排序方式: 共有84条查询结果,搜索用时 15 毫秒
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Li2ZrO3材料吸收CO2性能的进一步研究 总被引:8,自引:0,他引:8
用不同结构的ZrO2合成了一系列在高温下吸收CO2的Li2ZrO3材料,并详细的研究了反应物质的物理和化学性质对生成物吸收CO2性能的影响。采用SEM、XRD以及TG分析法分别进行了材料结构及其吸收CO2性能的表征,并使用XPS法测定了材料表面的元素组成。实验结果表明,使用不同结构的ZrO2合成的Li2ZrO3,其吸收CO2的性能明显的不同。用ZrO2(t)(四方)合成的Li2ZrO3吸收CO2的速度快,在500 ℃下,20% CO2(80%空气)的气氛中保持3h,其吸收量可达25(±0.6)%(wt),而以ZrO2(m)(单斜)为原料制备的Li2ZrO3在上述吸收条件下重量仅增加9(±0.6)%(wt)。此外,实验结果还表明化学元素的掺杂对用ZrO2(m)合成的Li2ZrO3的CO2吸收速度及吸收容量影响较大。 相似文献
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Eu3+掺杂SiO2-B2O3-NaF玻璃的制备及发光性质 总被引:1,自引:0,他引:1
The Eu-doped SiO2-B2O3-NaF glass was prepared by sol-gel process, using tetraethoxy Silicane, boric acid and sodium fluoride as starting materials, 0.10 mol·L-1 EuCl3 solution as the dopant. The luminescent properties of Eu3+ doped SiO2-B2O3-NaF phosphors were investigated. The phosphors showed prominent luminescence in pink, the strong emission of Eu3+ comes from electronic transition of 5D0- 7F1(591 nm)and 5D0- 7F2(615 nm),which derived from two transition modes of magnetic-dipole and electric-dipole .The peak intensity of 591nm in SiO2-B2O3-NaF matrix is much stronger than it in the other matrixes, it means that SiO2-B2O3-NaF has sensitization on the transition of 5D0- 7F1 (Eu3+). If there are broad bonds in the range of 275~380 nm in the excitation spectrum of Eu3+ -doped SiO2-B2O3-NaF glass, the emission peak intensity should be intensified. It is because the electron migration CT band of O2--Eu3+. For all Eu3+ concentrations used, the investigation found that when the mass of fraction got to 29.19×10-3, the luminescence intensity reached the summit. And there is a phenomenon of concentration quenching. Investigation with the same concentration of Eu3+ at different annealed temperature, we found that the sample annealed at 400 ℃, the luminescence intensity achieved its maximum value, and Eu3+ in this matrix had a phenomenon of temperature quenching. The structural characterization of these luminescent materials was carried by used XRD and TEM. The result showed that the phosphor was in amorphous phase. 相似文献
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本文研究了以一系列离子液体作为介质时,萃取剂二环己基18冠6(DCH18C6)对水相中Sr^2+的萃取行为.研究结果表明,DCH18C6/离子液体体系对Sr^2+的萃取性能优于相应的DCH18C6/JE辛醇萃取体系,一定条件下其萃取Sr^2+的分配比可达10^3量级.同时,体系对Sr^2+的萃取性能随着离子液体的结构不同而有所差别.在离子液体萃取体系中,随着水相初始硝酸浓度的增加,对Sr^2+的萃取性能下降.水相中Na^+、K^+等离子的存在也会对体系萃取Sr^2+产生直接影响.本文还验证了离子液体体系萃取Sr^2+的机理,即以阳离子交换机理为主实现对Sr^2+的萃取. 相似文献
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采用BP神经网络优化间二硝基苯催化加氢的反应条件 总被引:1,自引:0,他引:1
采用BP神经网络对间二硝基苯液相催化加氢制备间苯二胺的反应条件进行优化. 首先利用均匀设计的实验结果,采用LM算法对BP神经网络进行训练. 再利用训练好的BP神经网络对各种实验因素水平组合条件下间二硝基苯的转化率和间苯二胺的收率进行预测. 结果表明,采用苯作溶剂时,间二硝基苯的转化率较高; 采用乙醇作溶剂时,间苯二胺的收率较高; 当采用乙醇为溶剂,催化剂用量为20%,反应温度和压力分别为365 K和2.9 MPa时反应效果较好,间苯二胺的收率高达95.8%. 进一步的实验验证表明,用神经网络模型模拟的结果与实验结果基本吻合. 相似文献
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高温下锆酸锂吸收二氧化碳的研究 总被引:15,自引:0,他引:15
Li2ZrO3 to be used as a CO2 absorbent at 450℃ to 710℃ is synthesized. The results indicate that the loading capacity of Li2ZrO3 for CO2 is slightly improved than that reported previously. The absorption capacity attain to about 25(±0.6)%(wt)at 500℃ kept 3h in an atmosphere containing 20% CO2 (balanced by air). Moreover, the temperature of synthesis is lower than the temperature reported in the literature, and also the time of synthesis is shorter. 相似文献
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对苯二酚合成方法的研究进展 总被引:10,自引:0,他引:10
对苯二酚是一种重要的化工原料和中间体。本文综述了目前国内外对苯二酚合成方法的研究进展,特别对苯酚过氧化氢羟基化法这一洁净合成方法及其所用催化剂的种类和性能进行了较为详尽的综述。 相似文献
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