摘要
本文研究了在氢气氛围及HZSM-5、H—Beta、NaY和TiO2催化剂作用下玉米芯与LDPE混合物（重量比2：8）的共热解情况。通过催化热解所得油相液体的烃族分析及碳数分布发现：在催化剂作用下，油相液体的碳数分布变窄，共同热解所得气体产率最高的是H—Beta催化体系，液体产率最高的是NaY，残渣量最多的是TiO2催化体系。催化共热解所得油相液体的碳数分布主要集中在C4～C19之间，使用NaY可获得高品位的油相液体，其研究法辛烷值（RON）为97．5；水相液体中的主要物质是醋酸，加入催化剂后其含量明显增加。四种催化剂中，醋酸生成量最多的是NaY催化剂，其次是HZSM-5，最后是H—Beta和TiO2。其中在NaY催化体系作用下生成的水相液体组分中，醋酸含量为57．8％。
The catalytic co-pyrolysis of the mixture of corncob and polyethylene （2：8 in weight ratio）, using HZSM-5, H-Beta, NaY and TiO2 as the catalysts, was performed in a self-made fixed bed reactor in an atmosphere of hydrogen at 490℃ for 4 hours. The mutual effect between biomass and polyethylene on the yield and distribution of the oily products and aqueous phase liquid products was investigated. The addition of biomass to polyethylene increased the research octane number （RON） value of the oil phase and increased the amount of lighter hydrocarbons. The polyethylene added to biomass was favorable to increase the fields of acetic acid in the aqueous phase. Thus the co-existence of biomass and polymer made the products value-added. Zeolite NaY was not only effective to increase the yield of liquid product and yield the highest concentration of acetic acid but also improve the quality of the oil phase liquid with a RON value of 97.5. The yields of gas and liquid products obtained by HZSM-5 were higher than non-catalytic co-pyrolysis, while the residue produced was equivalent to the non-catalytic pyrolysis. The highest residues were obtained over TiO2. Over H-Beta, the lowest amount of aromatic and the highest content of the olefin in the oil phase resulted in the lowest RON value.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2007年第3期265-269,共5页
Chemical Research and Application
关键词
玉米芯
LDPE
催化热解
生物能源
corncob
low density polyethylene
catalytic co-pyrolysis
bioenergy
