以TiCl_4/MgCl_2为主催化剂,Al(i-Bu)3为助催化剂,α-烯烃为单体,利用溶液聚合法合成了1-戊烯/1-十二烯二元共聚物减阻剂,首次将1-戊烯作为单体引入减阻剂的制备中。利用室内环道评价聚合物的减阻性能,并考察了反应条件对减阻效果的影响。结果表明,最优聚合条件为戊烯添加量为0.05 m L,十二烯用量为16 m L,主催化剂用量为0.08 g,助催化剂用量为0.1 m L,聚合温度为5℃,此时减阻率可达57.62%。~1HNMR、^(13)CNMR对二元共聚物的表征结果表明烯烃聚合完全;一元和二元共聚物的XRD谱图对比结果表明,在1-十二烯中引入1-戊烯共聚可显著降低聚合物的结晶度。
A series of Fe/HZSM-5 catalysts with different iron loadings were prepared by impregnation method.Characterization was performed by N2 adsorption-desorption,X-ray diffraction(XRD),NH3 temperature-programmed desorption(NH3-TPD),temperature-programmed reduction (TPR),temperature-programmed oxidation(TPO)and thermogravimetry(TG)analysis.Iron content in the synthesized samples varied from 1.1 wt%to 20 wt%.The obtained samples have been used for ethanol conversion into light olefins.It was found that the amount of strong acidity at 300 -5 50-C on Fe-modified samples was decreased,going with another new acid site appearance at 550- 600-C and that Fe/HZSM-5 catalysts were highly selective towards light olefins,especially the 9FZ sample.In addition,Fe-modified catalysts suppressed the conversion of ethanol to aromatics and paraffins and enhanced their anti-carbon deposit ability.
