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Sol-Gel法制备纳米TiO_2过程中水解pH值的影响及其性能表征 被引量:23
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作者 王瑞斌 戴松元 王孔嘉 《功能材料》 EI CAS CSCD 北大核心 2002年第3期296-297,302,共3页
采用钛酸四异丙酯 [Ti(i-OC3 H7) 4 ]水解法制备纳米TiO2 粉体 ,水解过程中有很多参数对纳米TiO2 的特性产生影响 ,通过控制制备过程中的水解pH值 ,可以得到不同粒径和不同晶型的纳米TiO2 粉体。本文主要探讨了纳米TiO2 晶型转变的条件... 采用钛酸四异丙酯 [Ti(i-OC3 H7) 4 ]水解法制备纳米TiO2 粉体 ,水解过程中有很多参数对纳米TiO2 的特性产生影响 ,通过控制制备过程中的水解pH值 ,可以得到不同粒径和不同晶型的纳米TiO2 粉体。本文主要探讨了纳米TiO2 晶型转变的条件和晶粒度Dhkl随pH值变化的趋势。并利用XRD、TEM对粉体颗粒的形貌、大小、物相组成进行分析。XRD分析研究表明 。 展开更多
关键词 水解 PH值 性能表征 纳米晶 溶相-凝胶法 二氧化钛
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Direct Synthesis of Diphenyl Carbonate with Heterogeneous Catalyst and Optimal Synthesis Conditions of the Support Prepared by Sol-gel Method 被引量:10
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作者 郭红霞 陈红萍 +3 位作者 梁英华 芮玉兰 吕敬德 付占达 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第2期223-227,共5页
The support of catalyst for the direct synthesis of diphenyl carbonate (DPC) by heterogeneous catalytic reaction was prepared by the sol-gel method. Compared with activated charcoal, molecular sieve, porous ceramics... The support of catalyst for the direct synthesis of diphenyl carbonate (DPC) by heterogeneous catalytic reaction was prepared by the sol-gel method. Compared with activated charcoal, molecular sieve, porous ceramics, hopcalite, the support prepared by the sol-gel method has higher activity. The characterization of the support by X-ray diffraction (XRD) and transmission electron microscope (TEM) show that the mare crystal phase is Co2MnO4 and the average particle diameter is about 40 nm. The optimum conditions for synthesis of the support were determined by orthogonal experiments, which indicate that the proportion of Cu, Mn, and Co is the first important factor influencing the yield and selectivity of DPC. Temperature of calcination is the second one. The optimum conditions are: molar proportion of Cu, Mn, and Co being 1 : 1 : 1, temperature of calcination 700℃, drying at 100~C, temperature of water bath 85~C. The yield and selectivity of DPC in the process can reach 38% and 99% in the batch operation, respectively. The copper cobalt manganese mixed oxides chosen as the support contribute more to the high catalytic activity than the sol-gel method. 展开更多
关键词 diphenyl carbonate heterogeneous catalyst sol-gel method optimum condition
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Synthesis of nanosize MnO_2 and its performence 被引量:1
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作者 顾大明 魏杰 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2003年第2期205-207,共3页
Sol sol gel method and solid phase redox reaction were respectively applied in preparation of Nanosize MnO 2 powders. The experiments showed that only Mn 2O 3 could be obtained from ignition of Mn(Ⅱ) in the muffle fu... Sol sol gel method and solid phase redox reaction were respectively applied in preparation of Nanosize MnO 2 powders. The experiments showed that only Mn 2O 3 could be obtained from ignition of Mn(Ⅱ) in the muffle furnace in air, and Mn 2O 3 had to be disproportionated in acids to gain MnO 2. The analysis of XRD and TEM technique revealed that the diameters of nanosize MnO 2 obtained by sol gel method was 35~45 nm and the x in MnO x was 1 9; the particle size of MnO 2 produced from solid phase redox reaction was 10~20 nm and the x in MnO x equaled 1 94. The test results have proved that the discharge property of alkaline manganese battery could be improved by nanosize MnO 2. 展开更多
关键词 solid phase synthesis sol gel nanosize MnO 2 discharge properties
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