The processing of an energy carrier such as microalgae oil into valuable fuels and chemicals is quite promising.Aqueous-phase processing is suitable for this purpose because the separation of intrinsic water from the ...The processing of an energy carrier such as microalgae oil into valuable fuels and chemicals is quite promising.Aqueous-phase processing is suitable for this purpose because the separation of intrinsic water from the algae cell is difficult.In this study,we synthesized ruthenium(Ru)nanoparticles supported on highly hydrophilic mesoporous carbon to catalyze the quantitative hydrodeoxygenation(HDO)of microalgae oil to alkanes in a one-pot process at a low temperature(140℃)in the aqueous phase.The mesoporous carbon was obtained by single-step calcination of starch and zinc chloride in nitrogen.The as-obtained carbon showed high surface areas and pore volumes,allowing high dispersion of Ru nanoparticles.The surface of the carbon material was rich in hydroxyl groups,as evidenced by X-ray photoelectron spectroscopy(XPS),infrared(IR)spectroscopy,and thermogravimetric analysis(TGA)measurements.As a result,the carbon material contacted preferably with the water phase versus the organic phase,improving the accessibility of substrates.On the other hand,the contact angle test results speculated the superior hydrophilic nature of mesoporous Ru/C(ZnCl2,starch)than commercial Ru/C.Both kinetics modeling and in situ IR monitoring in water revealed the superior performance of the hydrophilic mesoporous and hydrophilic Ru/C compared to a commercial Ru/C for the tandem hydrogenation of stearic acid and decarbonylation of stearyl alcohol.The herein designed hydrothermal carbon material was highly active,environmentally benign,sustainable,and recyclable material,and could be potentially used for other hydrogenation reactions in the aqueous phase.展开更多
目的建立银杏叶药材中白果新酸(C13∶0)、白果酸(C15∶1)、十七烷二烯银杏酸(C17∶2)、氢化白果酸(C15∶0)和十七烷一烯银杏酸(C17∶1)等5种银杏酚酸类成分的含量测定方法。方法采用HPLC法。色谱柱为Phenomenex Luna C18(4.6mm×250...目的建立银杏叶药材中白果新酸(C13∶0)、白果酸(C15∶1)、十七烷二烯银杏酸(C17∶2)、氢化白果酸(C15∶0)和十七烷一烯银杏酸(C17∶1)等5种银杏酚酸类成分的含量测定方法。方法采用HPLC法。色谱柱为Phenomenex Luna C18(4.6mm×250 mm,5μm)色谱柱,以乙腈-0.1%磷酸(90∶10)为流动相,流速为1.0 m L·min-1,检测波长为310 nm,柱温为30℃。结果白果新酸(C13∶0)、白果酸(C15∶1)和十七烷一烯银杏酸(C17∶1)质量浓度分别在1.47~29.40、6.05~121.00、8.00~160.00μg·m L-1内呈良好线性关系,相关系数分别为0.999 9、0.999 9和0.999 9,平均回收率分别为98.6%(RSD=2.57%,n=9)、100.1%(RSD=2.36%,n=9)、97.4%(RSD=2.99%,n=9),建立了十七烷二烯银杏酸(C17∶2)、氢化白果酸(C15∶0)相对定量分析方法。结论该方法简便、准确、重现性好,可用于银杏叶的质量控制。不同产地、不同采收期的银杏叶药材中5种银杏酚酸类指标成分含量差异较大。展开更多
讨论了正十七烷与正十八烷(C_(17),C_(18))对燃料运动黏度、密度、表面张力理化性能的影响,探究了直链烷烃对SMD(Sauter mean diameter)的影响.将Key's混合规律、Tat混合规律和多项式拟合应用于密度公式的拟合,并将Key's混合规...讨论了正十七烷与正十八烷(C_(17),C_(18))对燃料运动黏度、密度、表面张力理化性能的影响,探究了直链烷烃对SMD(Sauter mean diameter)的影响.将Key's混合规律、Tat混合规律和多项式拟合应用于密度公式的拟合,并将Key's混合规律与对数拟合应用于运动黏度公式的拟合,得出的理化性能拟合公式精度较高;通过测量纯煤油及C_(17),C_(18)混合油雾化的SMD,实验发现随着直链烷烃的质量分数的增加,混合油的运动黏度增加,SMD也随之增加,雾化效果与纯航空煤油的相比较差,而C_(18)混合油的SMD要比C_(17)混合油要大,并且利用密度、运动黏度的拟合公式对SMD进行预测的偏差小于0.3%.展开更多
文摘The processing of an energy carrier such as microalgae oil into valuable fuels and chemicals is quite promising.Aqueous-phase processing is suitable for this purpose because the separation of intrinsic water from the algae cell is difficult.In this study,we synthesized ruthenium(Ru)nanoparticles supported on highly hydrophilic mesoporous carbon to catalyze the quantitative hydrodeoxygenation(HDO)of microalgae oil to alkanes in a one-pot process at a low temperature(140℃)in the aqueous phase.The mesoporous carbon was obtained by single-step calcination of starch and zinc chloride in nitrogen.The as-obtained carbon showed high surface areas and pore volumes,allowing high dispersion of Ru nanoparticles.The surface of the carbon material was rich in hydroxyl groups,as evidenced by X-ray photoelectron spectroscopy(XPS),infrared(IR)spectroscopy,and thermogravimetric analysis(TGA)measurements.As a result,the carbon material contacted preferably with the water phase versus the organic phase,improving the accessibility of substrates.On the other hand,the contact angle test results speculated the superior hydrophilic nature of mesoporous Ru/C(ZnCl2,starch)than commercial Ru/C.Both kinetics modeling and in situ IR monitoring in water revealed the superior performance of the hydrophilic mesoporous and hydrophilic Ru/C compared to a commercial Ru/C for the tandem hydrogenation of stearic acid and decarbonylation of stearyl alcohol.The herein designed hydrothermal carbon material was highly active,environmentally benign,sustainable,and recyclable material,and could be potentially used for other hydrogenation reactions in the aqueous phase.
文摘讨论了正十七烷与正十八烷(C_(17),C_(18))对燃料运动黏度、密度、表面张力理化性能的影响,探究了直链烷烃对SMD(Sauter mean diameter)的影响.将Key's混合规律、Tat混合规律和多项式拟合应用于密度公式的拟合,并将Key's混合规律与对数拟合应用于运动黏度公式的拟合,得出的理化性能拟合公式精度较高;通过测量纯煤油及C_(17),C_(18)混合油雾化的SMD,实验发现随着直链烷烃的质量分数的增加,混合油的运动黏度增加,SMD也随之增加,雾化效果与纯航空煤油的相比较差,而C_(18)混合油的SMD要比C_(17)混合油要大,并且利用密度、运动黏度的拟合公式对SMD进行预测的偏差小于0.3%.
