The isomerization of n-pentane to generate high-quality blending components for clean gasoline was catalyzed by several amide-AlCl3-based ionic liquid(IL)analogs with various amides as donor molecules.The catalytic pe...The isomerization of n-pentane to generate high-quality blending components for clean gasoline was catalyzed by several amide-AlCl3-based ionic liquid(IL)analogs with various amides as donor molecules.The catalytic performance of these IL analogs was evaluated in a magnetic agitated autoclave operated in batch mode.IL analog based n-methylacetamide(NMA)-AlCl3 with the amide/AlCl3 molar ratio of 0.65 showed excellent performance toward n-pentane isomerization because 0.65 NMA-1.0 AlCl3 had a low viscosity and bidentate coordination structure.The influences of reaction time,reaction temperature,and stirring speed on the catalytic performance were also investigated.Optimal reaction conditions comprised the reaction time of 1 h,the reaction temperature of 40°C,and the stirring speed of 1500 r·min-1.Under optimal condition,the n-C5 conversion,research octane number(RON)increment,total liquids yield,and isoparaffin yield in isomerized oil were56.80%,13.51,89.90 wt%,and 44.32 wt%,respectively.A new mathematical model was constructed to predict the relationships among RON increment,RON increment/n-C5 conversion ratio,and n-C5 conversion.The new model indicated that an appropriate conversion per pass of n-C5 did not exceed 50%–55%.Various cycloparaffin additives were used to improve the catalytic performance of 0.65 NMA-1.0 AlCl3.The n-C5 conversion increased from 56.80%to 67.32%.The RON increment,total liquids yield,and isoparaffin yield reached 17.83,97.36 wt%,and 63.74 wt%,respectively.展开更多
The spectral structures of acetamide-AlCl_(3)-based ionic liquid(IL)analogs were determined in detail through IR,NMR,and Raman spectroscopy.IR spectroscopy showed that 0.65AA-1.0AlCl_(3) was the coordination structure...The spectral structures of acetamide-AlCl_(3)-based ionic liquid(IL)analogs were determined in detail through IR,NMR,and Raman spectroscopy.IR spectroscopy showed that 0.65AA-1.0AlCl_(3) was the coordination structure of Al and O atoms because of the resonance structure of acetamide.The mutual verification of the results of ^(27)Al NMR and ^(1)H NMR indicated that acetamide coexisted mainly in the form of cationic Al species and molecular Al species in xAA-1.0AlCl_(3),and AA/AlCl_(3) molar ratio affected the transformation of cationic Al species to molecular Al species.xAA-1.0AlCl_(3) was used as a green acidic catalyst for isobutene oligomerization,and the effects of AA/AlCl_(3) molar ratio,reaction temperature,reaction time,and volumetric ratio between IL analog and isobutene on product distribution were investigated.Optimal reaction conditions were AA/AlCl_(3) molar ratio of 0.75,reaction temperature of 60 C,reaction time of 30 min,and catalyst/i-C4¼volumetric ratio of 1.4 v/v.Under optimal conditions,isobutene conversion,(C8^(-)+C12^(-))selectivity,(C16^(-)+C20^(-))selectivity,and by-product selectivity were 85.26,80.20,6.80,and 13.00 wt%,respectively。展开更多
基金Supported by the National Natural Science Foundation of China(21802047)the Scientific Research Funds of Huaqiao University(600005-Z17Y0073).
文摘The isomerization of n-pentane to generate high-quality blending components for clean gasoline was catalyzed by several amide-AlCl3-based ionic liquid(IL)analogs with various amides as donor molecules.The catalytic performance of these IL analogs was evaluated in a magnetic agitated autoclave operated in batch mode.IL analog based n-methylacetamide(NMA)-AlCl3 with the amide/AlCl3 molar ratio of 0.65 showed excellent performance toward n-pentane isomerization because 0.65 NMA-1.0 AlCl3 had a low viscosity and bidentate coordination structure.The influences of reaction time,reaction temperature,and stirring speed on the catalytic performance were also investigated.Optimal reaction conditions comprised the reaction time of 1 h,the reaction temperature of 40°C,and the stirring speed of 1500 r·min-1.Under optimal condition,the n-C5 conversion,research octane number(RON)increment,total liquids yield,and isoparaffin yield in isomerized oil were56.80%,13.51,89.90 wt%,and 44.32 wt%,respectively.A new mathematical model was constructed to predict the relationships among RON increment,RON increment/n-C5 conversion ratio,and n-C5 conversion.The new model indicated that an appropriate conversion per pass of n-C5 did not exceed 50%–55%.Various cycloparaffin additives were used to improve the catalytic performance of 0.65 NMA-1.0 AlCl3.The n-C5 conversion increased from 56.80%to 67.32%.The RON increment,total liquids yield,and isoparaffin yield reached 17.83,97.36 wt%,and 63.74 wt%,respectively.
基金support of the National Natural Science Foundation of China(No.21802047)the Scientific Research Funds of Huaqiao University(No.600005-Z17Y0073),Xiamen,China.
文摘The spectral structures of acetamide-AlCl_(3)-based ionic liquid(IL)analogs were determined in detail through IR,NMR,and Raman spectroscopy.IR spectroscopy showed that 0.65AA-1.0AlCl_(3) was the coordination structure of Al and O atoms because of the resonance structure of acetamide.The mutual verification of the results of ^(27)Al NMR and ^(1)H NMR indicated that acetamide coexisted mainly in the form of cationic Al species and molecular Al species in xAA-1.0AlCl_(3),and AA/AlCl_(3) molar ratio affected the transformation of cationic Al species to molecular Al species.xAA-1.0AlCl_(3) was used as a green acidic catalyst for isobutene oligomerization,and the effects of AA/AlCl_(3) molar ratio,reaction temperature,reaction time,and volumetric ratio between IL analog and isobutene on product distribution were investigated.Optimal reaction conditions were AA/AlCl_(3) molar ratio of 0.75,reaction temperature of 60 C,reaction time of 30 min,and catalyst/i-C4¼volumetric ratio of 1.4 v/v.Under optimal conditions,isobutene conversion,(C8^(-)+C12^(-))selectivity,(C16^(-)+C20^(-))selectivity,and by-product selectivity were 85.26,80.20,6.80,and 13.00 wt%,respectively。
