The diversities of hydrogen sorption properties of Mg2FeH6-based complexes with and without TiO2 were investigated. Mg2FeH6-based complexes with and without TiO2 were synthesized respectively by reactive mechanical al...The diversities of hydrogen sorption properties of Mg2FeH6-based complexes with and without TiO2 were investigated. Mg2FeH6-based complexes with and without TiO2 were synthesized respectively by reactive mechanical alloying,and hydrogen sorption properties of the complexes were examined by Sieverts-type apparatus. The results show that the sample without TiO2 releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H2 pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H2 pressure. But for the sample with TiO2 addition under the same condition,it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO2 are determined to be 71.2 and 80.3 kJ/(mol.K),respectively. The improvement in hydrogen sorption rate and and reduction in activation energy can be attributed to the addition of TiO2.展开更多
本研究对14个小麦品种在5个温度(10、20、25、30、35℃)和RH 11.3%~96%范围内进行测定,并采用CAE方程进行拟合,决定系数(R2)>0.998,平均相对百分率误差(MRE)<2.951%。对于小麦解吸和吸附等温线,CAE方程拟合的5个参数中B1和B2差异...本研究对14个小麦品种在5个温度(10、20、25、30、35℃)和RH 11.3%~96%范围内进行测定,并采用CAE方程进行拟合,决定系数(R2)>0.998,平均相对百分率误差(MRE)<2.951%。对于小麦解吸和吸附等温线,CAE方程拟合的5个参数中B1和B2差异显著,不同类型小麦之间对应的CAE方程系数是相似的。不同类型的小麦品种收获后可以同时处理,但其吸附和解吸行为应当分别对待。智能化粮情检测、通风窗口控制、小麦CAE平衡水分方程组成控制系统指定仓库通风。在计算机显示系统,通风窗口由小麦吸附平衡绝对湿度曲线、饱和绝对湿度曲线、通风上限温度(通风开始时为粮堆温度减去8℃,通风进行时为粮堆温度减去4℃)线组成窗口,当大气状态点位于这个窗口内,轴流小风机被启动运转,粮堆降温通风开始。当大气状态点位于这个窗口外,轴流小风机被停止,粮堆降温通风结束。在2015年12月16日—28日,这个系统用于河北清苑国家粮食储备库14号房式仓(小麦5 900 t,含水量11.5%),下行吸出式通风降温7.4℃,3台1.5 k W轴流风机运转累计用电800 k W,单位能耗0.018 k Wh t-1℃-1,节省电能55%。14号整仓裂纹破碎率均值为(3.66±0.22)%,显著低于使用4台5.5 k W离心风机的10号仓(4.30±0.28)%。2016年12月27日—2017年1月16日在山东齐河军粮库7号房式仓(小麦3089 t,含水量12.5%),采用2台0.85 k W轴流风机上行吸出式通风,平均粮温下降9.2℃,风机运转265.5 h,用电451.4 k Wh,单位能耗0.015 9 k Wh t-1℃-1,节省电能60%。展开更多
Experimental results indicated that the resin of 4-aminopyridine （4-APR） showed good ability to adsorb Mo（Ⅵ） at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo（Ⅵ）·（...Experimental results indicated that the resin of 4-aminopyridine （4-APR） showed good ability to adsorb Mo（Ⅵ） at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo（Ⅵ）·（g resin）-1,Mo（Ⅵ） adsorbed on 4-APR could be eluted by 3 mol·L-1 HCl or 3 mol·L-1 NaOH quantitatively. The sorption rate constants determined at various temperatures were respectively k15℃=2.24×10-5 s-1,k25℃=3.30×10-5 s-1,k35℃=4.79×10-5 s-1,and k45℃=6.85×10-5 s-1.The sorption apparent activation energy Ea was 29.1 kJ·mol-1.The sorption mechanism showed that the nitrogen atoms of the functional group of 4-APR coordinated with Mo（Ⅵ） to form coordination bonds,and the coordination molar ratio of [4-AP] to Mo（Ⅵ） was 1∶2.展开更多
基金Project (50574105) supported by the National Natural Science Foundation of ChinaProject (NCET-06-0683) supported by the Program for the New Century Excellent Talents in University+1 种基金Project (08-030239) supported by the Program for 121 Excellent Talents in Hunan ProvinceProject (07MX21) supported by Mittal Student Innovation Foundation of Central South University
文摘The diversities of hydrogen sorption properties of Mg2FeH6-based complexes with and without TiO2 were investigated. Mg2FeH6-based complexes with and without TiO2 were synthesized respectively by reactive mechanical alloying,and hydrogen sorption properties of the complexes were examined by Sieverts-type apparatus. The results show that the sample without TiO2 releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H2 pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H2 pressure. But for the sample with TiO2 addition under the same condition,it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO2 are determined to be 71.2 and 80.3 kJ/(mol.K),respectively. The improvement in hydrogen sorption rate and and reduction in activation energy can be attributed to the addition of TiO2.
文摘本研究对14个小麦品种在5个温度(10、20、25、30、35℃)和RH 11.3%~96%范围内进行测定,并采用CAE方程进行拟合,决定系数(R2)>0.998,平均相对百分率误差(MRE)<2.951%。对于小麦解吸和吸附等温线,CAE方程拟合的5个参数中B1和B2差异显著,不同类型小麦之间对应的CAE方程系数是相似的。不同类型的小麦品种收获后可以同时处理,但其吸附和解吸行为应当分别对待。智能化粮情检测、通风窗口控制、小麦CAE平衡水分方程组成控制系统指定仓库通风。在计算机显示系统,通风窗口由小麦吸附平衡绝对湿度曲线、饱和绝对湿度曲线、通风上限温度(通风开始时为粮堆温度减去8℃,通风进行时为粮堆温度减去4℃)线组成窗口,当大气状态点位于这个窗口内,轴流小风机被启动运转,粮堆降温通风开始。当大气状态点位于这个窗口外,轴流小风机被停止,粮堆降温通风结束。在2015年12月16日—28日,这个系统用于河北清苑国家粮食储备库14号房式仓(小麦5 900 t,含水量11.5%),下行吸出式通风降温7.4℃,3台1.5 k W轴流风机运转累计用电800 k W,单位能耗0.018 k Wh t-1℃-1,节省电能55%。14号整仓裂纹破碎率均值为(3.66±0.22)%,显著低于使用4台5.5 k W离心风机的10号仓(4.30±0.28)%。2016年12月27日—2017年1月16日在山东齐河军粮库7号房式仓(小麦3089 t,含水量12.5%),采用2台0.85 k W轴流风机上行吸出式通风,平均粮温下降9.2℃,风机运转265.5 h,用电451.4 k Wh,单位能耗0.015 9 k Wh t-1℃-1,节省电能60%。
文摘Experimental results indicated that the resin of 4-aminopyridine （4-APR） showed good ability to adsorb Mo（Ⅵ） at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo（Ⅵ）·（g resin）-1,Mo（Ⅵ） adsorbed on 4-APR could be eluted by 3 mol·L-1 HCl or 3 mol·L-1 NaOH quantitatively. The sorption rate constants determined at various temperatures were respectively k15℃=2.24×10-5 s-1,k25℃=3.30×10-5 s-1,k35℃=4.79×10-5 s-1,and k45℃=6.85×10-5 s-1.The sorption apparent activation energy Ea was 29.1 kJ·mol-1.The sorption mechanism showed that the nitrogen atoms of the functional group of 4-APR coordinated with Mo（Ⅵ） to form coordination bonds,and the coordination molar ratio of [4-AP] to Mo（Ⅵ） was 1∶2.
