摘要
在吡啶类单亚胺碳原子上引入不同位阻的烷基合成了新型吡啶二亚胺Fe络合物:2-丙基-6-乙基吡啶二亚胺Fe(Cat-1)和2,6-二丙基吡啶二亚胺Fe。利用NMR,XRD,GC等方法分析了络合物结构,并通过乙烯齐聚考察了它们的催化活性。实验结果表明,两种络合物均显现出较高的乙烯齐聚催化活性,其中Cat-1活性最高,且显著高于已报道的经典催化剂。在以改性甲基铝氧烷为助催化剂时,Cat-1用量较少时,催化乙烯齐聚活性即可达92.2×10^(7)g/(mol·h)。乙烯压力升高有利于提升Cat-1的催化活性,而压力下降有利于降低产物中蜡状物含量,随着乙烯压力的增加,产物的n(C_(14))∶n(C_(15))逐渐增大,高碳数烯烃占比逐渐增大。
Novel pyridine diimine iron complexes were synthesized by introducing alkyl groups with varying steric hindrance on the carbon atoms of pyridine monoimines,specifically 2-propyl-6-ethylpyridine diimine iron(Cat-1)and 2,6-dipropylpyridine diimine iron.The structures of these complexes were characterized by NMR,XRD,and GC.Their catalytic activities were evaluated through ethylene oligomerization reactions.The experimental results indicate that both complexes exhibit high catalytic activity for ethylene oligomerization,with Cat-1 demonstrating the highest activity,significantly surpassing that of previously reported classical catalysts.When modified methylalumoxane is employed as a co-catalyst and the amount of Cat-1 is relatively low,the catalytic ethylene oligomerization activity can reach up to 92.2×10^(7) g/(mol·h).An increase in ethylene pressure enhances the catalytic activity of Cat-1,whereas a decrease in pressure facilitates the reduction of waxy components in the product.As ethylene pressure increases,the n(C_(14))∶n(C_(15))of the product gradually rises,and the proportion of high-carbon-number olefins progressively increases.
作者
徐珂
XU Ke(Sinopec(Beijing)Research Institute of Chemical Industry Co.,Ltd.Yanshan Branch,National Engineering Research Center for Synthesis of Novel Rubber and Plastic Materials,Beijing 102500,China)
出处
《石油化工》
北大核心
2025年第7期954-959,共6页
Petrochemical Technology
关键词
吡啶二亚胺
吡啶二亚胺铁络合物
铁系催化剂
乙烯齐聚
pyridine diimine
pyridine diimine iron complex
iron-based catalyst
ethylene oligomerization
