Organically modified MSU- x mesophases containing phenyl, ureidopropyl and methyl along with phenyl two moieties were directly prepared by one- pot synthesis method. Their texture and surface properties were character...Organically modified MSU- x mesophases containing phenyl, ureidopropyl and methyl along with phenyl two moieties were directly prepared by one- pot synthesis method. Their texture and surface properties were characterized by means of XRD, HRTEM, FT- IR, N2 adsorption/desorption, 29Si CPMAS NMR、 13C CPMAS NMR and the microscopic structure was also characterized by small angle X- ray scattering (SAXS) using synchrotron radiation as X- ray source. The results showed that SAXS profiles were hardly constant with Porod′ s law showing a negative slope, i.e. negative deviations (see fig.3). This suggested that the organic groups covalently linked with the matrix of mesoporous silica formed an interfacial layers, which led to the scattering of the pore distortion and gave a negative diviation from Porod′ s law. The average thickness of the interfacial layer in each sample was further obtained by analyzing this deviation. SAXS analysis also showed that the organically functionalized MSU- X displayed mass fractal and the uniform distribution of the organic groups within the mesoporous channels, implying that it′ s formation was a non- equilibrium and non- linear process.展开更多
采用自制的高比表面MSU介孔分子筛为载体,制备了系列歧化催化剂,对其进行XRD、N2吸附-脱附、H2-TPR和29Si MAS NMR表征,并评价了其1-丁烯歧化反应性能。结果显示高比表面载体和合适的WO3负载量有利于提高活性组分在载体表面的分散度,从...采用自制的高比表面MSU介孔分子筛为载体,制备了系列歧化催化剂,对其进行XRD、N2吸附-脱附、H2-TPR和29Si MAS NMR表征,并评价了其1-丁烯歧化反应性能。结果显示高比表面载体和合适的WO3负载量有利于提高活性组分在载体表面的分散度,从而抑制了烯烃双键异构化反应,提高歧化反应的活性和选择性。在400℃、0.5MPa,1-丁烯的质量空速为10h-1的反应条件下,1-丁烯自动歧化反应的转化率可达50%,目标产物(乙烯+丙烯+己烯)选择性达80%以上。展开更多
利用美国大气海洋局卫星应用和研究实验室(The Center for Satellite Applications and Research,STAR)提供的MSU/AMSU卫星微波亮温资料V3.0版本,结合三套再分析资料数据集,通过对海洋上空不同高度、不同区域及不同季节的适用性分析,来...利用美国大气海洋局卫星应用和研究实验室(The Center for Satellite Applications and Research,STAR)提供的MSU/AMSU卫星微波亮温资料V3.0版本,结合三套再分析资料数据集,通过对海洋上空不同高度、不同区域及不同季节的适用性分析,来探讨MSU/AMSU资料在热带海洋区域高空大气的温度变化特征,并通过合成分析揭示亮温资料与海洋的响应关系,从而探讨MSU/AMSU资料在热带海洋区域上的适用性和科学性。结果表明:(1)MSU/AMSU亮温资料在30°E^70°W,15°S^15°N范围的热带海洋区域适用性较好;(2)热带海洋区域对流层上层和中层大气均呈增温趋势,变化速率分别为0.045 K/(10 a)和0.107 K/(10 a),增温突变现象出现在1980年代末—1990年代初,平流层低层大气呈降温趋势,变化速率为-0.345 K/(10 a),降温突变现象出现在1990年代中期;(3)在热带海洋区域,高空大气温度的变化趋势具有较强的区域性特征,相对于中东太平洋而言,印度洋-西太平洋区域的增、降温趋势变化更显著。对流层的增温幅度随高度的升高而有所降低。平流层低层的降温趋势在季节内变化不大,而对流层则是秋、冬季的增温趋势要明显大于春、夏季,冬季的增温尤为明显;(4)MSU/AMSU亮温资料对热带海洋温度异常有很好的响应关系,能在弥补海洋区域观测资料稀缺的情况下,对海洋区域起着较好的监测作用。展开更多
文摘Organically modified MSU- x mesophases containing phenyl, ureidopropyl and methyl along with phenyl two moieties were directly prepared by one- pot synthesis method. Their texture and surface properties were characterized by means of XRD, HRTEM, FT- IR, N2 adsorption/desorption, 29Si CPMAS NMR、 13C CPMAS NMR and the microscopic structure was also characterized by small angle X- ray scattering (SAXS) using synchrotron radiation as X- ray source. The results showed that SAXS profiles were hardly constant with Porod′ s law showing a negative slope, i.e. negative deviations (see fig.3). This suggested that the organic groups covalently linked with the matrix of mesoporous silica formed an interfacial layers, which led to the scattering of the pore distortion and gave a negative diviation from Porod′ s law. The average thickness of the interfacial layer in each sample was further obtained by analyzing this deviation. SAXS analysis also showed that the organically functionalized MSU- X displayed mass fractal and the uniform distribution of the organic groups within the mesoporous channels, implying that it′ s formation was a non- equilibrium and non- linear process.
文摘采用自制的高比表面MSU介孔分子筛为载体,制备了系列歧化催化剂,对其进行XRD、N2吸附-脱附、H2-TPR和29Si MAS NMR表征,并评价了其1-丁烯歧化反应性能。结果显示高比表面载体和合适的WO3负载量有利于提高活性组分在载体表面的分散度,从而抑制了烯烃双键异构化反应,提高歧化反应的活性和选择性。在400℃、0.5MPa,1-丁烯的质量空速为10h-1的反应条件下,1-丁烯自动歧化反应的转化率可达50%,目标产物(乙烯+丙烯+己烯)选择性达80%以上。
文摘利用美国大气海洋局卫星应用和研究实验室(The Center for Satellite Applications and Research,STAR)提供的MSU/AMSU卫星微波亮温资料V3.0版本,结合三套再分析资料数据集,通过对海洋上空不同高度、不同区域及不同季节的适用性分析,来探讨MSU/AMSU资料在热带海洋区域高空大气的温度变化特征,并通过合成分析揭示亮温资料与海洋的响应关系,从而探讨MSU/AMSU资料在热带海洋区域上的适用性和科学性。结果表明:(1)MSU/AMSU亮温资料在30°E^70°W,15°S^15°N范围的热带海洋区域适用性较好;(2)热带海洋区域对流层上层和中层大气均呈增温趋势,变化速率分别为0.045 K/(10 a)和0.107 K/(10 a),增温突变现象出现在1980年代末—1990年代初,平流层低层大气呈降温趋势,变化速率为-0.345 K/(10 a),降温突变现象出现在1990年代中期;(3)在热带海洋区域,高空大气温度的变化趋势具有较强的区域性特征,相对于中东太平洋而言,印度洋-西太平洋区域的增、降温趋势变化更显著。对流层的增温幅度随高度的升高而有所降低。平流层低层的降温趋势在季节内变化不大,而对流层则是秋、冬季的增温趋势要明显大于春、夏季,冬季的增温尤为明显;(4)MSU/AMSU亮温资料对热带海洋温度异常有很好的响应关系,能在弥补海洋区域观测资料稀缺的情况下,对海洋区域起着较好的监测作用。
