通过混合的TiO₂/SiO₂负载的MAO与rac-Et[Ind]₂ZrCl₂茂金属催化剂进行乙烯和1-己烯共聚时的催化活性。
Catalytic activity during copolymerization of ethylene and 1-hexene via mixed TiO2/SiO2-supported MAO with rac-Et[Ind]2ZrCl2 metallocene catalyst.
作者信息
Jongsomjit Bunjerd, Ngamposri Sutti, Praserthdam Piyasan
机构信息
Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand.
出版信息
Molecules. 2005 Jul 14;10(6):672-8. doi: 10.3390/10060672.
Activities during ethylene/1-hexene copolymerization were found to increase using the mixed titania/silica-supported MAO with rac-Et[Ind]2ZrCl2 metallocene catalyst. Energy Dispersive X-ray spectorcopy (EDX) indicated that the titania was apparently located on the outer surface of silica and acted as a spacer to anchor MAO to the silica surface. IR spectra revealed the Si-O-Ti stretching at 980 cm(-1) with low content of titania. The presence of anchored titania resulted in less steric hindrance and less interaction due to supporting effect.
研究发现，使用混合的二氧化钛/二氧化硅负载的甲基铝氧烷（MAO）与rac-二乙基茚基二氯化锆茂金属催化剂时，乙烯/1-己烯共聚过程中的活性会增加。能量色散X射线光谱（EDX）表明，二氧化钛明显位于二氧化硅的外表面，并作为间隔物将MAO锚定在二氧化硅表面。红外光谱显示，在二氧化钛含量较低时，980 cm⁻¹处有Si-O-Ti伸缩振动。由于负载效应，锚定的二氧化钛的存在导致空间位阻减小和相互作用减弱。
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