共查询到12条相似文献,搜索用时 90 毫秒
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Li+(K+)/CO32-,B4O72--H2O三元体系288K相平衡研究 总被引:1,自引:0,他引:1
采用等温溶解平衡法研究了二个三元体系Li+ (K+ ) /CO32 - ,B4 O72 - -H2 O 2 88K时的相平衡及平衡液相的主要物化性质 (密度、电导率、pH)。研究发现 :这二个三元体系均为简单共饱和型 ,无复盐及固溶体形成 ;根据溶解度数据绘制了相图 ,相图中单变量曲线所对应的平衡固相分别为 :Li2 CO3,Li2 B4 O7·3H2 O ;K2 CO3·3 /2H2 O ,K2 B4 O7·4H2 O ;K2 CO3对K2 B4 O7有强烈的盐析作用 ,简单讨论了物化性质的变化规律 相似文献
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复合纳米微粒Rh3+/TiO2/SnO2的合成、表征及光催化降解4—(2—吡啶偶氮)间苯二酚的研究 总被引:19,自引:4,他引:19
采用溶胶-凝胶法制备复合纳米微粒Rh3+/TiO2/SnO2作系列光催化剂,运用BET、XRD等技术对样品进行了表征.讨论了影响污染物4-(2-吡啶偶氮)间苯二酚(PAR)光催化降解率的主要因素,实验结果表明:以Rh3+/TiO2/SnO2为复合光催化剂,当m(TiO2)∶m(SnO2)=56∶44,ω(Rh3+)=2.0%,催化剂用量为1.0 g,通入空气的流量为10.0 L/min,试液的质量分数为2.0×10-6,pH=7.0时,光照2 h,PAR的降解率达到96.2%. 相似文献
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探讨了采用固相反应法合成碱土金属Sr、Mg与过渡金属Fe复合掺杂的镓酸镧基ABO。型氧化物La0.8sSr0.2Ga0.75Mg0.20Fe0.05O2.815(LSGMF);利用热分析仪、EDS、XRD、SEM、直流四端子法等对LSGMF复合氧化物的形成过程、微区成分、晶体结构、显微组织及导电性等进行研究。分析表明:样品的烧结温度不能低于1300℃;EDS结果证实合成的LSGMF样品中杂质元素很少,纯度较高;XRD分析表明:经1350℃烧结合成的LSGMF样品中出现了LaSrGa3O7和LaSrGaO4等杂相,而经1400℃烧结则获得了单一正交钙钛矿结构;电性能测试结果表明:在400—850℃温度区间,其电导率与温度的关系符合Arrhenius定律,说明合成的复合氧化物LSGMF为氧离子导体,且离子迁移活化能0.6656eV(〈leV);Sr、Mg和Fe复合掺杂氧化物LSGMF与仅Sr、Mg双掺杂氧化物LSGM相比具有更高的离子电导率,说明少量过渡金属Fe的掺杂,可提高离子电导率。 相似文献
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载钯TiO2半导体悬浮催化体系中CO2的光还原 总被引:5,自引:0,他引:5
在半导体光催化还原CO2的反应过程中,一般都伴有氢气的产生[1,2].为了提高CO2还原产物的收率,必须设法抑制析氢过程.在催化剂表面担载某种吸氢物质是抑制氢气产生的有效方法之一.理想的吸氢物质不仅能吸附氢,且被其吸附的氢还具有还原CO2的能力.Go... 相似文献
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This is an experimental study on the drag reduction phenomenon in a gas-particle suspension two-phase flow system. The purpose of the research was to examine the effect of static charges carried by the conveyed particles on the drag reduction characteristics of a flowing suspension in horizontal and vertical tubes. A specifically designed experimental loop was used to perform simultaneous pressure drop and particle charge measurements. The charge on the particles flowing in the system was artificially increased using high voltage rod-in-cylinder Corona chargers mounted in the closed loop. The particle charge was measured in a Farraday cage sampling device and the effective current generated by particle impact on a specially designed spherical nickel probe mounted in the two-phase flow was also recorded.
It was found during the measurements that the pressure drop in the vertical test section was not significantly influenced by the charge build-up on the flowing particles, while the results obtained in the horizontal test section showed a significant effect on the drag due to charged particles. The electric charge on the particles was shown to have a negative contribution on the drag reduction: the higher the value of the effective charge, the higher the drag increase, i.e., the smaller the drag reduction. 相似文献
It was found during the measurements that the pressure drop in the vertical test section was not significantly influenced by the charge build-up on the flowing particles, while the results obtained in the horizontal test section showed a significant effect on the drag due to charged particles. The electric charge on the particles was shown to have a negative contribution on the drag reduction: the higher the value of the effective charge, the higher the drag increase, i.e., the smaller the drag reduction. 相似文献
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碳酸钙在HDPE/CaCO3体系中的分散状况研究 总被引:13,自引:0,他引:13
采用不同种类的分散剂对三种不同粒径、不同表面形态的碳酸钙在HDPE中的分散效果进行了,并对复合材料进行了力学性能对比和冲击断面扫描电镜观察。结果表明,Ca-CO3在HDPE中分散的好坏对复合材料的性能有极大影响,分散的种类和添加量是改善碳酸钙在HDPE中分散性,获得增强增韧效果的关键。 相似文献
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1 INTRODUCTIONTemperature-Programmed Reduction(TPR)is widely used in the study of the reduc-tion properties of catalysts[1-4].It does not depend on any specific property exceptthe reducibility of the catalyst.Parameters of the TPR profile,such as peaktemperature,peak area and peak width,are capable of providing certain indications onthe original state of the reduced species,the interaction effects between active compo-nents and promoter or supporter,and other reduction properties of the catalyst. 相似文献
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半导体悬浮体系光催化分解有机磷化合物 总被引:14,自引:1,他引:14
本文研究了半导体悬浮体系光催化分解有机磷化合物的条件,只有在光照、催化剂和氧同时存在的条件下才能有效地光催化分解有机磷化合物;测量了两种有机磷化合物在各种半导体催化剂上的分解速率,反应速率与催化剂的种类和表面性质有关;对光催化分解马拉硫磷的反应机理进行了初步探讨。 相似文献