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结合水对二氧化铅还原反应的影响
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作者 闫智刚 《电动自行车》 2012年第9期20-23,共4页
采用循环伏安、恒流放电以及差热分析等方法分析了物理吸附水和化学结构水对于α-PbO2和β-PbO2在放电过程中的还原反应所起的作用。实验证明水的损失直接导致了PbO2容量和电导的下降。当只有物理吸附水被除去时,α-PbO2和β-PbO2的容... 采用循环伏安、恒流放电以及差热分析等方法分析了物理吸附水和化学结构水对于α-PbO2和β-PbO2在放电过程中的还原反应所起的作用。实验证明水的损失直接导致了PbO2容量和电导的下降。当只有物理吸附水被除去时,α-PbO2和β-PbO2的容量损失不大;而化学结构水被除去时,α-PbO2和β-PbO2的容量都衰减很大,而且α-PbO2所受影响更大。对于扩散系数而言,当只有物理吸附水被除去时,β-PbO2的扩散系数变化很小,而α-PbO2的扩散系数下降很大;化学结构水的损失使得β-PbO2的扩散系数变化很大,而α-PbO2的扩散系数变化很小。 展开更多
关键词 铅酸蓄电池 二氧化铅 物理吸附 化学结构水 扩散系数:还原反应:影响
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Rice Husk Ash:A New Silicon Source for Preparing SAPO-34 Catalysts Used in the Methanol-to-Olefins Reaction 被引量:1
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作者 Ma Shoutao Wang Yingjun Ge Dongmei 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2018年第2期65-70,共6页
SAPO-34 molecular sieves were synthesized directly by hydrothermal method with rice husk ash(RHA)used as the silicon source.The crystal structure,composition,surface morphology and acidity of the synthesized products ... SAPO-34 molecular sieves were synthesized directly by hydrothermal method with rice husk ash(RHA)used as the silicon source.The crystal structure,composition,surface morphology and acidity of the synthesized products weresieves had a high crystallinity,without any impure phase.Compared with the SAPO-34 prepared by the silica sol,RHA-SAPO-34 had similar acid properties in strength.The methanol to olefins(MTO)experiments showed that the SAPO-34molecular sieve synthesized from RHA exhibited both a good catalytic activity and ethylene selectivity. 展开更多
关键词 SAPO-34 rice husk ash molecular sieve MTO
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Structural Features of Zooplankton Cenosis of Southern Kazakhstan Surface Waters
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作者 Marat Rashidovich Khanturin Zhanna Khozhanovna Ospanova Akmaral Umirbekovna Isaeva 《Journal of Environmental Science and Engineering(A)》 2012年第2期209-218,共10页
The present condition of Southern Kazakhstan natural reservoirs is represented in the article. The research was held in summer time of 2010. Quantitative and qualitative features and dominating types of zooplankton of... The present condition of Southern Kazakhstan natural reservoirs is represented in the article. The research was held in summer time of 2010. Quantitative and qualitative features and dominating types of zooplankton of the individual reservoirs are shown. It is detected that the waters of the South Kazakhstan oblast (region) are inhabited by 70 types of zooplankton organisms of different taxonomic groups, whose association to certain reservoir depends on the hydrochemical indicators of the aquatic environment. 展开更多
关键词 Hydrobiocoenosis ZOOPLANKTON taxonomical analysis saprobic valence.
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Racemic X-ray structure of L-type calcium channel antagonist Calciseptine prepared by total chemical synthesis 被引量:3
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作者 Chen-Chen Chen Shuai Gao +3 位作者 Hua-Song Ai Qian Qu Chang-Lin Tian Yi-Ming Li 《Science China Chemistry》 SCIE EI CAS CSCD 2018年第6期702-707,共6页
Snake toxin Calciseptine as a natural antagonist of L-type calcium channel has potential drug values, but its structural information remains unknown. Here, we report the total chemical synthesis of Calciseptine by usi... Snake toxin Calciseptine as a natural antagonist of L-type calcium channel has potential drug values, but its structural information remains unknown. Here, we report the total chemical synthesis of Calciseptine by using hydrazide based native chemical ligation. The crystal structure of Calciseptine was determined by racemic protein crystallography technique. Compared to the structure of its homologous family protein, we found that Calciseptine is adopting a typical three-finger structure. 展开更多
关键词 protein chemical synthesis calciseptine hydrazide based native chemical ligation racemic protein crystallography
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Electrochemical water oxidation by photo-deposited cobalt-based catalyst on a nano-structured TiO_(2) electrode 被引量:1
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作者 LI Lin SUN LiCheng 《Science China Chemistry》 SCIE EI CAS 2012年第9期1976-1981,共6页
A cobalt-based catalyst was directly photo-deposited on the surface of a widely used n-type nano-structured semiconductor(TiO_(2)).Different thicknesses of the TiO 2 films as well as different time of photo-deposition... A cobalt-based catalyst was directly photo-deposited on the surface of a widely used n-type nano-structured semiconductor(TiO_(2)).Different thicknesses of the TiO 2 films as well as different time of photo-deposition of the Co-based catalyst on TiO_(2) films have been optimized.It was found that the electrode with 3 layers of TiO_(2) film(in 8 m thickness) and 1 hour photo-deposition of the cobalt-based catalyst by light irradiation from a 500 W Xenon lamp gave the highest current density(~5 mA/cm^(2)).Using this cobalt-modified TiO_(2) film as a working electrode in an electrochemical device,highly efficient water oxidation has been demonstrated in a pH 7.0 aqueous solution with low overpotential. 展开更多
关键词 artificial photosynthesis electrochemical water oxidation cobalt-based catalyst photo-deposition water splitting
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