本文選題：.代聚酰胺-胺 + 樹枝狀PNP配體　； 參考：《高等學(xué)�；瘜W(xué)學(xué)報》2017年07期

【摘要】：以1.0代聚酰胺-胺(PAMAM)為配體骨架,氯代二苯基膦為原料,通過取代反應(yīng)合成了1種含有較大空間位阻的新型樹枝狀PNP配體,再以Cr Cl3(THF)3為絡(luò)合試劑,通過絡(luò)合反應(yīng)合成樹枝狀PNP鉻催化劑.采用傅里葉變換紅外光譜(FTIR)、紫外-可見分光光度計(UV-Vis)、核磁共振波譜(NMR)、電噴霧電離質(zhì)譜(ESI-MS)和元素分析等手段證實合成的新型樹枝狀PNP配體及其鉻催化劑的結(jié)構(gòu)與理論設(shè)計的結(jié)構(gòu)一致.以甲基鋁氧烷(MAO)為助催化劑,對乙烯齊聚反應(yīng)進行了研究,考察了溶劑種類、反應(yīng)溫度、反應(yīng)壓力及Al/Cr摩爾比對該催化劑活性和選擇性的影響.結(jié)果表明,以甲苯為溶劑,MAO為助催化劑,當反應(yīng)溫度為25℃,反應(yīng)壓力為0.9 MPa,Al/Cr摩爾比為500時,該催化劑的活性高達2.15×105g/(mol Cr·h),催化劑對乙烯三聚、四聚反應(yīng)的選擇性共達到36.76%.
[Abstract]:A new dendritic PNP ligand containing large steric resistance was synthesized by substitution reaction using 1.0 generation polyamide-amine (PAMAM) as ligand skeleton and chlorodiphenylphosphine as raw material. Cr Cl3(THF)3 was then used as complexing reagent. Dendritic PNP chromium catalyst was synthesized by complexation reaction. The structure and mechanism of the new dendritic PNP ligands and their chromium catalysts were confirmed by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectrophotometer (UV-Visn), nuclear magnetic resonance spectroscopy (NMR), electrospray ionization mass spectrometry (ESI-MS) and elemental analysis. The structure of the design is consistent. The oligomerization of ethylene was studied with methyl aluminoalkane Mao as the co-catalyst. The effects of solvent type, reaction temperature, reaction pressure and molar ratio of Al/Cr on the activity and selectivity of the catalyst were investigated. The results show that when the reaction temperature is 25 鈩，

本文編號：1806466