethylene. The acidity of eatalys exhibits much influecnce on degradation temperature and coking. The increase of catalyst acidity leads to a significantly decrease in degradation temperature, but a remarkable increase in coke yield, which is 6 times of thermal degradation. The effect of catalyst on degradation temperature for polystyrene is slight, and mainly depends on pore structure of catalyst. Coking is simlar to that of polyethylene, that is, coking increases with the increasing catalyst acidity.
出处
《辽宁石油化工大学学报》
CAS
2005年第3期5-7,共3页
Journal of Liaoning Petrochemical University
关键词
HΒ沸石
催化剂
聚苯乙烯
聚乙烯
催化降解
Hβ Zeolite
Catalyst
Polystyrene
Polyethylene
Catalyzed degradation
