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α,ω-二(4-溴甲基苯氧基)烷烃的合成 被引量:2
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作者 肖孝辉 钟林 《浙江师范大学学报(自然科学版)》 CAS 2007年第4期428-431,共4页
以乙醇或水为反应介质,通过对甲酚盐与α,ω-二溴代烷烃的亲核取代反应合成了α,ω-二(4-甲基苯氧基)烷烃系列产品,并以N-溴代丁二酰亚胺(NBS)作溴化试剂合成得到α,ω-二(4-溴甲基苯氧基)烷烃;通过元素分析和1H NMR等方法对目标化合物... 以乙醇或水为反应介质,通过对甲酚盐与α,ω-二溴代烷烃的亲核取代反应合成了α,ω-二(4-甲基苯氧基)烷烃系列产品,并以N-溴代丁二酰亚胺(NBS)作溴化试剂合成得到α,ω-二(4-溴甲基苯氧基)烷烃;通过元素分析和1H NMR等方法对目标化合物的结构进行了表征. 展开更多
关键词 α ω-(4-甲基苯氧基)烷烃 α ω-(4-溴甲基苯氧基)烷烃 N-溴代丁酰亚胺 对甲苯酚 α ω-溴代烷烃
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Zinc-modified Pt/SAPO-11 for improving the isomerization selectivity to dibranched alkanes 被引量:10
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作者 杨志超 柳云骐 +3 位作者 赵晋翀 苟建霞 孙凯安 刘晨光 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第3期509-517,共9页
Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,s... Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,scanning electron microscopy,nitrogen adsorption-desorption,pyridine-adsorbed infrared spectroscopy,temperature-programmed desorption of NH3,temperature-programmed reduction of hydrogen,temperature-programmed desorption of hydrogen,transmission electron microscopy,and X-ray photoelectron spectroscopy.The addition of zinc resulted in high dispersion of platinum.Zinc acted as a competitive adsorbent,changed the location of platinum.The catalyst with a zinc loading of 0.5%gave the highest selectivity to dimethylhexanes,but the conversion was lower than those achieved with the other catalysts.Dimethylhexanes have large molecular diameters,and therefore their diffusion may be difficult.This weakens the catalytic activity of the zinc-modified catalysts and lowers the n-octane conversion. 展开更多
关键词 Pt/SAPO-11 catalyst ZINC N-OCTANE HYDROISOMERIZATION Dibranched alkanes
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When does a diblock copolymer probe the interfacial rheological effect?
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作者 Jingfa Yang Jiang Zhao 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第10期1330-1334,共5页
Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. Fluorescence correlation spectroscopy was used to study the diffusion of fluo... Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. Fluorescence correlation spectroscopy was used to study the diffusion of fluorescence-labeled diblock copolymer,polystyrene-b-polyisoprene, at the interface formed between two immiscible liquids. The interfaces are formed between N,N-dimethylformamide(DMF) and a few immiscible liquids, n-alkane and polyisoprene. Interfacial diffusion coefficient of the diblock copolymer probe is found to decrease monotonously with the increase of the molecular length of the interface constituting liquids. The decrease of diffusion coefficient follows the prediction by Einstein relation using the viscosity of the constituting liquids as the variables only for interfaces between DMF and very small n-alkanes. For interfaces formed between DMF and bigger alkanes and especially between DMF and polyisoprene, the diffusion coefficient is much higher than the calculated value,indicating that the probe molecule starts to probe the much less viscous interfacial region because the interfacial width gets larger,whose thickness is comparable to the molecule size of the liquids. 展开更多
关键词 INTERFACES diffusion immiscible liquids single molecule fluorescence
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