A soybean oil derived biodiesel was prepared and blended with a conventional No. 0 petrodiesel. The pour points （PP） and the cold filter plugging points （CFPP） of biodiesel blends were evaluated on a low-temperatu...A soybean oil derived biodiesel was prepared and blended with a conventional No. 0 petrodiesel. The pour points （PP） and the cold filter plugging points （CFPP） of biodiesel blends were evaluated on a low-temperature flow tester. Dynamic viscosities of the blends at different temperatures and different shear rates were measured on a rotary rheometer. The crystal morphologies of biodiesel blends at low temperatures were analyzed using a polarizing microscope. The results indicated that blended fuels demonstrated slight decrease in PPs and CFPPs as compared with those of neat soybean oil derived biodiesel and pure petrodiesel. Below the temperatures of PPs or CFPPs, the dynamic viscosity of biodiesel blends dramatically increased with a decreasing temperature, but decreased with an increasing shear rate, so that biodiesel blends exhibited non-Newtonian behavior. At temperatures higher than PPs or CFPPs, a linear relationship appeared between the dynamic viscosity and shear rate and biodiesel blends became Newtonian fluids. At low temperatures, wax crystals of biodiesel blends grew and agglomerated rapidly. Loss of fluidity for biodiesel blends at low temperatures could therefore be attributed on one hand to the sharp increase of viscosity and on the other hand to the rapid growth and agglomeration of wax crystals.展开更多
据东京工业大学网站7月25日消息,日本东京工业大学(Tokyo Institute of Technology)的研究人员开发出合成氧化锰八面体分子筛(OMS-1)纳米粒子的简单方法。研究人员开发出“固态转化方法”,即先将MnO^(4-)和Mn^(2+)试剂以特定比例混合,...据东京工业大学网站7月25日消息,日本东京工业大学(Tokyo Institute of Technology)的研究人员开发出合成氧化锰八面体分子筛(OMS-1)纳米粒子的简单方法。研究人员开发出“固态转化方法”,即先将MnO^(4-)和Mn^(2+)试剂以特定比例混合,调整混合物的pH值并收集沉淀物(主要由低结晶度镁-布氏石组成),再将沉淀物在200℃下煅烧24 h转化为OMS-1纳米颗粒。展开更多
基金Project (20110491562) supported by China Postdoctoral Science FoundationProjects (2011GN043, 2012ZD002) supported by Independent Innovation Foundation of Shandong University,ChinaProject (ZR2009FM023) supported by Shandong Provincial Natural Science Foundation of China
基金the financial support of the Natural Science Foundation of Chongqing(project No.CSTC2006BA6031)the Program for New Century Excellent Talents in Chinese Universities(project No.NCET-04-1002)
文摘A soybean oil derived biodiesel was prepared and blended with a conventional No. 0 petrodiesel. The pour points （PP） and the cold filter plugging points （CFPP） of biodiesel blends were evaluated on a low-temperature flow tester. Dynamic viscosities of the blends at different temperatures and different shear rates were measured on a rotary rheometer. The crystal morphologies of biodiesel blends at low temperatures were analyzed using a polarizing microscope. The results indicated that blended fuels demonstrated slight decrease in PPs and CFPPs as compared with those of neat soybean oil derived biodiesel and pure petrodiesel. Below the temperatures of PPs or CFPPs, the dynamic viscosity of biodiesel blends dramatically increased with a decreasing temperature, but decreased with an increasing shear rate, so that biodiesel blends exhibited non-Newtonian behavior. At temperatures higher than PPs or CFPPs, a linear relationship appeared between the dynamic viscosity and shear rate and biodiesel blends became Newtonian fluids. At low temperatures, wax crystals of biodiesel blends grew and agglomerated rapidly. Loss of fluidity for biodiesel blends at low temperatures could therefore be attributed on one hand to the sharp increase of viscosity and on the other hand to the rapid growth and agglomeration of wax crystals.
文摘据东京工业大学网站7月25日消息,日本东京工业大学(Tokyo Institute of Technology)的研究人员开发出合成氧化锰八面体分子筛(OMS-1)纳米粒子的简单方法。研究人员开发出“固态转化方法”,即先将MnO^(4-)和Mn^(2+)试剂以特定比例混合,调整混合物的pH值并收集沉淀物(主要由低结晶度镁-布氏石组成),再将沉淀物在200℃下煅烧24 h转化为OMS-1纳米颗粒。
